module BABYLON {
    /** @hidden */
    class _FacetDataStorage {
        // facetData private properties
        public facetPositions: Vector3[];             // facet local positions
        public facetNormals: Vector3[];               // facet local normals
        public facetPartitioning: number[][];         // partitioning array of facet index arrays
        public facetNb: number = 0;                   // facet number
        public partitioningSubdivisions: number = 10; // number of subdivisions per axis in the partioning space
        public partitioningBBoxRatio: number = 1.01;  // the partioning array space is by default 1% bigger than the bounding box
        public facetDataEnabled: boolean = false;     // is the facet data feature enabled on this mesh ?
        public facetParameters: any = {};             // keep a reference to the object parameters to avoid memory re-allocation
        public bbSize: Vector3 = Vector3.Zero();      // bbox size approximated for facet data
        public subDiv = {                             // actual number of subdivisions per axis for ComputeNormals()
            max: 1,
            X: 1,
            Y: 1,
            Z: 1
        };

        public facetDepthSort: boolean = false;                           // is the facet depth sort to be computed
        public facetDepthSortEnabled: boolean = false;                    // is the facet depth sort initialized
        public depthSortedIndices: IndicesArray;                          // copy of the indices array to store them once sorted
        public depthSortedFacets: { ind: number, sqDistance: number }[];    // array of depth sorted facets
        public facetDepthSortFunction: (f1: { ind: number, sqDistance: number }, f2: { ind: number, sqDistance: number }) => number;  // facet depth sort function
        public facetDepthSortFrom: Vector3;                               // location where to depth sort from
        public facetDepthSortOrigin: Vector3;                             // same as facetDepthSortFrom but expressed in the mesh local space

        public invertedMatrix: Matrix; // Inverted world matrix.
    }

    /**
     * Class used to store all common mesh properties
     */
    export class AbstractMesh extends TransformNode implements IDisposable, ICullable, IGetSetVerticesData {
        /** No occlusion */
        public static OCCLUSION_TYPE_NONE = 0;
        /** Occlusion set to optimisitic */
        public static OCCLUSION_TYPE_OPTIMISTIC = 1;
        /** Occlusion set to strict */
        public static OCCLUSION_TYPE_STRICT = 2;
        /** Use an accurante occlusion algorithm */
        public static OCCLUSION_ALGORITHM_TYPE_ACCURATE = 0;
        /** Use a conservative occlusion algorithm */
        public static OCCLUSION_ALGORITHM_TYPE_CONSERVATIVE = 1;

        /** Default culling strategy with bounding box and bounding sphere and then frustum culling */
        public static readonly CULLINGSTRATEGY_STANDARD = 0;
        /** Culling strategy with bounding sphere only and then frustum culling */
        public static readonly CULLINGSTRATEGY_BOUNDINGSPHERE_ONLY = 1;

        /**
         * No billboard
         */
        public static get BILLBOARDMODE_NONE(): number {
            return TransformNode.BILLBOARDMODE_NONE;
        }

        /** Billboard on X axis */
        public static get BILLBOARDMODE_X(): number {
            return TransformNode.BILLBOARDMODE_X;
        }

        /** Billboard on Y axis */
        public static get BILLBOARDMODE_Y(): number {
            return TransformNode.BILLBOARDMODE_Y;
        }

        /** Billboard on Z axis */
        public static get BILLBOARDMODE_Z(): number {
            return TransformNode.BILLBOARDMODE_Z;
        }

        /** Billboard on all axes */
        public static get BILLBOARDMODE_ALL(): number {
            return TransformNode.BILLBOARDMODE_ALL;
        }

        private _facetData = new _FacetDataStorage();

        /** Gets ot sets the culling strategy to use to find visible meshes */
        public cullingStrategy = AbstractMesh.CULLINGSTRATEGY_STANDARD;

        /**
         * Gets the number of facets in the mesh
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata#what-is-a-mesh-facet
         */
        public get facetNb(): number {
            return this._facetData.facetNb;
        }
        /**
         * Gets or set the number (integer) of subdivisions per axis in the partioning space
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata#tweaking-the-partitioning
         */
        public get partitioningSubdivisions(): number {
            return this._facetData.partitioningSubdivisions;
        }
        public set partitioningSubdivisions(nb: number) {
            this._facetData.partitioningSubdivisions = nb;
        }
        /**
         * The ratio (float) to apply to the bouding box size to set to the partioning space.
         * Ex : 1.01 (default) the partioning space is 1% bigger than the bounding box
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata#tweaking-the-partitioning
         */
        public get partitioningBBoxRatio(): number {
            return this._facetData.partitioningBBoxRatio;
        }
        public set partitioningBBoxRatio(ratio: number) {
            this._facetData.partitioningBBoxRatio = ratio;
        }

        /**
         * Gets or sets a boolean indicating that the facets must be depth sorted on next call to `updateFacetData()`.
         * Works only for updatable meshes.
         * Doesn't work with multi-materials
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata#facet-depth-sort
         */
        public get mustDepthSortFacets(): boolean {
            return this._facetData.facetDepthSort;
        }
        public set mustDepthSortFacets(sort: boolean) {
            this._facetData.facetDepthSort = sort;
        }

        /**
         * The location (Vector3) where the facet depth sort must be computed from.
         * By default, the active camera position.
         * Used only when facet depth sort is enabled
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata#facet-depth-sort
         */
        public get facetDepthSortFrom(): Vector3 {
            return this._facetData.facetDepthSortFrom;
        }
        public set facetDepthSortFrom(location: Vector3) {
            this._facetData.facetDepthSortFrom = location;
        }

        /**
         * gets a boolean indicating if facetData is enabled
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata#what-is-a-mesh-facet
         */
        public get isFacetDataEnabled(): boolean {
            return this._facetData.facetDataEnabled;
        }

        /** @hidden */
        public _updateNonUniformScalingState(value: boolean): boolean {
            if (!super._updateNonUniformScalingState(value)) {
                return false;
            }
            this._markSubMeshesAsMiscDirty();
            return true;
        }

        // Events

        /**
        * An event triggered when this mesh collides with another one
        */
        public onCollideObservable = new Observable<AbstractMesh>();

        private _onCollideObserver: Nullable<Observer<AbstractMesh>>;

        /** Set a function to call when this mesh collides with another one */
        public set onCollide(callback: () => void) {
            if (this._onCollideObserver) {
                this.onCollideObservable.remove(this._onCollideObserver);
            }
            this._onCollideObserver = this.onCollideObservable.add(callback);
        }

        /**
        * An event triggered when the collision's position changes
        */
        public onCollisionPositionChangeObservable = new Observable<Vector3>();

        private _onCollisionPositionChangeObserver: Nullable<Observer<Vector3>>;
        /** Set a function to call when the collision's position changes */
        public set onCollisionPositionChange(callback: () => void) {
            if (this._onCollisionPositionChangeObserver) {
                this.onCollisionPositionChangeObservable.remove(this._onCollisionPositionChangeObserver);
            }
            this._onCollisionPositionChangeObserver = this.onCollisionPositionChangeObservable.add(callback);
        }

        /**
        * An event triggered when material is changed
        */
        public onMaterialChangedObservable = new Observable<AbstractMesh>();

        // Properties

        /**
         * Gets or sets the orientation for POV movement & rotation
         */
        public definedFacingForward = true;

        /** @hidden */
        public _occlusionQuery: Nullable<WebGLQuery>;

        private _visibility = 1.0;

        /**
         * Gets or sets mesh visibility between 0 and 1 (default is 1)
         */
        public get visibility(): number {
            return this._visibility;
        }

        /**
         * Gets or sets mesh visibility between 0 and 1 (default is 1)
         */
        public set visibility(value: number) {
            if (this._visibility === value) {
                return;
            }

            this._visibility = value;
            this._markSubMeshesAsMiscDirty();
        }

        /** Gets or sets the alpha index used to sort transparent meshes
         * @see http://doc.babylonjs.com/resources/transparency_and_how_meshes_are_rendered#alpha-index
         */
        public alphaIndex = Number.MAX_VALUE;

        /**
         * Gets or sets a boolean indicating if the mesh is visible (renderable). Default is true
         */
        public isVisible = true;

        /**
         * Gets or sets a boolean indicating if the mesh can be picked (by scene.pick for instance or through actions). Default is true
         */
        public isPickable = true;

        /** Gets or sets a boolean indicating that bounding boxes of subMeshes must be rendered as well (false by default) */
        public showSubMeshesBoundingBox = false;

