import { Nullable, FloatArray, IndicesArray } from "../types";
import { Matrix, Vector3, Vector2, Color3, Color4, Vector4 } from "../Maths/math";
import { VertexBuffer } from "../Meshes/buffer";
import { _DevTools } from '../Misc/devTools';

declare type Geometry = import("../Meshes/geometry").Geometry;
declare type Mesh = import("../Meshes/mesh").Mesh;

/**
 * Define an interface for all classes that will get and set the data on vertices
 */
export interface IGetSetVerticesData {
    /**
     * 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
     */
    isVerticesDataPresent(kind: string): boolean;
    /**
     * Gets a specific vertex data attached to this geometry. Float data is constructed if the vertex buffer data cannot be returned directly.
     * @param kind defines the data kind (Position, normal, etc...)
     * @param copyWhenShared defines if the returned array must be cloned upon returning it if the current geometry is shared between multiple meshes
     * @param forceCopy defines a boolean indicating that the returned array must be cloned upon returning it
     * @returns a float array containing vertex data
     */
    getVerticesData(kind: string, copyWhenShared?: boolean, forceCopy?: boolean): Nullable<FloatArray>;
    /**
     * Returns an array of integers or a typed array (Int32Array, Uint32Array, Uint16Array) populated with the mesh indices.
     * @param copyWhenShared If true (default false) and and if the mesh geometry is shared among some other meshes, the returned array is a copy of the internal one.
     * @param forceCopy defines a boolean indicating that the returned array must be cloned upon returning it
     * @returns the indices array or an empty array if the mesh has no geometry
     */
    getIndices(copyWhenShared?: boolean, forceCopy?: boolean): Nullable<IndicesArray>;
    /**
     * Set specific vertex data
     * @param kind defines the data kind (Position, normal, etc...)
     * @param data defines the vertex data to use
     * @param updatable defines if the vertex must be flagged as updatable (false as default)
     * @param stride defines the stride to use (0 by default). This value is deduced from the kind value if not specified
     */
    setVerticesData(kind: string, data: FloatArray, updatable: boolean): void;
    /**
     * Update a specific associated vertex buffer
     * @param kind defines which buffer to write to (positions, indices, normals, etc). Possible `kind` values :
     * - VertexBuffer.PositionKind
     * - VertexBuffer.UVKind
     * - VertexBuffer.UV2Kind
     * - VertexBuffer.UV3Kind
     * - VertexBuffer.UV4Kind
     * - VertexBuffer.UV5Kind
     * - VertexBuffer.UV6Kind
     * - VertexBuffer.ColorKind
     * - VertexBuffer.MatricesIndicesKind
     * - VertexBuffer.MatricesIndicesExtraKind
     * - VertexBuffer.MatricesWeightsKind
     * - VertexBuffer.MatricesWeightsExtraKind
     * @param data defines the data source
     * @param updateExtends defines if extends info of the mesh must be updated (can be null). This is mostly useful for "position" kind
     * @param makeItUnique defines if the geometry associated with the mesh must be cloned to make the change only for this mesh (and not all meshes associated with the same geometry)
     */
    updateVerticesData(kind: string, data: FloatArray, updateExtends?: boolean, makeItUnique?: boolean): void;
    /**
     * Creates a new index buffer
     * @param indices defines the indices to store in the index buffer
     * @param totalVertices defines the total number of vertices (could be null)
     * @param updatable defines if the index buffer must be flagged as updatable (false by default)
     */
    setIndices(indices: IndicesArray, totalVertices: Nullable<number>, updatable?: boolean): void;
}

/**
 * This class contains the various kinds of data on every vertex of a mesh used in determining its shape and appearance
 */
export class VertexData {
    /**
     * Mesh side orientation : usually the external or front surface
     */
    public static readonly FRONTSIDE = 0;
    /**
     * Mesh side orientation : usually the internal or back surface
     */
    public static readonly BACKSIDE = 1;
    /**
     * Mesh side orientation : both internal and external or front and back surfaces
     */
    public static readonly DOUBLESIDE = 2;
    /**
     * Mesh side orientation : by default, `FRONTSIDE`
     */
    public static readonly DEFAULTSIDE = 0;

    /**
     * An array of the x, y, z position of each vertex  [...., x, y, z, .....]
     */
    public positions: Nullable<FloatArray>;

    /**
     * An array of the x, y, z normal vector of each vertex  [...., x, y, z, .....]
     */
    public normals: Nullable<FloatArray>;

    /**
     * An array of the x, y, z tangent vector of each vertex  [...., x, y, z, .....]
     */
    public tangents: Nullable<FloatArray>;

    /**
     * An array of u,v which maps a texture image onto each vertex  [...., u, v, .....]
     */
    public uvs: Nullable<FloatArray>;

    /**
     * A second array of u,v which maps a texture image onto each vertex  [...., u, v, .....]
     */
    public uvs2: Nullable<FloatArray>;

    /**
     * A third array of u,v which maps a texture image onto each vertex  [...., u, v, .....]
     */
    public uvs3: Nullable<FloatArray>;

    /**
     * A fourth array of u,v which maps a texture image onto each vertex  [...., u, v, .....]
     */
    public uvs4: Nullable<FloatArray>;

    /**
     * A fifth array of u,v which maps a texture image onto each vertex  [...., u, v, .....]
     */
    public uvs5: Nullable<FloatArray>;

    /**
     * A sixth array of u,v which maps a texture image onto each vertex  [...., u, v, .....]
     */
    public uvs6: Nullable<FloatArray>;

    /**
     * An array of the r, g, b, a, color of each vertex  [...., r, g, b, a, .....]
     */
    public colors: Nullable<FloatArray>;

    /**
     * An array containing the list of indices to the array of matrices produced by bones, each vertex have up to 4 indices (8 if the matricesIndicesExtra is set).
     */
    public matricesIndices: Nullable<FloatArray>;

    /**
     * An array containing the list of weights defining the weight of each indexed matrix in the final computation
     */
    public matricesWeights: Nullable<FloatArray>;

    /**
     * An array extending the number of possible indices
     */
    public matricesIndicesExtra: Nullable<FloatArray>;

    /**
     * An array extending the number of possible weights when the number of indices is extended
     */
    public matricesWeightsExtra: Nullable<FloatArray>;

    /**
     * An array of i, j, k the three vertex indices required for each triangular facet  [...., i, j, k .....]
     */
    public indices: Nullable<IndicesArray>;