        /** Gets or sets a boolean indicating if the mesh must be considered as a ray blocker for lens flares (false by default)
         * @see http://doc.babylonjs.com/how_to/how_to_use_lens_flares
         */
        public isBlocker = false;

        /**
         * Gets or sets a boolean indicating that pointer move events must be supported on this mesh (false by default)
         */
        public enablePointerMoveEvents = false;

        /**
         * Specifies the rendering group id for this mesh (0 by default)
         * @see http://doc.babylonjs.com/resources/transparency_and_how_meshes_are_rendered#rendering-groups
         */
        public renderingGroupId = 0;
        private _material: Nullable<Material>;

        /** Gets or sets current material */
        public get material(): Nullable<Material> {
            return this._material;
        }
        public set material(value: Nullable<Material>) {
            if (this._material === value) {
                return;
            }

            // remove from material mesh map id needed
            if (this._material && this._material.meshMap) {
                this._material.meshMap[this.uniqueId] = undefined;
            }

            this._material = value;

            if (value && value.meshMap) {
                value.meshMap[this.uniqueId] = this;
            }

            if (this.onMaterialChangedObservable.hasObservers) {
                this.onMaterialChangedObservable.notifyObservers(this);
            }

            if (!this.subMeshes) {
                return;
            }

            this._unBindEffect();
        }

        private _receiveShadows = false;

        /**
         * Gets or sets a boolean indicating that this mesh can receive realtime shadows
         * @see http://doc.babylonjs.com/babylon101/shadows
         */
        public get receiveShadows(): boolean {
            return this._receiveShadows;
        }
        public set receiveShadows(value: boolean) {
            if (this._receiveShadows === value) {
                return;
            }

            this._receiveShadows = value;
            this._markSubMeshesAsLightDirty();
        }

        /** Defines color to use when rendering outline */
        public outlineColor = Color3.Red();
        /** Define width to use when rendering outline */
        public outlineWidth = 0.02;

        /** Defines color to use when rendering overlay */
        public overlayColor = Color3.Red();
        /** Defines alpha to use when rendering overlay */
        public overlayAlpha = 0.5;

        private _hasVertexAlpha = false;
        /** Gets or sets a boolean indicating that this mesh contains vertex color data with alpha values */
        public get hasVertexAlpha(): boolean {
            return this._hasVertexAlpha;
        }
        public set hasVertexAlpha(value: boolean) {
            if (this._hasVertexAlpha === value) {
                return;
            }

            this._hasVertexAlpha = value;
            this._markSubMeshesAsAttributesDirty();
            this._markSubMeshesAsMiscDirty();
        }

        private _useVertexColors = true;

        /** Gets or sets a boolean indicating that this mesh needs to use vertex color data to render (if this kind of vertex data is available in the geometry) */
        public get useVertexColors(): boolean {
            return this._useVertexColors;
        }
        public set useVertexColors(value: boolean) {
            if (this._useVertexColors === value) {
                return;
            }

            this._useVertexColors = value;
            this._markSubMeshesAsAttributesDirty();
        }

        private _computeBonesUsingShaders = true;
        /**
         * Gets or sets a boolean indicating that bone animations must be computed by the CPU (false by default)
         */
        public get computeBonesUsingShaders(): boolean {
            return this._computeBonesUsingShaders;
        }
        public set computeBonesUsingShaders(value: boolean) {
            if (this._computeBonesUsingShaders === value) {
                return;
            }

            this._computeBonesUsingShaders = value;
            this._markSubMeshesAsAttributesDirty();
        }

        private _numBoneInfluencers = 4;
        /** Gets or sets the number of allowed bone influences per vertex (4 by default) */
        public get numBoneInfluencers(): number {
            return this._numBoneInfluencers;
        }
        public set numBoneInfluencers(value: number) {
            if (this._numBoneInfluencers === value) {
                return;
            }

            this._numBoneInfluencers = value;
            this._markSubMeshesAsAttributesDirty();
        }

        private _applyFog = true;

        /** Gets or sets a boolean indicating that this mesh will allow fog to be rendered on it (true by default) */
        public get applyFog(): boolean {
            return this._applyFog;
        }
        public set applyFog(value: boolean) {
            if (this._applyFog === value) {
                return;
            }

            this._applyFog = value;
            this._markSubMeshesAsMiscDirty();
        }

        /** Gets or sets a boolean indicating that internal octree (if available) can be used to boost submeshes selection (true by default) */
        public useOctreeForRenderingSelection = true;
        /** Gets or sets a boolean indicating that internal octree (if available) can be used to boost submeshes picking (true by default) */
        public useOctreeForPicking = true;
        /** Gets or sets a boolean indicating that internal octree (if available) can be used to boost submeshes collision (true by default) */
        public useOctreeForCollisions = true;

        private _layerMask: number = 0x0FFFFFFF;

        /**
         * Gets or sets the current layer mask (default is 0x0FFFFFFF)
         * @see http://doc.babylonjs.com/how_to/layermasks_and_multi-cam_textures
         */
        public get layerMask(): number {
            return this._layerMask;
        }

        public set layerMask(value: number) {
            if (value === this._layerMask) {
                return;
            }

            this._layerMask = value;
            this._resyncLightSources();
        }

        /**
         * True if the mesh must be rendered in any case (this will shortcut the frustum clipping phase)
         */
        public alwaysSelectAsActiveMesh = false;

        /**
         * Gets or sets the current action manager
         * @see http://doc.babylonjs.com/how_to/how_to_use_actions
         */
        public actionManager: Nullable<ActionManager> = null;

        // Collisions
        private _checkCollisions = false;
        private _collisionMask = -1;
        private _collisionGroup = -1;

        /**
         * Gets or sets the ellipsoid used to impersonate this mesh when using collision engine (default is (0.5, 1, 0.5))
         * @see http://doc.babylonjs.com/babylon101/cameras,_mesh_collisions_and_gravity
         */
        public ellipsoid = new Vector3(0.5, 1, 0.5);
        /**
         * Gets or sets the ellipsoid offset used to impersonate this mesh when using collision engine (default is (0, 0, 0))
         * @see http://doc.babylonjs.com/babylon101/cameras,_mesh_collisions_and_gravity
         */
        public ellipsoidOffset = new Vector3(0, 0, 0);
        private _collider: Collider;
        private _oldPositionForCollisions = new Vector3(0, 0, 0);
        private _diffPositionForCollisions = new Vector3(0, 0, 0);

        /**
         * Gets or sets a collision mask used to mask collisions (default is -1).
         * A collision between A and B will happen if A.collisionGroup & b.collisionMask !== 0
         */
        public get collisionMask(): number {
            return this._collisionMask;
        }

        public set collisionMask(mask: number) {
            this._collisionMask = !isNaN(mask) ? mask : -1;
        }

        /**
         * Gets or sets the current collision group mask (-1 by default).
         * A collision between A and B will happen if A.collisionGroup & b.collisionMask !== 0
         */
        public get collisionGroup(): number {
            return this._collisionGroup;
        }

        public set collisionGroup(mask: number) {
            this._collisionGroup = !isNaN(mask) ? mask : -1;
        }

        // Edges
        /**
         * Defines edge width used when edgesRenderer is enabled
         * @see https://www.babylonjs-playground.com/#10OJSG#13
         */
        public edgesWidth = 1;
        /**
         * Defines edge color used when edgesRenderer is enabled
         * @see https://www.babylonjs-playground.com/#10OJSG#13
         */
        public edgesColor = new Color4(1, 0, 0, 1);
        /** @hidden */
        public _edgesRenderer: Nullable<IEdgesRenderer>;

        /** @hidden */
        public _masterMesh: Nullable<AbstractMesh>;
        /** @hidden */
        public _boundingInfo: Nullable<BoundingInfo>;
        /** @hidden */
        public _renderId = 0;

        /**
         * Gets or sets the list of subMeshes
         * @see http://doc.babylonjs.com/how_to/multi_materials
         */
        public subMeshes: SubMesh[];

        /** @hidden */
        public _intersectionsInProgress = new Array<AbstractMesh>();

        /** @hidden */
        public _unIndexed = false;

        /** @hidden */
        public _lightSources = new Array<Light>();

        /** @hidden */
        public get _positions(): Nullable<Vector3[]> {
            return null;
        }

        // Loading properties
        /** @hidden */
        public _waitingActions: any;
        /** @hidden */
        public _waitingFreezeWorldMatrix: Nullable<boolean>;

        // Skeleton
        private _skeleton: Nullable<Skeleton>;
        /** @hidden */
        public _bonesTransformMatrices: Nullable<Float32Array>;

        /**
         * Gets or sets a skeleton to apply skining transformations
         * @see http://doc.babylonjs.com/how_to/how_to_use_bones_and_skeletons
         */
        public set skeleton(value: Nullable<Skeleton>) {
            if (this._skeleton && this._skeleton.needInitialSkinMatrix) {
                this._skeleton._unregisterMeshWithPoseMatrix(this);
            }

            if (value && value.needInitialSkinMatrix) {
                value._registerMeshWithPoseMatrix(this);
            }

            this._skeleton = value;

            if (!this._skeleton) {
                this._bonesTransformMatrices = null;
            }

            this._markSubMeshesAsAttributesDirty();
        }

        public get skeleton(): Nullable<Skeleton> {
            return this._skeleton;
        }

        /**
         * An event triggered when the mesh is rebuilt.
         */
        public onRebuildObservable = new Observable<AbstractMesh>();

        // Constructor

        /**
         * Creates a new AbstractMesh
         * @param name defines the name of the mesh
         * @param scene defines the hosting scene
         */
        constructor(name: string, scene: Nullable<Scene> = null) {
            super(name, scene, false);

            this.getScene().addMesh(this);

            this._resyncLightSources();
        }

        /**
         * Returns the string "AbstractMesh"
         * @returns "AbstractMesh"
         */
        public getClassName(): string {
            return "AbstractMesh";
        }

        /**
         * Gets a string representation of the current mesh
         * @param fullDetails defines a boolean indicating if full details must be included
         * @returns a string representation of the current mesh
         */
        public toString(fullDetails?: boolean): string {
            var ret = "Name: " + this.name + ", isInstance: " + (this instanceof InstancedMesh ? "YES" : "NO");
            ret += ", # of submeshes: " + (this.subMeshes ? this.subMeshes.length : 0);
            if (this._skeleton) {
                ret += ", skeleton: " + this._skeleton.name;
            }
            if (fullDetails) {
                ret += ", billboard mode: " + (["NONE", "X", "Y", null, "Z", null, null, "ALL"])[this.billboardMode];
                ret += ", freeze wrld mat: " + (this._isWorldMatrixFrozen || this._waitingFreezeWorldMatrix ? "YES" : "NO");
            }
            return ret;
        }

        /** @hidden */
        public _rebuild(): void {
            this.onRebuildObservable.notifyObservers(this);

            if (this._occlusionQuery) {
                this._occlusionQuery = null;
            }

            if (!this.subMeshes) {
                return;
            }

            for (var subMesh of this.subMeshes) {
                subMesh._rebuild();
            }
        }

        /** @hidden */
        public _resyncLightSources(): void {
            this._lightSources.length = 0;

            for (var light of this.getScene().lights) {
                if (!light.isEnabled()) {
                    continue;
                }

                if (light.canAffectMesh(this)) {
                    this._lightSources.push(light);
                }
            }

            this._markSubMeshesAsLightDirty();
        }

        /** @hidden */
        public _resyncLighSource(light: Light): void {
            var isIn = light.isEnabled() && light.canAffectMesh(this);

            var index = this._lightSources.indexOf(light);

            if (index === -1) {
                if (!isIn) {
                    return;
                }
                this._lightSources.push(light);
            } else {
                if (isIn) {
                    return;
                }
                this._lightSources.splice(index, 1);
            }

            this._markSubMeshesAsLightDirty();
        }

        /** @hidden */
        public _unBindEffect() {
            for (var subMesh of this.subMeshes) {
                subMesh.setEffect(null);
            }
        }

        /** @hidden */
        public _removeLightSource(light: Light): void {
            var index = this._lightSources.indexOf(light);

            if (index === -1) {
                return;
            }
            this._lightSources.splice(index, 1);

            this._markSubMeshesAsLightDirty();
        }

        private _markSubMeshesAsDirty(func: (defines: MaterialDefines) => void) {
            if (!this.subMeshes) {
                return;
            }

            for (var subMesh of this.subMeshes) {
                if (subMesh._materialDefines) {
                    func(subMesh._materialDefines);
                }
            }
        }

        /** @hidden */
        public _markSubMeshesAsLightDirty() {
            this._markSubMeshesAsDirty((defines) => defines.markAsLightDirty());
        }

        /** @hidden */
        public _markSubMeshesAsAttributesDirty() {
            this._markSubMeshesAsDirty((defines) => defines.markAsAttributesDirty());
        }

        /** @hidden */
        public _markSubMeshesAsMiscDirty() {
            if (!this.subMeshes) {
                return;
            }

            for (var subMesh of this.subMeshes) {
                var material = subMesh.getMaterial();
                if (material) {
                    material.markAsDirty(Material.MiscDirtyFlag);
                }
            }
        }

        /**
        * Gets or sets a Vector3 depicting the mesh scaling along each local axis X, Y, Z.  Default is (1.0, 1.0, 1.0)
        */
        public get scaling(): Vector3 {
            return this._scaling;
        }

        public set scaling(newScaling: Vector3) {
            this._scaling = newScaling;
            if (this.physicsImpostor) {
                this.physicsImpostor.forceUpdate();
            }
        }

        // Methods
        /**
         * Returns true if the mesh is blocked. Implemented by child classes
         */
        public get isBlocked(): boolean {
            return false;
        }

        /**
         * Returns the mesh itself by default. Implemented by child classes
         * @param camera defines the camera to use to pick the right LOD level
         * @returns the currentAbstractMesh
         */
        public getLOD(camera: Camera): Nullable<AbstractMesh> {
            return this;
        }

        /**
         * Returns 0 by default. Implemented by child classes
         * @returns an integer
         */
        public getTotalVertices(): number {
            return 0;
        }

        /**
         * Returns null by default. Implemented by child classes
         * @returns null
         */
        public getIndices(): Nullable<IndicesArray> {
            return null;
        }

        /**
         * Returns the array of the requested vertex data kind. Implemented by child classes
         * @param kind defines the vertex data kind to use
         * @returns null
         */
        public getVerticesData(kind: string): Nullable<FloatArray> {
            return null;
        }

        /**
         * Sets the vertex data of the mesh geometry for the requested `kind`.
         * If the mesh has no geometry, a new Geometry object is set to the mesh and then passed this vertex data.
         * Note that a new underlying VertexBuffer object is created each call.
         * If the `kind` is the `PositionKind`, the mesh BoundingInfo is renewed, so the bounding box and sphere, and the mesh World Matrix is recomputed.
         * @param kind defines vertex data kind:
         * * BABYLON.VertexBuffer.PositionKind
         * * BABYLON.VertexBuffer.UVKind
         * * BABYLON.VertexBuffer.UV2Kind
         * * BABYLON.VertexBuffer.UV3Kind
         * * BABYLON.VertexBuffer.UV4Kind
         * * BABYLON.VertexBuffer.UV5Kind
         * * BABYLON.VertexBuffer.UV6Kind
         * * BABYLON.VertexBuffer.ColorKind
         * * BABYLON.VertexBuffer.MatricesIndicesKind
         * * BABYLON.VertexBuffer.MatricesIndicesExtraKind
         * * BABYLON.VertexBuffer.MatricesWeightsKind
         * * BABYLON.VertexBuffer.MatricesWeightsExtraKind
         * @param data defines the data source
         * @param updatable defines if the data must be flagged as updatable (or static)
         * @param stride defines the vertex stride (size of an entire vertex). Can be null and in this case will be deduced from vertex data kind
         * @returns the current mesh
         */
        public setVerticesData(kind: string, data: FloatArray, updatable?: boolean, stride?: number): AbstractMesh {
            return this;
        }

        /**
         * Updates the existing vertex data of the mesh geometry for the requested `kind`.
         * If the mesh has no geometry, it is simply returned as it is.
         * @param kind defines vertex data kind:
         * * BABYLON.VertexBuffer.PositionKind
         * * BABYLON.VertexBuffer.UVKind
         * * BABYLON.VertexBuffer.UV2Kind
         * * BABYLON.VertexBuffer.UV3Kind
         * * BABYLON.VertexBuffer.UV4Kind
         * * BABYLON.VertexBuffer.UV5Kind
         * * BABYLON.VertexBuffer.UV6Kind
         * * BABYLON.VertexBuffer.ColorKind
         * * BABYLON.VertexBuffer.MatricesIndicesKind
         * * BABYLON.VertexBuffer.MatricesIndicesExtraKind
         * * BABYLON.VertexBuffer.MatricesWeightsKind
         * * BABYLON.VertexBuffer.MatricesWeightsExtraKind
         * @param data defines the data source
         * @param updateExtends If `kind` is `PositionKind` and if `updateExtends` is true, the mesh BoundingInfo is renewed, so the bounding box and sphere, and the mesh World Matrix is recomputed
         * @param makeItUnique If true, a new global geometry is created from this data and is set to the mesh
         * @returns the current mesh
         */
        public updateVerticesData(kind: string, data: FloatArray, updateExtends?: boolean, makeItUnique?: boolean): AbstractMesh {
            return this;
        }