    /**
     * Uses the passed data array to set the set the values for the specified kind of data
     * @param data a linear array of floating numbers
     * @param kind the type of data that is being set, eg positions, colors etc
     */
    public set(data: FloatArray, kind: string) {
        switch (kind) {
            case VertexBuffer.PositionKind:
                this.positions = data;
                break;
            case VertexBuffer.NormalKind:
                this.normals = data;
                break;
            case VertexBuffer.TangentKind:
                this.tangents = data;
                break;
            case VertexBuffer.UVKind:
                this.uvs = data;
                break;
            case VertexBuffer.UV2Kind:
                this.uvs2 = data;
                break;
            case VertexBuffer.UV3Kind:
                this.uvs3 = data;
                break;
            case VertexBuffer.UV4Kind:
                this.uvs4 = data;
                break;
            case VertexBuffer.UV5Kind:
                this.uvs5 = data;
                break;
            case VertexBuffer.UV6Kind:
                this.uvs6 = data;
                break;
            case VertexBuffer.ColorKind:
                this.colors = data;
                break;
            case VertexBuffer.MatricesIndicesKind:
                this.matricesIndices = data;
                break;
            case VertexBuffer.MatricesWeightsKind:
                this.matricesWeights = data;
                break;
            case VertexBuffer.MatricesIndicesExtraKind:
                this.matricesIndicesExtra = data;
                break;
            case VertexBuffer.MatricesWeightsExtraKind:
                this.matricesWeightsExtra = data;
                break;
        }
    }

    /**
     * Associates the vertexData to the passed Mesh.
     * Sets it as updatable or not (default `false`)
     * @param mesh the mesh the vertexData is applied to
     * @param updatable when used and having the value true allows new data to update the vertexData
     * @returns the VertexData
     */
    public applyToMesh(mesh: Mesh, updatable?: boolean): VertexData {
        this._applyTo(mesh, updatable);
        return this;
    }

    /**
     * Associates the vertexData to the passed Geometry.
     * Sets it as updatable or not (default `false`)
     * @param geometry the geometry the vertexData is applied to
     * @param updatable when used and having the value true allows new data to update the vertexData
     * @returns VertexData
     */
    public applyToGeometry(geometry: Geometry, updatable?: boolean): VertexData {
        this._applyTo(geometry, updatable);
        return this;
    }

    /**
     * Updates the associated mesh
     * @param mesh the mesh to be updated
     * @param updateExtends when true the mesh BoundingInfo will be renewed when and if position kind is updated, optional with default false
     * @param makeItUnique when true, and when and if position kind is updated, a new global geometry will be  created from these positions and set to the mesh, optional with default false
     * @returns VertexData
     */
    public updateMesh(mesh: Mesh): VertexData {
        this._update(mesh);
        return this;
    }

    /**
     * Updates the associated geometry
     * @param geometry the geometry to be updated
     * @param updateExtends when true BoundingInfo will be renewed when and if position kind is updated, optional with default false
     * @param makeItUnique when true, and when and if position kind is updated, a new global geometry will be created from these positions and set to the mesh, optional with default false
     * @returns VertexData.
     */
    public updateGeometry(geometry: Geometry): VertexData {
        this._update(geometry);
        return this;
    }

    private _applyTo(meshOrGeometry: IGetSetVerticesData, updatable: boolean = false): VertexData {
        if (this.positions) {
            meshOrGeometry.setVerticesData(VertexBuffer.PositionKind, this.positions, updatable);
        }

        if (this.normals) {
            meshOrGeometry.setVerticesData(VertexBuffer.NormalKind, this.normals, updatable);
        }

        if (this.tangents) {
            meshOrGeometry.setVerticesData(VertexBuffer.TangentKind, this.tangents, updatable);
        }

        if (this.uvs) {
            meshOrGeometry.setVerticesData(VertexBuffer.UVKind, this.uvs, updatable);
        }

        if (this.uvs2) {
            meshOrGeometry.setVerticesData(VertexBuffer.UV2Kind, this.uvs2, updatable);
        }

        if (this.uvs3) {
            meshOrGeometry.setVerticesData(VertexBuffer.UV3Kind, this.uvs3, updatable);
        }

        if (this.uvs4) {
            meshOrGeometry.setVerticesData(VertexBuffer.UV4Kind, this.uvs4, updatable);
        }

        if (this.uvs5) {
            meshOrGeometry.setVerticesData(VertexBuffer.UV5Kind, this.uvs5, updatable);
        }

        if (this.uvs6) {
            meshOrGeometry.setVerticesData(VertexBuffer.UV6Kind, this.uvs6, updatable);
        }

        if (this.colors) {
            meshOrGeometry.setVerticesData(VertexBuffer.ColorKind, this.colors, updatable);
        }

        if (this.matricesIndices) {
            meshOrGeometry.setVerticesData(VertexBuffer.MatricesIndicesKind, this.matricesIndices, updatable);
        }

        if (this.matricesWeights) {
            meshOrGeometry.setVerticesData(VertexBuffer.MatricesWeightsKind, this.matricesWeights, updatable);
        }

        if (this.matricesIndicesExtra) {
            meshOrGeometry.setVerticesData(VertexBuffer.MatricesIndicesExtraKind, this.matricesIndicesExtra, updatable);
        }

        if (this.matricesWeightsExtra) {
            meshOrGeometry.setVerticesData(VertexBuffer.MatricesWeightsExtraKind, this.matricesWeightsExtra, updatable);
        }

        if (this.indices) {
            meshOrGeometry.setIndices(this.indices, null, updatable);
        } else {
            meshOrGeometry.setIndices([], null);
        }

        return this;
    }

    private _update(meshOrGeometry: IGetSetVerticesData, updateExtends?: boolean, makeItUnique?: boolean): VertexData {
        if (this.positions) {
            meshOrGeometry.updateVerticesData(VertexBuffer.PositionKind, this.positions, updateExtends, makeItUnique);
        }

        if (this.normals) {
            meshOrGeometry.updateVerticesData(VertexBuffer.NormalKind, this.normals, updateExtends, makeItUnique);
        }

        if (this.tangents) {
            meshOrGeometry.updateVerticesData(VertexBuffer.TangentKind, this.tangents, updateExtends, makeItUnique);
        }

        if (this.uvs) {
            meshOrGeometry.updateVerticesData(VertexBuffer.UVKind, this.uvs, updateExtends, makeItUnique);
        }

        if (this.uvs2) {
            meshOrGeometry.updateVerticesData(VertexBuffer.UV2Kind, this.uvs2, updateExtends, makeItUnique);
        }

        if (this.uvs3) {
            meshOrGeometry.updateVerticesData(VertexBuffer.UV3Kind, this.uvs3, updateExtends, makeItUnique);
        }

        if (this.uvs4) {
            meshOrGeometry.updateVerticesData(VertexBuffer.UV4Kind, this.uvs4, updateExtends, makeItUnique);
        }