        /**
         * Sets the mesh indices,
         * If the mesh has no geometry, a new Geometry object is created and set to the mesh.
         * @param indices Expects an array populated with integers or a typed array (Int32Array, Uint32Array, Uint16Array)
         * @param totalVertices Defines the total number of vertices
         * @returns the current mesh
         */
        public setIndices(indices: IndicesArray, totalVertices: Nullable<number>): AbstractMesh {
            return this;
        }

        /**
         * Gets a boolean indicating if specific vertex data is present
         * @param kind defines the vertex data kind to use
         * @returns true is data kind is present
         */
        public isVerticesDataPresent(kind: string): boolean {
            return false;
        }

        /**
         * Returns the mesh BoundingInfo object or creates a new one and returns if it was undefined
         * @returns a BoundingInfo
         */
        public getBoundingInfo(): BoundingInfo {
            if (this._masterMesh) {
                return this._masterMesh.getBoundingInfo();
            }

            if (!this._boundingInfo) {
                // this._boundingInfo is being created here
                this._updateBoundingInfo();
            }
            // cannot be null.
            return this._boundingInfo!;
        }

        /**
         * Uniformly scales the mesh to fit inside of a unit cube (1 X 1 X 1 units)
         * @param includeDescendants Use the hierarchy's bounding box instead of the mesh's bounding box
         * @returns the current mesh
         */
        public normalizeToUnitCube(includeDescendants = true): AbstractMesh {
            let boundingVectors = this.getHierarchyBoundingVectors(includeDescendants);
            let sizeVec = boundingVectors.max.subtract(boundingVectors.min);
            let maxDimension = Math.max(sizeVec.x, sizeVec.y, sizeVec.z);

            if (maxDimension === 0) {
                return this;
            }

            let scale = 1 / maxDimension;

            this.scaling.scaleInPlace(scale);

            return this;
        }

        /**
         * Overwrite the current bounding info
         * @param boundingInfo defines the new bounding info
         * @returns the current mesh
         */
        public setBoundingInfo(boundingInfo: BoundingInfo): AbstractMesh {
            this._boundingInfo = boundingInfo;
            return this;
        }

        /** Gets a boolean indicating if this mesh has skinning data and an attached skeleton */
        public get useBones(): boolean {
            return (<boolean>(this.skeleton && this.getScene().skeletonsEnabled && this.isVerticesDataPresent(VertexBuffer.MatricesIndicesKind) && this.isVerticesDataPresent(VertexBuffer.MatricesWeightsKind)));
        }

        /** @hidden */
        public _preActivate(): void {
        }

        /** @hidden */
        public _preActivateForIntermediateRendering(renderId: number): void {
        }

        /** @hidden */
        public _activate(renderId: number): void {
            this._renderId = renderId;
        }

        /**
         * Gets the current world matrix
         * @returns a Matrix
         */
        public getWorldMatrix(): Matrix {
            if (this._masterMesh) {
                return this._masterMesh.getWorldMatrix();
            }

            return super.getWorldMatrix();
        }

        /** @hidden */
        public _getWorldMatrixDeterminant(): number {
            if (this._masterMesh) {
                return this._masterMesh._getWorldMatrixDeterminant();
            }

            return super._getWorldMatrixDeterminant();
        }

        // ================================== Point of View Movement =================================

        /**
         * Perform relative position change from the point of view of behind the front of the mesh.
         * This is performed taking into account the meshes current rotation, so you do not have to care.
         * Supports definition of mesh facing forward or backward
         * @param amountRight defines the distance on the right axis
         * @param amountUp defines the distance on the up axis
         * @param amountForward defines the distance on the forward axis
         * @returns the current mesh
         */
        public movePOV(amountRight: number, amountUp: number, amountForward: number): AbstractMesh {
            this.position.addInPlace(this.calcMovePOV(amountRight, amountUp, amountForward));
            return this;
        }

        /**
         * Calculate relative position change from the point of view of behind the front of the mesh.
         * This is performed taking into account the meshes current rotation, so you do not have to care.
         * Supports definition of mesh facing forward or backward
         * @param amountRight defines the distance on the right axis
         * @param amountUp defines the distance on the up axis
         * @param amountForward defines the distance on the forward axis
         * @returns the new displacement vector
         */
        public calcMovePOV(amountRight: number, amountUp: number, amountForward: number): Vector3 {
            var rotMatrix = new Matrix();
            var rotQuaternion = (this.rotationQuaternion) ? this.rotationQuaternion : Quaternion.RotationYawPitchRoll(this.rotation.y, this.rotation.x, this.rotation.z);
            rotQuaternion.toRotationMatrix(rotMatrix);

            var translationDelta = Vector3.Zero();
            var defForwardMult = this.definedFacingForward ? -1 : 1;
            Vector3.TransformCoordinatesFromFloatsToRef(amountRight * defForwardMult, amountUp, amountForward * defForwardMult, rotMatrix, translationDelta);
            return translationDelta;
        }
        // ================================== Point of View Rotation =================================
        /**
         * Perform relative rotation change from the point of view of behind the front of the mesh.
         * Supports definition of mesh facing forward or backward
         * @param flipBack defines the flip
         * @param twirlClockwise defines the twirl
         * @param tiltRight defines the tilt
         * @returns the current mesh
         */
        public rotatePOV(flipBack: number, twirlClockwise: number, tiltRight: number): AbstractMesh {
            this.rotation.addInPlace(this.calcRotatePOV(flipBack, twirlClockwise, tiltRight));
            return this;
        }

        /**
         * Calculate relative rotation change from the point of view of behind the front of the mesh.
         * Supports definition of mesh facing forward or backward.
         * @param flipBack defines the flip
         * @param twirlClockwise defines the twirl
         * @param tiltRight defines the tilt
         * @returns the new rotation vector
         */
        public calcRotatePOV(flipBack: number, twirlClockwise: number, tiltRight: number): Vector3 {
            var defForwardMult = this.definedFacingForward ? 1 : -1;
            return new Vector3(flipBack * defForwardMult, twirlClockwise, tiltRight * defForwardMult);
        }

        /**
         * Return the minimum and maximum world vectors of the entire hierarchy under current mesh
         * @param includeDescendants Include bounding info from descendants as well (true by default)
         * @param predicate defines a callback function that can be customize to filter what meshes should be included in the list used to compute the bounding vectors
         * @returns the new bounding vectors
         */
        public getHierarchyBoundingVectors(includeDescendants = true, predicate: Nullable<(abstractMesh: AbstractMesh) => boolean> = null): { min: Vector3, max: Vector3 } {
            // Ensures that all world matrix will be recomputed.
            this.getScene().incrementRenderId();

            this.computeWorldMatrix(true);

            let min: Vector3;
            let max: Vector3;
            let boundingInfo = this.getBoundingInfo();

            if (!this.subMeshes) {
                min = new Vector3(Number.MAX_VALUE, Number.MAX_VALUE, Number.MAX_VALUE);
                max = new Vector3(-Number.MAX_VALUE, -Number.MAX_VALUE, -Number.MAX_VALUE);
            } else {
                min = boundingInfo.boundingBox.minimumWorld;
                max = boundingInfo.boundingBox.maximumWorld;
            }

            if (includeDescendants) {
                let descendants = this.getDescendants(false);

                for (var descendant of descendants) {
                    let childMesh = <AbstractMesh>descendant;
                    childMesh.computeWorldMatrix(true);

                    // Filters meshes based on custom predicate function.
                    if (predicate && !predicate(childMesh)) {
                        continue;
                    }

                    //make sure we have the needed params to get mix and max
                    if (!childMesh.getBoundingInfo || childMesh.getTotalVertices() === 0) {
                        continue;
                    }

                    let childBoundingInfo = childMesh.getBoundingInfo();
                    let boundingBox = childBoundingInfo.boundingBox;

                    var minBox = boundingBox.minimumWorld;
                    var maxBox = boundingBox.maximumWorld;

                    Tools.CheckExtends(minBox, min, max);
                    Tools.CheckExtends(maxBox, min, max);
                }
            }

            return {
                min: min,
                max: max
            };
        }

        /** @hidden */
        public _updateBoundingInfo(): AbstractMesh {
            if (this._boundingInfo) {
                this._boundingInfo.update(this.worldMatrixFromCache);
            }
            else {
                this._boundingInfo = new BoundingInfo(this.absolutePosition, this.absolutePosition, this.worldMatrixFromCache);
            }
            this._updateSubMeshesBoundingInfo(this.worldMatrixFromCache);
            return this;
        }

        /** @hidden */
        public _updateSubMeshesBoundingInfo(matrix: Matrix): AbstractMesh {
            if (!this.subMeshes) {
                return this;
            }
            let count = this.subMeshes.length;
            for (var subIndex = 0; subIndex < count; subIndex++) {
                var subMesh = this.subMeshes[subIndex];
                if (count > 1 || !subMesh.IsGlobal) {
                    subMesh.updateBoundingInfo(matrix);
                }
            }
            return this;
        }

        /** @hidden */
        protected _afterComputeWorldMatrix(): void {
            // Bounding info
            this._updateBoundingInfo();
        }

        /**
         * Returns `true` if the mesh is within the frustum defined by the passed array of planes.
         * A mesh is in the frustum if its bounding box intersects the frustum
         * @param frustumPlanes defines the frustum to test
         * @returns true if the mesh is in the frustum planes
         */
        public isInFrustum(frustumPlanes: Plane[]): boolean {
            return this._boundingInfo !== null && this._boundingInfo.isInFrustum(frustumPlanes, this.cullingStrategy);
        }

        /**
         * Returns `true` if the mesh is completely in the frustum defined be the passed array of planes.
         * A mesh is completely in the frustum if its bounding box it completely inside the frustum.
         * @param frustumPlanes defines the frustum to test
         * @returns true if the mesh is completely in the frustum planes
         */
        public isCompletelyInFrustum(frustumPlanes: Plane[]): boolean {
            return this._boundingInfo !== null && this._boundingInfo.isCompletelyInFrustum(frustumPlanes);
        }

        /**
         * True if the mesh intersects another mesh or a SolidParticle object
         * @param mesh defines a target mesh or SolidParticle to test
         * @param precise Unless the parameter `precise` is set to `true` the intersection is computed according to Axis Aligned Bounding Boxes (AABB), else according to OBB (Oriented BBoxes)
         * @param includeDescendants Can be set to true to test if the mesh defined in parameters intersects with the current mesh or any child meshes
         * @returns true if there is an intersection
         */
        public intersectsMesh(mesh: AbstractMesh | SolidParticle, precise: boolean = false, includeDescendants?: boolean): boolean {
            if (!this._boundingInfo || !mesh._boundingInfo) {
                return false;
            }

            if (this._boundingInfo.intersects(mesh._boundingInfo, precise)) {
                return true;
            }

            if (includeDescendants) {
                for (var child of this.getChildMeshes()) {
                    if (child.intersectsMesh(mesh, precise, true)) {
                        return true;
                    }
                }
            }

            return false;
        }

        /**
         * Returns true if the passed point (Vector3) is inside the mesh bounding box
         * @param point defines the point to test
         * @returns true if there is an intersection
         */
        public intersectsPoint(point: Vector3): boolean {
            if (!this._boundingInfo) {
                return false;
            }

            return this._boundingInfo.intersectsPoint(point);
        }

        /**
         * Gets the position of the current mesh in camera space
         * @param camera defines the camera to use
         * @returns a position
         */
        public getPositionInCameraSpace(camera: Nullable<Camera> = null): Vector3 {
            if (!camera) {
                camera = (<Camera>this.getScene().activeCamera);
            }

            return Vector3.TransformCoordinates(this.absolutePosition, camera.getViewMatrix());
        }

        /**
         * Returns the distance from the mesh to the active camera
         * @param camera defines the camera to use
         * @returns the distance
         */
        public getDistanceToCamera(camera: Nullable<Camera> = null): number {
            if (!camera) {
                camera = (<Camera>this.getScene().activeCamera);
            }
            return this.absolutePosition.subtract(camera.position).length();
        }

        // Collisions

        /**
         * Gets or sets a boolean indicating that this mesh can be used in the collision engine
         * @see http://doc.babylonjs.com/babylon101/cameras,_mesh_collisions_and_gravity
         */
        public get checkCollisions(): boolean {
            return this._checkCollisions;
        }

        public set checkCollisions(collisionEnabled: boolean) {
            this._checkCollisions = collisionEnabled;
            if (this.getScene().workerCollisions) {
                this.getScene().collisionCoordinator.onMeshUpdated(this);
            }
        }

        /**
         * Gets Collider object used to compute collisions (not physics)
         * @see http://doc.babylonjs.com/babylon101/cameras,_mesh_collisions_and_gravity
         */
        public get collider(): Collider {
            return this._collider;
        }

        /**
         * Move the mesh using collision engine
         * @see http://doc.babylonjs.com/babylon101/cameras,_mesh_collisions_and_gravity
         * @param displacement defines the requested displacement vector
         * @returns the current mesh
         */
        public moveWithCollisions(displacement: Vector3): AbstractMesh {
            var globalPosition = this.getAbsolutePosition();

            globalPosition.addToRef(this.ellipsoidOffset, this._oldPositionForCollisions);

            if (!this._collider) {
                this._collider = new Collider();
            }

            this._collider._radius = this.ellipsoid;

            this.getScene().collisionCoordinator.getNewPosition(this._oldPositionForCollisions, displacement, this._collider, 3, this, this._onCollisionPositionChange, this.uniqueId);
            return this;
        }

        private _onCollisionPositionChange = (collisionId: number, newPosition: Vector3, collidedMesh: Nullable<AbstractMesh> = null) => {
            //TODO move this to the collision coordinator!
            if (this.getScene().workerCollisions) {
                newPosition.multiplyInPlace(this._collider._radius);
            }

            newPosition.subtractToRef(this._oldPositionForCollisions, this._diffPositionForCollisions);

            if (this._diffPositionForCollisions.length() > Engine.CollisionsEpsilon) {
                this.position.addInPlace(this._diffPositionForCollisions);
            }

            if (collidedMesh) {
                this.onCollideObservable.notifyObservers(collidedMesh);
            }

            this.onCollisionPositionChangeObservable.notifyObservers(this.position);
        }

        // Collisions
        /** @hidden */
        public _collideForSubMesh(subMesh: SubMesh, transformMatrix: Matrix, collider: Collider): AbstractMesh {
            this._generatePointsArray();

            if (!this._positions) {
                return this;
            }

            // Transformation
            if (!subMesh._lastColliderWorldVertices || !subMesh._lastColliderTransformMatrix.equals(transformMatrix)) {
                subMesh._lastColliderTransformMatrix = transformMatrix.clone();
                subMesh._lastColliderWorldVertices = [];
                subMesh._trianglePlanes = [];
                var start = subMesh.verticesStart;
                var end = (subMesh.verticesStart + subMesh.verticesCount);
                for (var i = start; i < end; i++) {
                    subMesh._lastColliderWorldVertices.push(Vector3.TransformCoordinates(this._positions[i], transformMatrix));
                }
            }
            // Collide
            collider._collide(subMesh._trianglePlanes, subMesh._lastColliderWorldVertices, (<IndicesArray>this.getIndices()), subMesh.indexStart, subMesh.indexStart + subMesh.indexCount, subMesh.verticesStart, !!subMesh.getMaterial());
            if (collider.collisionFound) {
                collider.collidedMesh = this;
            }
            return this;
        }

        /** @hidden */
        public _processCollisionsForSubMeshes(collider: Collider, transformMatrix: Matrix): AbstractMesh {
            const subMeshes = this._scene.getCollidingSubMeshCandidates(this, collider);
            const len = subMeshes.length;

            for (var index = 0; index < len; index++) {
                var subMesh = subMeshes.data[index];

                // Bounding test
                if (len > 1 && !subMesh._checkCollision(collider)) {
                    continue;
                }

                this._collideForSubMesh(subMesh, transformMatrix, collider);
            }
            return this;
        }

        /** @hidden */
        public _checkCollision(collider: Collider): AbstractMesh {
            // Bounding box test
            if (!this._boundingInfo || !this._boundingInfo._checkCollision(collider)) {
                return this;
            }