        if (this.uvs5) {
            meshOrGeometry.updateVerticesData(VertexBuffer.UV5Kind, this.uvs5, updateExtends, makeItUnique);
        }

        if (this.uvs6) {
            meshOrGeometry.updateVerticesData(VertexBuffer.UV6Kind, this.uvs6, updateExtends, makeItUnique);
        }

        if (this.colors) {
            meshOrGeometry.updateVerticesData(VertexBuffer.ColorKind, this.colors, updateExtends, makeItUnique);
        }

        if (this.matricesIndices) {
            meshOrGeometry.updateVerticesData(VertexBuffer.MatricesIndicesKind, this.matricesIndices, updateExtends, makeItUnique);
        }

        if (this.matricesWeights) {
            meshOrGeometry.updateVerticesData(VertexBuffer.MatricesWeightsKind, this.matricesWeights, updateExtends, makeItUnique);
        }

        if (this.matricesIndicesExtra) {
            meshOrGeometry.updateVerticesData(VertexBuffer.MatricesIndicesExtraKind, this.matricesIndicesExtra, updateExtends, makeItUnique);
        }

        if (this.matricesWeightsExtra) {
            meshOrGeometry.updateVerticesData(VertexBuffer.MatricesWeightsExtraKind, this.matricesWeightsExtra, updateExtends, makeItUnique);
        }

        if (this.indices) {
            meshOrGeometry.setIndices(this.indices, null);
        }
        return this;
    }

    /**
     * Transforms each position and each normal of the vertexData according to the passed Matrix
     * @param matrix the transforming matrix
     * @returns the VertexData
     */
    public transform(matrix: Matrix): VertexData {
        var flip = matrix.m[0] * matrix.m[5] * matrix.m[10] < 0;
        var transformed = Vector3.Zero();
        var index: number;
        if (this.positions) {
            var position = Vector3.Zero();

            for (index = 0; index < this.positions.length; index += 3) {
                Vector3.FromArrayToRef(this.positions, index, position);

                Vector3.TransformCoordinatesToRef(position, matrix, transformed);
                this.positions[index] = transformed.x;
                this.positions[index + 1] = transformed.y;
                this.positions[index + 2] = transformed.z;
            }
        }

        if (this.normals) {
            var normal = Vector3.Zero();

            for (index = 0; index < this.normals.length; index += 3) {
                Vector3.FromArrayToRef(this.normals, index, normal);

                Vector3.TransformNormalToRef(normal, matrix, transformed);
                this.normals[index] = transformed.x;
                this.normals[index + 1] = transformed.y;
                this.normals[index + 2] = transformed.z;
            }
        }

        if (this.tangents) {
            var tangent = Vector4.Zero();
            var tangentTransformed = Vector4.Zero();

            for (index = 0; index < this.tangents.length; index += 4) {
                Vector4.FromArrayToRef(this.tangents, index, tangent);

                Vector4.TransformNormalToRef(tangent, matrix, tangentTransformed);
                this.tangents[index] = tangentTransformed.x;
                this.tangents[index + 1] = tangentTransformed.y;
                this.tangents[index + 2] = tangentTransformed.z;
                this.tangents[index + 3] = tangentTransformed.w;
            }
        }

        if (flip && this.indices) {
            for (index = 0; index < this.indices!.length; index += 3) {
                let tmp = this.indices[index + 1];
                this.indices[index + 1] = this.indices[index + 2];
                this.indices[index + 2] = tmp;
            }
        }

        return this;
    }

    /**
     * Merges the passed VertexData into the current one
     * @param other the VertexData to be merged into the current one
     * @param use32BitsIndices defines a boolean indicating if indices must be store in a 32 bits array
     * @returns the modified VertexData
     */
    public merge(other: VertexData, use32BitsIndices = false): VertexData {
        this._validate();
        other._validate();

        if (!this.normals !== !other.normals ||
            !this.tangents !== !other.tangents ||
            !this.uvs !== !other.uvs ||
            !this.uvs2 !== !other.uvs2 ||
            !this.uvs3 !== !other.uvs3 ||
            !this.uvs4 !== !other.uvs4 ||
            !this.uvs5 !== !other.uvs5 ||
            !this.uvs6 !== !other.uvs6 ||
            !this.colors !== !other.colors ||
            !this.matricesIndices !== !other.matricesIndices ||
            !this.matricesWeights !== !other.matricesWeights ||
            !this.matricesIndicesExtra !== !other.matricesIndicesExtra ||
            !this.matricesWeightsExtra !== !other.matricesWeightsExtra) {
            throw new Error("Cannot merge vertex data that do not have the same set of attributes");
        }

        if (other.indices) {
            if (!this.indices) {
                this.indices = [];
            }

            var offset = this.positions ? this.positions.length / 3 : 0;

            var isSrcTypedArray = (<any>this.indices).BYTES_PER_ELEMENT !== undefined;

            if (isSrcTypedArray) {
                var len = this.indices.length + other.indices.length;
                var temp = use32BitsIndices || this.indices instanceof Uint32Array ? new Uint32Array(len) : new Uint16Array(len);
                temp.set(this.indices);

                let decal = this.indices.length;
                for (var index = 0; index < other.indices.length; index++) {
                    temp[decal + index] = other.indices[index] + offset;
                }

                this.indices = temp;
            } else {
                for (var index = 0; index < other.indices.length; index++) {
                    (<number[]>this.indices).push(other.indices[index] + offset);
                }
            }
        }

        this.positions = this._mergeElement(this.positions, other.positions);
        this.normals = this._mergeElement(this.normals, other.normals);
        this.tangents = this._mergeElement(this.tangents, other.tangents);
        this.uvs = this._mergeElement(this.uvs, other.uvs);
        this.uvs2 = this._mergeElement(this.uvs2, other.uvs2);
        this.uvs3 = this._mergeElement(this.uvs3, other.uvs3);
        this.uvs4 = this._mergeElement(this.uvs4, other.uvs4);
        this.uvs5 = this._mergeElement(this.uvs5, other.uvs5);
        this.uvs6 = this._mergeElement(this.uvs6, other.uvs6);
        this.colors = this._mergeElement(this.colors, other.colors);
        this.matricesIndices = this._mergeElement(this.matricesIndices, other.matricesIndices);
        this.matricesWeights = this._mergeElement(this.matricesWeights, other.matricesWeights);
        this.matricesIndicesExtra = this._mergeElement(this.matricesIndicesExtra, other.matricesIndicesExtra);
        this.matricesWeightsExtra = this._mergeElement(this.matricesWeightsExtra, other.matricesWeightsExtra);
        return this;
    }

    private _mergeElement(source: Nullable<FloatArray>, other: Nullable<FloatArray>): Nullable<FloatArray> {
        if (!source) {
            return other;
        }

        if (!other) {
            return source;
        }

        var len = other.length + source.length;
        var isSrcTypedArray = source instanceof Float32Array;
        var isOthTypedArray = other instanceof Float32Array;

        // use non-loop method when the source is Float32Array
        if (isSrcTypedArray) {
            var ret32 = new Float32Array(len);
            ret32.set(source);
            ret32.set(other, source.length);
            return ret32;

            // source is number[], when other is also use concat
        } else if (!isOthTypedArray) {
            return (<number[]>source).concat(<number[]>other);

            // source is a number[], but other is a Float32Array, loop required
        } else {
            var ret = (<number[]>source).slice(0); // copy source to a separate array
            for (var i = 0, len = other.length; i < len; i++) {
                ret.push(other[i]);
            }
            return ret;
        }
    }

    private _validate(): void {
        if (!this.positions) {
            throw new Error("Positions are required");
        }

        const getElementCount = (kind: string, values: FloatArray) => {
            const stride = VertexBuffer.DeduceStride(kind);
            if ((values.length % stride) !== 0) {
                throw new Error("The " + kind + "s array count must be a multiple of " + stride);
            }

            return values.length / stride;
        };

        const positionsElementCount = getElementCount(VertexBuffer.PositionKind, this.positions);

        const validateElementCount = (kind: string, values: FloatArray) => {
            const elementCount = getElementCount(kind, values);
            if (elementCount !== positionsElementCount) {
                throw new Error("The " + kind + "s element count (" + elementCount + ") does not match the positions count (" + positionsElementCount + ")");
            }
        };

        if (this.normals) { validateElementCount(VertexBuffer.NormalKind, this.normals); }
        if (this.tangents) { validateElementCount(VertexBuffer.TangentKind, this.tangents); }
        if (this.uvs) { validateElementCount(VertexBuffer.UVKind, this.uvs); }
        if (this.uvs2) { validateElementCount(VertexBuffer.UV2Kind, this.uvs2); }
        if (this.uvs3) { validateElementCount(VertexBuffer.UV3Kind, this.uvs3); }
        if (this.uvs4) { validateElementCount(VertexBuffer.UV4Kind, this.uvs4); }
        if (this.uvs5) { validateElementCount(VertexBuffer.UV5Kind, this.uvs5); }
        if (this.uvs6) { validateElementCount(VertexBuffer.UV6Kind, this.uvs6); }
        if (this.colors) { validateElementCount(VertexBuffer.ColorKind, this.colors); }
        if (this.matricesIndices) { validateElementCount(VertexBuffer.MatricesIndicesKind, this.matricesIndices); }
        if (this.matricesWeights) { validateElementCount(VertexBuffer.MatricesWeightsKind, this.matricesWeights); }
        if (this.matricesIndicesExtra) { validateElementCount(VertexBuffer.MatricesIndicesExtraKind, this.matricesIndicesExtra); }
        if (this.matricesWeightsExtra) { validateElementCount(VertexBuffer.MatricesWeightsExtraKind, this.matricesWeightsExtra); }
    }

    /**
     * Serializes the VertexData
     * @returns a serialized object
     */
    public serialize(): any {
        var serializationObject = this.serialize();

        if (this.positions) {
            serializationObject.positions = this.positions;
        }

        if (this.normals) {
            serializationObject.normals = this.normals;
        }

        if (this.tangents) {
            serializationObject.tangents = this.tangents;
        }

        if (this.uvs) {
            serializationObject.uvs = this.uvs;
        }

        if (this.uvs2) {
            serializationObject.uvs2 = this.uvs2;
        }

        if (this.uvs3) {
            serializationObject.uvs3 = this.uvs3;
        }

        if (this.uvs4) {
            serializationObject.uvs4 = this.uvs4;
        }

        if (this.uvs5) {
            serializationObject.uvs5 = this.uvs5;
        }

        if (this.uvs6) {
            serializationObject.uvs6 = this.uvs6;
        }

        if (this.colors) {
            serializationObject.colors = this.colors;
        }

        if (this.matricesIndices) {
            serializationObject.matricesIndices = this.matricesIndices;
            serializationObject.matricesIndices._isExpanded = true;
        }

        if (this.matricesWeights) {
            serializationObject.matricesWeights = this.matricesWeights;
        }

        if (this.matricesIndicesExtra) {
            serializationObject.matricesIndicesExtra = this.matricesIndicesExtra;
            serializationObject.matricesIndicesExtra._isExpanded = true;
        }

        if (this.matricesWeightsExtra) {
            serializationObject.matricesWeightsExtra = this.matricesWeightsExtra;
        }

        serializationObject.indices = this.indices;

        return serializationObject;
    }

    // Statics
    /**
     * Extracts the vertexData from a mesh
     * @param mesh the mesh from which to extract the VertexData
     * @param copyWhenShared defines if the VertexData must be cloned when shared between multiple meshes, optional, default false
     * @param forceCopy indicating that the VertexData must be cloned, optional, default false
     * @returns the object VertexData associated to the passed mesh
     */
    public static ExtractFromMesh(mesh: Mesh, copyWhenShared?: boolean, forceCopy?: boolean): VertexData {
        return VertexData._ExtractFrom(mesh, copyWhenShared, forceCopy);
    }

    /**
     * Extracts the vertexData from the geometry
     * @param geometry the geometry from which to extract the VertexData
     * @param copyWhenShared defines if the VertexData must be cloned when the geometrty is shared between multiple meshes, optional, default false
     * @param forceCopy indicating that the VertexData must be cloned, optional, default false
     * @returns the object VertexData associated to the passed mesh
     */
    public static ExtractFromGeometry(geometry: Geometry, copyWhenShared?: boolean, forceCopy?: boolean): VertexData {
        return VertexData._ExtractFrom(geometry, copyWhenShared, forceCopy);
    }

    private static _ExtractFrom(meshOrGeometry: IGetSetVerticesData, copyWhenShared?: boolean, forceCopy?: boolean): VertexData {
        var result = new VertexData();

        if (meshOrGeometry.isVerticesDataPresent(VertexBuffer.PositionKind)) {
            result.positions = meshOrGeometry.getVerticesData(VertexBuffer.PositionKind, copyWhenShared, forceCopy);
        }

        if (meshOrGeometry.isVerticesDataPresent(VertexBuffer.NormalKind)) {
            result.normals = meshOrGeometry.getVerticesData(VertexBuffer.NormalKind, copyWhenShared, forceCopy);
        }

        if (meshOrGeometry.isVerticesDataPresent(VertexBuffer.TangentKind)) {
            result.tangents = meshOrGeometry.getVerticesData(VertexBuffer.TangentKind, copyWhenShared, forceCopy);
        }