            // Transformation matrix
            const collisionsScalingMatrix = Tmp.Matrix[0];
            const collisionsTransformMatrix = Tmp.Matrix[1];
            Matrix.ScalingToRef(1.0 / collider._radius.x, 1.0 / collider._radius.y, 1.0 / collider._radius.z, collisionsScalingMatrix);
            this.worldMatrixFromCache.multiplyToRef(collisionsScalingMatrix, collisionsTransformMatrix);
            this._processCollisionsForSubMeshes(collider, collisionsTransformMatrix);
            return this;
        }

        // Picking
        /** @hidden */
        public _generatePointsArray(): boolean {
            return false;
        }

        /**
         * Checks if the passed Ray intersects with the mesh
         * @param ray defines the ray to use
         * @param fastCheck defines if fast mode (but less precise) must be used (false by default)
         * @returns the picking info
         * @see http://doc.babylonjs.com/babylon101/intersect_collisions_-_mesh
         */
        public intersects(ray: Ray, fastCheck?: boolean): PickingInfo {
            var pickingInfo = new PickingInfo();

            if (!this.subMeshes || !this._boundingInfo || !ray.intersectsSphere(this._boundingInfo.boundingSphere) || !ray.intersectsBox(this._boundingInfo.boundingBox)) {
                return pickingInfo;
            }

            if (!this._generatePointsArray()) {
                return pickingInfo;
            }

            var intersectInfo: Nullable<IntersectionInfo> = null;

            var subMeshes = this._scene.getIntersectingSubMeshCandidates(this, ray);
            var len: number = subMeshes.length;
            for (var index = 0; index < len; index++) {
                var subMesh = subMeshes.data[index];

                // Bounding test
                if (len > 1 && !subMesh.canIntersects(ray)) {
                    continue;
                }

                var currentIntersectInfo = subMesh.intersects(ray, (<Vector3[]>this._positions), (<IndicesArray>this.getIndices()), fastCheck);

                if (currentIntersectInfo) {
                    if (fastCheck || !intersectInfo || currentIntersectInfo.distance < intersectInfo.distance) {
                        intersectInfo = currentIntersectInfo;
                        intersectInfo.subMeshId = index;

                        if (fastCheck) {
                            break;
                        }
                    }
                }
            }

            if (intersectInfo) {
                // Get picked point
                var world = this.getWorldMatrix();
                var worldOrigin = Vector3.TransformCoordinates(ray.origin, world);
                var direction = ray.direction.clone();
                direction = direction.scale(intersectInfo.distance);
                var worldDirection = Vector3.TransformNormal(direction, world);

                var pickedPoint = worldOrigin.add(worldDirection);

                // Return result
                pickingInfo.hit = true;
                pickingInfo.distance = Vector3.Distance(worldOrigin, pickedPoint);
                pickingInfo.pickedPoint = pickedPoint;
                pickingInfo.pickedMesh = this;
                pickingInfo.bu = intersectInfo.bu || 0;
                pickingInfo.bv = intersectInfo.bv || 0;
                pickingInfo.faceId = intersectInfo.faceId;
                pickingInfo.subMeshId = intersectInfo.subMeshId;
                return pickingInfo;
            }

            return pickingInfo;
        }

        /**
         * Clones the current mesh
         * @param name defines the mesh name
         * @param newParent defines the new mesh parent
         * @param doNotCloneChildren defines a boolean indicating that children must not be cloned (false by default)
         * @returns the new mesh
         */
        public clone(name: string, newParent: Node, doNotCloneChildren?: boolean): Nullable<AbstractMesh> {
            return null;
        }

        /**
         * Disposes all the submeshes of the current meshnp
         * @returns the current mesh
         */
        public releaseSubMeshes(): AbstractMesh {
            if (this.subMeshes) {
                while (this.subMeshes.length) {
                    this.subMeshes[0].dispose();
                }
            } else {
                this.subMeshes = new Array<SubMesh>();
            }
            return this;
        }

        /**
         * Releases resources associated with this abstract mesh.
         * @param doNotRecurse Set to true to not recurse into each children (recurse into each children by default)
         * @param disposeMaterialAndTextures Set to true to also dispose referenced materials and textures (false by default)
         */
        public dispose(doNotRecurse?: boolean, disposeMaterialAndTextures = false): void {
            var index: number;

            // Smart Array Retainers.
            this.getScene().freeActiveMeshes();
            this.getScene().freeRenderingGroups();

            // Action manager
            if (this.actionManager !== undefined && this.actionManager !== null) {
                this.actionManager.dispose();
                this.actionManager = null;
            }

            // Skeleton
            this._skeleton = null;

            // Intersections in progress
            for (index = 0; index < this._intersectionsInProgress.length; index++) {
                var other = this._intersectionsInProgress[index];

                var pos = other._intersectionsInProgress.indexOf(this);
                other._intersectionsInProgress.splice(pos, 1);
            }

            this._intersectionsInProgress = [];

            // Lights
            var lights = this.getScene().lights;

            lights.forEach((light: Light) => {
                var meshIndex = light.includedOnlyMeshes.indexOf(this);

                if (meshIndex !== -1) {
                    light.includedOnlyMeshes.splice(meshIndex, 1);
                }

                meshIndex = light.excludedMeshes.indexOf(this);

                if (meshIndex !== -1) {
                    light.excludedMeshes.splice(meshIndex, 1);
                }

                // Shadow generators
                var generator = light.getShadowGenerator();
                if (generator) {
                    var shadowMap = generator.getShadowMap();

                    if (shadowMap && shadowMap.renderList) {
                        meshIndex = shadowMap.renderList.indexOf(this);

                        if (meshIndex !== -1) {
                            shadowMap.renderList.splice(meshIndex, 1);
                        }
                    }
                }
            });

            // SubMeshes
            if (this.getClassName() !== "InstancedMesh") {
                this.releaseSubMeshes();
            }

            // Query
            let engine = this.getScene().getEngine();
            if (this._occlusionQuery) {
                this.isOcclusionQueryInProgress = false;
                engine.deleteQuery(this._occlusionQuery);
                this._occlusionQuery = null;
            }

            // Engine
            engine.wipeCaches();

            // Remove from scene
            this.getScene().removeMesh(this);

            if (disposeMaterialAndTextures) {
                if (this.material) {
                    this.material.dispose(false, true);
                }
            }

            if (!doNotRecurse) {
                // Particles
                for (index = 0; index < this.getScene().particleSystems.length; index++) {
                    if (this.getScene().particleSystems[index].emitter === this) {
                        this.getScene().particleSystems[index].dispose();
                        index--;
                    }
                }
            }

            // facet data
            if (this._facetData.facetDataEnabled) {
                this.disableFacetData();
            }

            this.onAfterWorldMatrixUpdateObservable.clear();
            this.onCollideObservable.clear();
            this.onCollisionPositionChangeObservable.clear();
            this.onRebuildObservable.clear();

            super.dispose(doNotRecurse, disposeMaterialAndTextures);
        }

        /**
         * Adds the passed mesh as a child to the current mesh
         * @param mesh defines the child mesh
         * @returns the current mesh
         */
        public addChild(mesh: AbstractMesh): AbstractMesh {
            mesh.setParent(this);
            return this;
        }

        /**
         * Removes the passed mesh from the current mesh children list
         * @param mesh defines the child mesh
         * @returns the current mesh
         */
        public removeChild(mesh: AbstractMesh): AbstractMesh {
            mesh.setParent(null);
            return this;
        }

        // Facet data
        /** @hidden */
        private _initFacetData(): AbstractMesh {
            const data = this._facetData;
            if (!data.facetNormals) {
                data.facetNormals = new Array<Vector3>();
            }
            if (!data.facetPositions) {
                data.facetPositions = new Array<Vector3>();
            }
            if (!data.facetPartitioning) {
                data.facetPartitioning = new Array<number[]>();
            }
            data.facetNb = ((<IndicesArray>this.getIndices()).length / 3) | 0;
            data.partitioningSubdivisions = (data.partitioningSubdivisions) ? data.partitioningSubdivisions : 10;   // default nb of partitioning subdivisions = 10
            data.partitioningBBoxRatio = (data.partitioningBBoxRatio) ? data.partitioningBBoxRatio : 1.01;          // default ratio 1.01 = the partitioning is 1% bigger than the bounding box
            for (var f = 0; f < data.facetNb; f++) {
                data.facetNormals[f] = Vector3.Zero();
                data.facetPositions[f] = Vector3.Zero();
            }
            data.facetDataEnabled = true;
            return this;
        }

        /**
         * Updates the mesh facetData arrays and the internal partitioning when the mesh is morphed or updated.
         * This method can be called within the render loop.
         * You don't need to call this method by yourself in the render loop when you update/morph a mesh with the methods CreateXXX() as they automatically manage this computation
         * @returns the current mesh
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata
         */
        public updateFacetData(): AbstractMesh {
            const data = this._facetData;
            if (!data.facetDataEnabled) {
                this._initFacetData();
            }
            var positions = this.getVerticesData(VertexBuffer.PositionKind);
            var indices = this.getIndices();
            var normals = this.getVerticesData(VertexBuffer.NormalKind);
            var bInfo = this.getBoundingInfo();

            if (data.facetDepthSort && !data.facetDepthSortEnabled) {
                // init arrays, matrix and sort function on first call
                data.facetDepthSortEnabled = true;
                if (indices instanceof Uint16Array) {
                    data.depthSortedIndices = new Uint16Array(indices!);
                }
                else if (indices instanceof Uint32Array) {
                    data.depthSortedIndices = new Uint32Array(indices!);
                }
                else {
                    var needs32bits = false;
                    for (var i = 0; i < indices!.length; i++) {
                        if (indices![i] > 65535) {
                            needs32bits = true;
                            break;
                        }
                    }
                    if (needs32bits) {
                        data.depthSortedIndices = new Uint32Array(indices!);
                    }
                    else {
                        data.depthSortedIndices = new Uint16Array(indices!);
                    }
                }
                data.facetDepthSortFunction = function(f1, f2) {
                    return (f2.sqDistance - f1.sqDistance);
                };
                if (!data.facetDepthSortFrom) {
                    var camera = this.getScene().activeCamera;
                    data.facetDepthSortFrom = (camera) ? camera.position : Vector3.Zero();
                }
                data.depthSortedFacets = [];
                for (var f = 0; f < data.facetNb; f++) {
                    var depthSortedFacet = { ind: f * 3, sqDistance: 0.0 };
                    data.depthSortedFacets.push(depthSortedFacet);
                }
                data.invertedMatrix = Matrix.Identity();
                data.facetDepthSortOrigin = Vector3.Zero();
            }

            data.bbSize.x = (bInfo.maximum.x - bInfo.minimum.x > Epsilon) ? bInfo.maximum.x - bInfo.minimum.x : Epsilon;
            data.bbSize.y = (bInfo.maximum.y - bInfo.minimum.y > Epsilon) ? bInfo.maximum.y - bInfo.minimum.y : Epsilon;
            data.bbSize.z = (bInfo.maximum.z - bInfo.minimum.z > Epsilon) ? bInfo.maximum.z - bInfo.minimum.z : Epsilon;
            var bbSizeMax = (data.bbSize.x > data.bbSize.y) ? data.bbSize.x : data.bbSize.y;
            bbSizeMax = (bbSizeMax > data.bbSize.z) ? bbSizeMax : data.bbSize.z;
            data.subDiv.max = data.partitioningSubdivisions;
            data.subDiv.X = Math.floor(data.subDiv.max * data.bbSize.x / bbSizeMax);   // adjust the number of subdivisions per axis
            data.subDiv.Y = Math.floor(data.subDiv.max * data.bbSize.y / bbSizeMax);   // according to each bbox size per axis
            data.subDiv.Z = Math.floor(data.subDiv.max * data.bbSize.z / bbSizeMax);
            data.subDiv.X = data.subDiv.X < 1 ? 1 : data.subDiv.X;                     // at least one subdivision
            data.subDiv.Y = data.subDiv.Y < 1 ? 1 : data.subDiv.Y;
            data.subDiv.Z = data.subDiv.Z < 1 ? 1 : data.subDiv.Z;
            // set the parameters for ComputeNormals()
            data.facetParameters.facetNormals = this.getFacetLocalNormals();
            data.facetParameters.facetPositions = this.getFacetLocalPositions();
            data.facetParameters.facetPartitioning = this.getFacetLocalPartitioning();
            data.facetParameters.bInfo = bInfo;
            data.facetParameters.bbSize = data.bbSize;
            data.facetParameters.subDiv = data.subDiv;
            data.facetParameters.ratio = this.partitioningBBoxRatio;
            data.facetParameters.depthSort = data.facetDepthSort;
            if (data.facetDepthSort && data.facetDepthSortEnabled) {
                this.computeWorldMatrix(true);
                this._worldMatrix.invertToRef(data.invertedMatrix);
                Vector3.TransformCoordinatesToRef(data.facetDepthSortFrom, data.invertedMatrix, data.facetDepthSortOrigin);
                data.facetParameters.distanceTo = data.facetDepthSortOrigin;
            }
            data.facetParameters.depthSortedFacets = data.depthSortedFacets;
            VertexData.ComputeNormals(positions, indices, normals, data.facetParameters);

            if (data.facetDepthSort && data.facetDepthSortEnabled) {
                data.depthSortedFacets.sort(data.facetDepthSortFunction);
                var l = (data.depthSortedIndices.length / 3) | 0;
                for (var f = 0; f < l; f++) {
                    var sind = data.depthSortedFacets[f].ind;
                    data.depthSortedIndices[f * 3] = indices![sind];
                    data.depthSortedIndices[f * 3 + 1] = indices![sind + 1];
                    data.depthSortedIndices[f * 3 + 2] = indices![sind + 2];
                }
                this.updateIndices(data.depthSortedIndices);
            }

            return this;
        }

        /**
         * Returns the facetLocalNormals array.
         * The normals are expressed in the mesh local spac
         * @returns an array of Vector3
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata
         */
        public getFacetLocalNormals(): Vector3[] {
            if (!this._facetData.facetNormals) {
                this.updateFacetData();
            }
            return this._facetData.facetNormals;
        }

        /**
         * Returns the facetLocalPositions array.
         * The facet positions are expressed in the mesh local space
         * @returns an array of Vector3
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata
         */
        public getFacetLocalPositions(): Vector3[] {
            if (!this._facetData.facetPositions) {
                this.updateFacetData();
            }
            return this._facetData.facetPositions;
        }

        /**
         * Returns the facetLocalPartioning array
         * @returns an array of array of numbers
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata
         */
        public getFacetLocalPartitioning(): number[][] {
            if (!this._facetData.facetPartitioning) {
                this.updateFacetData();
            }
            return this._facetData.facetPartitioning;
        }

        /**
         * Returns the i-th facet position in the world system.
         * This method allocates a new Vector3 per call
         * @param i defines the facet index
         * @returns a new Vector3
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata
         */
        public getFacetPosition(i: number): Vector3 {
            var pos = Vector3.Zero();
            this.getFacetPositionToRef(i, pos);
            return pos;
        }

        /**
         * Sets the reference Vector3 with the i-th facet position in the world system
         * @param i defines the facet index
         * @param ref defines the target vector
         * @returns the current mesh
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata
         */
        public getFacetPositionToRef(i: number, ref: Vector3): AbstractMesh {
            var localPos = (this.getFacetLocalPositions())[i];
            var world = this.getWorldMatrix();
            Vector3.TransformCoordinatesToRef(localPos, world, ref);
            return this;
        }

        /**
         * Returns the i-th facet normal in the world system.
         * This method allocates a new Vector3 per call
         * @param i defines the facet index
         * @returns a new Vector3
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata
         */
        public getFacetNormal(i: number): Vector3 {
            var norm = Vector3.Zero();
            this.getFacetNormalToRef(i, norm);
            return norm;
        }

        /**
         * Sets the reference Vector3 with the i-th facet normal in the world system
         * @param i defines the facet index
         * @param ref defines the target vector
         * @returns the current mesh
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata
         */
        public getFacetNormalToRef(i: number, ref: Vector3) {
            var localNorm = (this.getFacetLocalNormals())[i];
            Vector3.TransformNormalToRef(localNorm, this.getWorldMatrix(), ref);
            return this;
        }