        if (meshOrGeometry.isVerticesDataPresent(VertexBuffer.UVKind)) {
            result.uvs = meshOrGeometry.getVerticesData(VertexBuffer.UVKind, copyWhenShared, forceCopy);
        }

        if (meshOrGeometry.isVerticesDataPresent(VertexBuffer.UV2Kind)) {
            result.uvs2 = meshOrGeometry.getVerticesData(VertexBuffer.UV2Kind, copyWhenShared, forceCopy);
        }

        if (meshOrGeometry.isVerticesDataPresent(VertexBuffer.UV3Kind)) {
            result.uvs3 = meshOrGeometry.getVerticesData(VertexBuffer.UV3Kind, copyWhenShared, forceCopy);
        }

        if (meshOrGeometry.isVerticesDataPresent(VertexBuffer.UV4Kind)) {
            result.uvs4 = meshOrGeometry.getVerticesData(VertexBuffer.UV4Kind, copyWhenShared, forceCopy);
        }

        if (meshOrGeometry.isVerticesDataPresent(VertexBuffer.UV5Kind)) {
            result.uvs5 = meshOrGeometry.getVerticesData(VertexBuffer.UV5Kind, copyWhenShared, forceCopy);
        }

        if (meshOrGeometry.isVerticesDataPresent(VertexBuffer.UV6Kind)) {
            result.uvs6 = meshOrGeometry.getVerticesData(VertexBuffer.UV6Kind, copyWhenShared, forceCopy);
        }

        if (meshOrGeometry.isVerticesDataPresent(VertexBuffer.ColorKind)) {
            result.colors = meshOrGeometry.getVerticesData(VertexBuffer.ColorKind, copyWhenShared, forceCopy);
        }

        if (meshOrGeometry.isVerticesDataPresent(VertexBuffer.MatricesIndicesKind)) {
            result.matricesIndices = meshOrGeometry.getVerticesData(VertexBuffer.MatricesIndicesKind, copyWhenShared, forceCopy);
        }

        if (meshOrGeometry.isVerticesDataPresent(VertexBuffer.MatricesWeightsKind)) {
            result.matricesWeights = meshOrGeometry.getVerticesData(VertexBuffer.MatricesWeightsKind, copyWhenShared, forceCopy);
        }

        if (meshOrGeometry.isVerticesDataPresent(VertexBuffer.MatricesIndicesExtraKind)) {
            result.matricesIndicesExtra = meshOrGeometry.getVerticesData(VertexBuffer.MatricesIndicesExtraKind, copyWhenShared, forceCopy);
        }

        if (meshOrGeometry.isVerticesDataPresent(VertexBuffer.MatricesWeightsExtraKind)) {
            result.matricesWeightsExtra = meshOrGeometry.getVerticesData(VertexBuffer.MatricesWeightsExtraKind, copyWhenShared, forceCopy);
        }

        result.indices = meshOrGeometry.getIndices(copyWhenShared, forceCopy);

        return result;
    }

    /**
     * Creates the VertexData for a Ribbon
     * @param options an object used to set the following optional parameters for the ribbon, required but can be empty
      * * pathArray array of paths, each of which an array of successive Vector3
      * * closeArray creates a seam between the first and the last paths of the pathArray, optional, default false
      * * closePath creates a seam between the first and the last points of each path of the path array, optional, default false
      * * offset a positive integer, only used when pathArray contains a single path (offset = 10 means the point 1 is joined to the point 11), default rounded half size of the pathArray length
      * * sideOrientation optional and takes the values : Mesh.FRONTSIDE (default), Mesh.BACKSIDE or Mesh.DOUBLESIDE
      * * frontUvs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the front side, optional, default vector4 (0, 0, 1, 1)
      * * backUVs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the back side, optional, default vector4 (0, 0, 1, 1)
      * * invertUV swaps in the U and V coordinates when applying a texture, optional, default false
      * * uvs a linear array, of length 2 * number of vertices, of custom UV values, optional
      * * colors a linear array, of length 4 * number of vertices, of custom color values, optional
     * @returns the VertexData of the ribbon
     */
    public static CreateRibbon(options: { pathArray: Vector3[][], closeArray?: boolean, closePath?: boolean, offset?: number, sideOrientation?: number, frontUVs?: Vector4, backUVs?: Vector4, invertUV?: boolean, uvs?: Vector2[], colors?: Color4[] }): VertexData {
        throw _DevTools.WarnImport("ribbonBuilder");
    }

    /**
     * Creates the VertexData for a box
     * @param options an object used to set the following optional parameters for the box, required but can be empty
      * * size sets the width, height and depth of the box to the value of size, optional default 1
      * * width sets the width (x direction) of the box, overwrites the width set by size, optional, default size
      * * height sets the height (y direction) of the box, overwrites the height set by size, optional, default size
      * * depth sets the depth (z direction) of the box, overwrites the depth set by size, optional, default size
      * * faceUV an array of 6 Vector4 elements used to set different images to each box side
      * * faceColors an array of 6 Color3 elements used to set different colors to each box side
      * * sideOrientation optional and takes the values : Mesh.FRONTSIDE (default), Mesh.BACKSIDE or Mesh.DOUBLESIDE
      * * frontUvs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the front side, optional, default vector4 (0, 0, 1, 1)
      * * backUVs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the back side, optional, default vector4 (0, 0, 1, 1)
     * @returns the VertexData of the box
     */
    public static CreateBox(options: { size?: number, width?: number, height?: number, depth?: number, faceUV?: Vector4[], faceColors?: Color4[], sideOrientation?: number, frontUVs?: Vector4, backUVs?: Vector4 }): VertexData {
        throw _DevTools.WarnImport("boxBuilder");
    }

    /**
     * Creates the VertexData for an ellipsoid, defaults to a sphere
     * @param options an object used to set the following optional parameters for the box, required but can be empty
      * * segments sets the number of horizontal strips optional, default 32
      * * diameter sets the axes dimensions, diameterX, diameterY and diameterZ to the value of diameter, optional default 1
      * * diameterX sets the diameterX (x direction) of the ellipsoid, overwrites the diameterX set by diameter, optional, default diameter
      * * diameterY sets the diameterY (y direction) of the ellipsoid, overwrites the diameterY set by diameter, optional, default diameter
      * * diameterZ sets the diameterZ (z direction) of the ellipsoid, overwrites the diameterZ set by diameter, optional, default diameter
      * * arc a number from 0 to 1, to create an unclosed ellipsoid based on the fraction of the circumference (latitude) given by the arc value, optional, default 1
      * * slice a number from 0 to 1, to create an unclosed ellipsoid based on the fraction of the height (latitude) given by the arc value, optional, default 1
      * * sideOrientation optional and takes the values : Mesh.FRONTSIDE (default), Mesh.BACKSIDE or Mesh.DOUBLESIDE
      * * frontUvs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the front side, optional, default vector4 (0, 0, 1, 1)
      * * backUVs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the back side, optional, default vector4 (0, 0, 1, 1)
     * @returns the VertexData of the ellipsoid
     */
    public static CreateSphere(options: { segments?: number, diameter?: number, diameterX?: number, diameterY?: number, diameterZ?: number, arc?: number, slice?: number, sideOrientation?: number, frontUVs?: Vector4, backUVs?: Vector4 }): VertexData {
        throw _DevTools.WarnImport("sphereBuilder");
    }