        /**
         * Returns the facets (in an array) in the same partitioning block than the one the passed coordinates are located (expressed in the mesh local system)
         * @param x defines x coordinate
         * @param y defines y coordinate
         * @param z defines z coordinate
         * @returns the array of facet indexes
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata
         */
        public getFacetsAtLocalCoordinates(x: number, y: number, z: number): Nullable<number[]> {
            var bInfo = this.getBoundingInfo();
            const data = this._facetData;

            var ox = Math.floor((x - bInfo.minimum.x * data.partitioningBBoxRatio) * data.subDiv.X * data.partitioningBBoxRatio / data.bbSize.x);
            var oy = Math.floor((y - bInfo.minimum.y * data.partitioningBBoxRatio) * data.subDiv.Y * data.partitioningBBoxRatio / data.bbSize.y);
            var oz = Math.floor((z - bInfo.minimum.z * data.partitioningBBoxRatio) * data.subDiv.Z * data.partitioningBBoxRatio / data.bbSize.z);
            if (ox < 0 || ox > data.subDiv.max || oy < 0 || oy > data.subDiv.max || oz < 0 || oz > data.subDiv.max) {
                return null;
            }
            return data.facetPartitioning[ox + data.subDiv.max * oy + data.subDiv.max * data.subDiv.max * oz];
        }

        /**
         * Returns the closest mesh facet index at (x,y,z) World coordinates, null if not found
         * @param projected sets as the (x,y,z) world projection on the facet
         * @param checkFace if true (default false), only the facet "facing" to (x,y,z) or only the ones "turning their backs", according to the parameter "facing" are returned
         * @param facing if facing and checkFace are true, only the facet "facing" to (x, y, z) are returned : positive dot (x, y, z) * facet position. If facing si false and checkFace is true, only the facet "turning their backs" to (x, y, z) are returned : negative dot (x, y, z) * facet position
         * @param x defines x coordinate
         * @param y defines y coordinate
         * @param z defines z coordinate
         * @returns the face index if found (or null instead)
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata
         */
        public getClosestFacetAtCoordinates(x: number, y: number, z: number, projected?: Vector3, checkFace: boolean = false, facing: boolean = true): Nullable<number> {
            var world = this.getWorldMatrix();
            var invMat = Tmp.Matrix[5];
            world.invertToRef(invMat);
            var invVect = Tmp.Vector3[8];
            Vector3.TransformCoordinatesFromFloatsToRef(x, y, z, invMat, invVect);  // transform (x,y,z) to coordinates in the mesh local space
            var closest = this.getClosestFacetAtLocalCoordinates(invVect.x, invVect.y, invVect.z, projected, checkFace, facing);
            if (projected) {
                // tranform the local computed projected vector to world coordinates
                Vector3.TransformCoordinatesFromFloatsToRef(projected.x, projected.y, projected.z, world, projected);
            }
            return closest;
        }

        /**
         * Returns the closest mesh facet index at (x,y,z) local coordinates, null if not found
         * @param projected sets as the (x,y,z) local projection on the facet
         * @param checkFace if true (default false), only the facet "facing" to (x,y,z) or only the ones "turning their backs", according to the parameter "facing" are returned
         * @param facing if facing and checkFace are true, only the facet "facing" to (x, y, z) are returned : positive dot (x, y, z) * facet position. If facing si false and checkFace is true, only the facet "turning their backs" to (x, y, z) are returned : negative dot (x, y, z) * facet position
         * @param x defines x coordinate
         * @param y defines y coordinate
         * @param z defines z coordinate
         * @returns the face index if found (or null instead)
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata
         */
        public getClosestFacetAtLocalCoordinates(x: number, y: number, z: number, projected?: Vector3, checkFace: boolean = false, facing: boolean = true): Nullable<number> {
            var closest = null;
            var tmpx = 0.0;
            var tmpy = 0.0;
            var tmpz = 0.0;
            var d = 0.0;            // tmp dot facet normal * facet position
            var t0 = 0.0;
            var projx = 0.0;
            var projy = 0.0;
            var projz = 0.0;
            // Get all the facets in the same partitioning block than (x, y, z)
            var facetPositions = this.getFacetLocalPositions();
            var facetNormals = this.getFacetLocalNormals();
            var facetsInBlock = this.getFacetsAtLocalCoordinates(x, y, z);
            if (!facetsInBlock) {
                return null;
            }
            // Get the closest facet to (x, y, z)
            var shortest = Number.MAX_VALUE;            // init distance vars
            var tmpDistance = shortest;
            var fib;                                    // current facet in the block
            var norm;                                   // current facet normal
            var p0;                                     // current facet barycenter position
            // loop on all the facets in the current partitioning block
            for (var idx = 0; idx < facetsInBlock.length; idx++) {
                fib = facetsInBlock[idx];
                norm = facetNormals[fib];
                p0 = facetPositions[fib];

                d = (x - p0.x) * norm.x + (y - p0.y) * norm.y + (z - p0.z) * norm.z;
                if (!checkFace || (checkFace && facing && d >= 0.0) || (checkFace && !facing && d <= 0.0)) {
                    // compute (x,y,z) projection on the facet = (projx, projy, projz)
                    d = norm.x * p0.x + norm.y * p0.y + norm.z * p0.z;
                    t0 = -(norm.x * x + norm.y * y + norm.z * z - d) / (norm.x * norm.x + norm.y * norm.y + norm.z * norm.z);
                    projx = x + norm.x * t0;
                    projy = y + norm.y * t0;
                    projz = z + norm.z * t0;

                    tmpx = projx - x;
                    tmpy = projy - y;
                    tmpz = projz - z;
                    tmpDistance = tmpx * tmpx + tmpy * tmpy + tmpz * tmpz;             // compute length between (x, y, z) and its projection on the facet
                    if (tmpDistance < shortest) {                                      // just keep the closest facet to (x, y, z)
                        shortest = tmpDistance;
                        closest = fib;
                        if (projected) {
                            projected.x = projx;
                            projected.y = projy;
                            projected.z = projz;
                        }
                    }
                }
            }
            return closest;
        }

        /**
         * Returns the object "parameter" set with all the expected parameters for facetData computation by ComputeNormals()
         * @returns the parameters
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata
         */
        public getFacetDataParameters(): any {
            return this._facetData.facetParameters;
        }

        /**
         * Disables the feature FacetData and frees the related memory
         * @returns the current mesh
         * @see http://doc.babylonjs.com/how_to/how_to_use_facetdata
         */
        public disableFacetData(): AbstractMesh {
            if (this._facetData.facetDataEnabled) {
                this._facetData.facetDataEnabled = false;
                this._facetData.facetPositions = new Array<Vector3>();
                this._facetData.facetNormals = new Array<Vector3>();
                this._facetData.facetPartitioning = new Array<number[]>();
                this._facetData.facetParameters = null;
                this._facetData.depthSortedIndices = new Uint32Array(0);
            }
            return this;
        }

        /**
         * Updates the AbstractMesh indices array
         * @param indices defines the data source
         * @returns the current mesh
         */
        public updateIndices(indices: IndicesArray): AbstractMesh {
            return this;
        }

        /**
         * Creates new normals data for the mesh
         * @param updatable defines if the normal vertex buffer must be flagged as updatable
         * @returns the current mesh
         */
        public createNormals(updatable: boolean): AbstractMesh {
            var positions = this.getVerticesData(VertexBuffer.PositionKind);
            var indices = this.getIndices();
            var normals: FloatArray;

            if (this.isVerticesDataPresent(VertexBuffer.NormalKind)) {
                normals = (<FloatArray>this.getVerticesData(VertexBuffer.NormalKind));
            } else {
                normals = [];
            }

            VertexData.ComputeNormals(positions, indices, normals, { useRightHandedSystem: this.getScene().useRightHandedSystem });
            this.setVerticesData(VertexBuffer.NormalKind, normals, updatable);
            return this;
        }

        /**
         * Align the mesh with a normal
         * @param normal defines the normal to use
         * @param upDirection can be used to redefined the up vector to use (will use the (0, 1, 0) by default)
         * @returns the current mesh
         */
        public alignWithNormal(normal: Vector3, upDirection?: Vector3): AbstractMesh {
            if (!upDirection) {
                upDirection = Axis.Y;
            }

            var axisX = Tmp.Vector3[0];
            var axisZ = Tmp.Vector3[1];
            Vector3.CrossToRef(upDirection, normal, axisZ);
            Vector3.CrossToRef(normal, axisZ, axisX);

            if (this.rotationQuaternion) {
                Quaternion.RotationQuaternionFromAxisToRef(axisX, normal, axisZ, this.rotationQuaternion);
            } else {
                Vector3.RotationFromAxisToRef(axisX, normal, axisZ, this.rotation);
            }
            return this;
        }

        /** @hidden */
        public _checkOcclusionQuery(): boolean { // Will be replaced by correct code if Occlusion queries are referenced
            return false;
        }
    }
}