    /**
     * Creates the VertexData for a cylinder, cone or prism
     * @param options an object used to set the following optional parameters for the box, required but can be empty
      * * height sets the height (y direction) of the cylinder, optional, default 2
      * * diameterTop sets the diameter of the top of the cone, overwrites diameter,  optional, default diameter
      * * diameterBottom sets the diameter of the bottom of the cone, overwrites diameter,  optional, default diameter
      * * diameter sets the diameter of the top and bottom of the cone, optional default 1
      * * tessellation the number of prism sides, 3 for a triangular prism, optional, default 24
      * * subdivisions` the number of rings along the cylinder height, optional, default 1
      * * arc a number from 0 to 1, to create an unclosed cylinder based on the fraction of the circumference given by the arc value, optional, default 1
      * * faceColors an array of Color3 elements used to set different colors to the top, rings and bottom respectively
      * * faceUV an array of Vector4 elements used to set different images to the top, rings and bottom respectively
      * * hasRings when true makes each subdivision independantly treated as a face for faceUV and faceColors, optional, default false
      * * enclose when true closes an open cylinder by adding extra flat faces between the height axis and vertical edges, think cut cake
      * * sideOrientation optional and takes the values : Mesh.FRONTSIDE (default), Mesh.BACKSIDE or Mesh.DOUBLESIDE
      * * frontUvs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the front side, optional, default vector4 (0, 0, 1, 1)
      * * backUVs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the back side, optional, default vector4 (0, 0, 1, 1)
     * @returns the VertexData of the cylinder, cone or prism
     */
    public static CreateCylinder(options: { height?: number, diameterTop?: number, diameterBottom?: number, diameter?: number, tessellation?: number, subdivisions?: number, arc?: number, faceColors?: Color4[], faceUV?: Vector4[], hasRings?: boolean, enclose?: boolean, sideOrientation?: number, frontUVs?: Vector4, backUVs?: Vector4 }): VertexData {
        throw _DevTools.WarnImport("cylinderBuilder");
    }

    /**
     * Creates the VertexData for a torus
     * @param options an object used to set the following optional parameters for the box, required but can be empty
      * * diameter the diameter of the torus, optional default 1
      * * thickness the diameter of the tube forming the torus, optional default 0.5
      * * tessellation the number of prism sides, 3 for a triangular prism, optional, default 24
      * * sideOrientation optional and takes the values : Mesh.FRONTSIDE (default), Mesh.BACKSIDE or Mesh.DOUBLESIDE
      * * frontUvs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the front side, optional, default vector4 (0, 0, 1, 1)
      * * backUVs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the back side, optional, default vector4 (0, 0, 1, 1)
     * @returns the VertexData of the torus
     */
    public static CreateTorus(options: { diameter?: number, thickness?: number, tessellation?: number, sideOrientation?: number, frontUVs?: Vector4, backUVs?: Vector4 }): VertexData {
        throw _DevTools.WarnImport("torusBuilder");
    }

    /**
     * Creates the VertexData of the LineSystem
     * @param options an object used to set the following optional parameters for the LineSystem, required but can be empty
     *  - lines an array of lines, each line being an array of successive Vector3
     *  - colors an array of line colors, each of the line colors being an array of successive Color4, one per line point
     * @returns the VertexData of the LineSystem
     */
    public static CreateLineSystem(options: { lines: Vector3[][], colors?: Nullable<Color4[][]> }): VertexData {
        throw _DevTools.WarnImport("linesBuilder");
    }

    /**
     * Create the VertexData for a DashedLines
     * @param options an object used to set the following optional parameters for the DashedLines, required but can be empty
     *  - points an array successive Vector3
     *  - dashSize the size of the dashes relative to the dash number, optional, default 3
     *  - gapSize the size of the gap between two successive dashes relative to the dash number, optional, default 1
     *  - dashNb the intended total number of dashes, optional, default 200
     * @returns the VertexData for the DashedLines
     */
    public static CreateDashedLines(options: { points: Vector3[], dashSize?: number, gapSize?: number, dashNb?: number }): VertexData {
        throw _DevTools.WarnImport("linesBuilder");
    }

    /**
     * Creates the VertexData for a Ground
     * @param options an object used to set the following optional parameters for the Ground, required but can be empty
     *  - width the width (x direction) of the ground, optional, default 1
     *  - height the height (z direction) of the ground, optional, default 1
     *  - subdivisions the number of subdivisions per side, optional, default 1
     * @returns the VertexData of the Ground
     */
    public static CreateGround(options: { width?: number, height?: number, subdivisions?: number, subdivisionsX?: number, subdivisionsY?: number }): VertexData {
        throw _DevTools.WarnImport("groundBuilder");
    }

    /**
     * Creates the VertexData for a TiledGround by subdividing the ground into tiles
     * @param options an object used to set the following optional parameters for the Ground, required but can be empty
      * * xmin the ground minimum X coordinate, optional, default -1
      * * zmin the ground minimum Z coordinate, optional, default -1
      * * xmax the ground maximum X coordinate, optional, default 1
      * * zmax the ground maximum Z coordinate, optional, default 1
      * * subdivisions a javascript object {w: positive integer, h: positive integer}, `w` and `h` are the numbers of subdivisions on the ground width and height creating 'tiles', default {w: 6, h: 6}
      * * precision a javascript object {w: positive integer, h: positive integer}, `w` and `h` are the numbers of subdivisions on the tile width and height, default {w: 2, h: 2}
     * @returns the VertexData of the TiledGround
     */
    public static CreateTiledGround(options: { xmin: number, zmin: number, xmax: number, zmax: number, subdivisions?: { w: number; h: number; }, precision?: { w: number; h: number; } }): VertexData {
        throw _DevTools.WarnImport("groundBuilder");
    }

    /**
     * Creates the VertexData of the Ground designed from a heightmap
     * @param options an object used to set the following parameters for the Ground, required and provided by MeshBuilder.CreateGroundFromHeightMap
      * * width the width (x direction) of the ground
      * * height the height (z direction) of the ground
      * * subdivisions the number of subdivisions per side
      * * minHeight the minimum altitude on the ground, optional, default 0
      * * maxHeight the maximum altitude on the ground, optional default 1
      * * colorFilter the filter to apply to the image pixel colors to compute the height, optional Color3, default (0.3, 0.59, 0.11)
      * * buffer the array holding the image color data
      * * bufferWidth the width of image
      * * bufferHeight the height of image
      * * alphaFilter Remove any data where the alpha channel is below this value, defaults 0 (all data visible)
     * @returns the VertexData of the Ground designed from a heightmap
     */
    public static CreateGroundFromHeightMap(options: { width: number, height: number, subdivisions: number, minHeight: number, maxHeight: number, colorFilter: Color3, buffer: Uint8Array, bufferWidth: number, bufferHeight: number, alphaFilter: number }): VertexData {
        throw _DevTools.WarnImport("groundBuilder");
    }

    /**
     * Creates the VertexData for a Plane
     * @param options an object used to set the following optional parameters for the plane, required but can be empty
      * * size sets the width and height of the plane to the value of size, optional default 1
      * * width sets the width (x direction) of the plane, overwrites the width set by size, optional, default size
      * * height sets the height (y direction) of the plane, overwrites the height set by size, optional, default size
      * * sideOrientation optional and takes the values : Mesh.FRONTSIDE (default), Mesh.BACKSIDE or Mesh.DOUBLESIDE
      * * frontUvs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the front side, optional, default vector4 (0, 0, 1, 1)
      * * backUVs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the back side, optional, default vector4 (0, 0, 1, 1)
     * @returns the VertexData of the box
     */
    public static CreatePlane(options: { size?: number, width?: number, height?: number, sideOrientation?: number, frontUVs?: Vector4, backUVs?: Vector4 }): VertexData {
        throw _DevTools.WarnImport("planeBuilder");
    }

    /**
     * Creates the VertexData of the Disc or regular Polygon
     * @param options an object used to set the following optional parameters for the disc, required but can be empty
      * * radius the radius of the disc, optional default 0.5
      * * tessellation the number of polygon sides, optional, default 64
      * * arc a number from 0 to 1, to create an unclosed polygon based on the fraction of the circumference given by the arc value, optional, default 1
      * * sideOrientation optional and takes the values : Mesh.FRONTSIDE (default), Mesh.BACKSIDE or Mesh.DOUBLESIDE
      * * frontUvs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the front side, optional, default vector4 (0, 0, 1, 1)
      * * backUVs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the back side, optional, default vector4 (0, 0, 1, 1)
     * @returns the VertexData of the box
     */
    public static CreateDisc(options: { radius?: number, tessellation?: number, arc?: number, sideOrientation?: number, frontUVs?: Vector4, backUVs?: Vector4 }): VertexData {
        throw _DevTools.WarnImport("discBuilder");
    }

    /**
     * Creates the VertexData for an irregular Polygon in the XoZ plane using a mesh built by polygonTriangulation.build()
     * All parameters are provided by MeshBuilder.CreatePolygon as needed
     * @param polygon a mesh built from polygonTriangulation.build()
     * @param sideOrientation takes the values Mesh.FRONTSIDE (default), Mesh.BACKSIDE or Mesh.DOUBLESIDE
     * @param fUV an array of Vector4 elements used to set different images to the top, rings and bottom respectively
     * @param fColors an array of Color3 elements used to set different colors to the top, rings and bottom respectively
     * @param frontUVs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the front side, optional, default vector4 (0, 0, 1, 1)
     * @param backUVs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the back side, optional, default vector4 (0, 0, 1, 1)
     * @returns the VertexData of the Polygon
     */
    public static CreatePolygon(polygon: Mesh, sideOrientation: number, fUV?: Vector4[], fColors?: Color4[], frontUVs?: Vector4, backUVs?: Vector4): VertexData {
        throw _DevTools.WarnImport("polygonBuilder");
    }

    /**
     * Creates the VertexData of the IcoSphere
     * @param options an object used to set the following optional parameters for the IcoSphere, required but can be empty
      * * radius the radius of the IcoSphere, optional default 1
      * * radiusX allows stretching in the x direction, optional, default radius
      * * radiusY allows stretching in the y direction, optional, default radius
      * * radiusZ allows stretching in the z direction, optional, default radius
      * * flat when true creates a flat shaded mesh, optional, default true
      * * subdivisions increasing the subdivisions increases the number of faces, optional, default 4
      * * sideOrientation optional and takes the values : Mesh.FRONTSIDE (default), Mesh.BACKSIDE or Mesh.DOUBLESIDE
      * * frontUvs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the front side, optional, default vector4 (0, 0, 1, 1)
      * * backUVs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the back side, optional, default vector4 (0, 0, 1, 1)
     * @returns the VertexData of the IcoSphere
     */
    public static CreateIcoSphere(options: { radius?: number, radiusX?: number, radiusY?: number, radiusZ?: number, flat?: boolean, subdivisions?: number, sideOrientation?: number, frontUVs?: Vector4, backUVs?: Vector4 }): VertexData {
        throw _DevTools.WarnImport("icoSphereBuilder");
    }

    // inspired from // http://stemkoski.github.io/Three.js/Polyhedra.html
    /**
     * Creates the VertexData for a Polyhedron
     * @param options an object used to set the following optional parameters for the polyhedron, required but can be empty
     * * type provided types are:
     *  * 0 : Tetrahedron, 1 : Octahedron, 2 : Dodecahedron, 3 : Icosahedron, 4 : Rhombicuboctahedron, 5 : Triangular Prism, 6 : Pentagonal Prism, 7 : Hexagonal Prism, 8 : Square Pyramid (J1)
     *  * 9 : Pentagonal Pyramid (J2), 10 : Triangular Dipyramid (J12), 11 : Pentagonal Dipyramid (J13), 12 : Elongated Square Dipyramid (J15), 13 : Elongated Pentagonal Dipyramid (J16), 14 : Elongated Pentagonal Cupola (J20)
     * * size the size of the IcoSphere, optional default 1
     * * sizeX allows stretching in the x direction, optional, default size
     * * sizeY allows stretching in the y direction, optional, default size
     * * sizeZ allows stretching in the z direction, optional, default size
     * * custom a number that overwrites the type to create from an extended set of polyhedron from https://www.babylonjs-playground.com/#21QRSK#15 with minimised editor
     * * faceUV an array of Vector4 elements used to set different images to the top, rings and bottom respectively
     * * faceColors an array of Color3 elements used to set different colors to the top, rings and bottom respectively
     * * flat when true creates a flat shaded mesh, optional, default true
     * * subdivisions increasing the subdivisions increases the number of faces, optional, default 4
     * * sideOrientation optional and takes the values : Mesh.FRONTSIDE (default), Mesh.BACKSIDE or Mesh.DOUBLESIDE
     * * frontUvs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the front side, optional, default vector4 (0, 0, 1, 1)
     * * backUVs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the back side, optional, default vector4 (0, 0, 1, 1)
     * @returns the VertexData of the Polyhedron
     */
    public static CreatePolyhedron(options: { type?: number, size?: number, sizeX?: number, sizeY?: number, sizeZ?: number, custom?: any, faceUV?: Vector4[], faceColors?: Color4[], flat?: boolean, sideOrientation?: number, frontUVs?: Vector4, backUVs?: Vector4 }): VertexData {
        throw _DevTools.WarnImport("polyhedronBuilder");
    }

    // based on http://code.google.com/p/away3d/source/browse/trunk/fp10/Away3D/src/away3d/primitives/TorusKnot.as?spec=svn2473&r=2473
    /**
     * Creates the VertexData for a TorusKnot
     * @param options an object used to set the following optional parameters for the TorusKnot, required but can be empty
      * * radius the radius of the torus knot, optional, default 2
      * * tube the thickness of the tube, optional, default 0.5
      * * radialSegments the number of sides on each tube segments, optional, default 32
      * * tubularSegments the number of tubes to decompose the knot into, optional, default 32
      * * p the number of windings around the z axis, optional,  default 2
      * * q the number of windings around the x axis, optional,  default 3
      * * sideOrientation optional and takes the values : Mesh.FRONTSIDE (default), Mesh.BACKSIDE or Mesh.DOUBLESIDE
      * * frontUvs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the front side, optional, default vector4 (0, 0, 1, 1)
      * * backUVs only usable when you create a double-sided mesh, used to choose what parts of the texture image to crop and apply on the back side, optional, default vector4 (0, 0, 1, 1)
     * @returns the VertexData of the Torus Knot
     */
    public static CreateTorusKnot(options: { radius?: number, tube?: number, radialSegments?: number, tubularSegments?: number, p?: number, q?: number, sideOrientation?: number, frontUVs?: Vector4, backUVs?: Vector4 }): VertexData {
        throw _DevTools.WarnImport("torusKnotBuilder");
    }

    // Tools

    /**
     * Compute normals for given positions and indices
     * @param positions an array of vertex positions, [...., x, y, z, ......]
     * @param indices an array of indices in groups of three for each triangular facet, [...., i, j, k, ......]
     * @param normals an array of vertex normals, [...., x, y, z, ......]
     * @param options an object used to set the following optional parameters for the TorusKnot, optional
      * * facetNormals : optional array of facet normals (vector3)
      * * facetPositions : optional array of facet positions (vector3)
      * * facetPartitioning : optional partitioning array. facetPositions is required for facetPartitioning computation
      * * ratio : optional partitioning ratio / bounding box, required for facetPartitioning computation
      * * bInfo : optional bounding info, required for facetPartitioning computation
      * * bbSize : optional bounding box size data, required for facetPartitioning computation
      * * subDiv : optional partitioning data about subdivsions on  each axis (int), required for facetPartitioning computation
      * * useRightHandedSystem: optional boolean to for right handed system computation
      * * depthSort : optional boolean to enable the facet depth sort computation
      * * distanceTo : optional Vector3 to compute the facet depth from this location
      * * depthSortedFacets : optional array of depthSortedFacets to store the facet distances from the reference location
     */
    public static ComputeNormals(positions: any, indices: any, normals: any,
        options?: {
            facetNormals?: any, facetPositions?: any, facetPartitioning?: any, ratio?: number, bInfo?: any, bbSize?: Vector3, subDiv?: any,
            useRightHandedSystem?: boolean, depthSort?: boolean, distanceTo?: Vector3, depthSortedFacets?: any
        }): void {

        // temporary scalar variables
        var index = 0;                      // facet index
        var p1p2x = 0.0;                    // p1p2 vector x coordinate
        var p1p2y = 0.0;                    // p1p2 vector y coordinate
        var p1p2z = 0.0;                    // p1p2 vector z coordinate
        var p3p2x = 0.0;                    // p3p2 vector x coordinate
        var p3p2y = 0.0;                    // p3p2 vector y coordinate
        var p3p2z = 0.0;                    // p3p2 vector z coordinate
        var faceNormalx = 0.0;              // facet normal x coordinate
        var faceNormaly = 0.0;              // facet normal y coordinate
        var faceNormalz = 0.0;              // facet normal z coordinate
        var length = 0.0;                   // facet normal length before normalization
        var v1x = 0;                        // vector1 x index in the positions array
        var v1y = 0;                        // vector1 y index in the positions array
        var v1z = 0;                        // vector1 z index in the positions array
        var v2x = 0;                        // vector2 x index in the positions array
        var v2y = 0;                        // vector2 y index in the positions array
        var v2z = 0;                        // vector2 z index in the positions array
        var v3x = 0;                        // vector3 x index in the positions array
        var v3y = 0;                        // vector3 y index in the positions array
        var v3z = 0;                        // vector3 z index in the positions array
        var computeFacetNormals = false;
        var computeFacetPositions = false;
        var computeFacetPartitioning = false;
        var computeDepthSort = false;
        var faceNormalSign = 1;
        let ratio = 0;
        var distanceTo: Nullable<Vector3> = null;
        if (options) {
            computeFacetNormals = (options.facetNormals) ? true : false;
            computeFacetPositions = (options.facetPositions) ? true : false;
            computeFacetPartitioning = (options.facetPartitioning) ? true : false;
            faceNormalSign = (options.useRightHandedSystem === true) ? -1 : 1;
            ratio = options.ratio || 0;
            computeDepthSort = (options.depthSort) ? true : false;
            distanceTo = <Vector3>(options.distanceTo);
            if (computeDepthSort) {
                if (distanceTo === undefined) {
                    distanceTo = Vector3.Zero();
                }
                var depthSortedFacets = options.depthSortedFacets;
            }
        }

        // facetPartitioning reinit if needed
        let xSubRatio = 0;
        let ySubRatio = 0;
        let zSubRatio = 0;
        let subSq = 0;
        if (computeFacetPartitioning && options && options.bbSize) {
            var ox = 0;                 // X partitioning index for facet position
            var oy = 0;                 // Y partinioning index for facet position
            var oz = 0;                 // Z partinioning index for facet position
            var b1x = 0;                // X partitioning index for facet v1 vertex
            var b1y = 0;                // Y partitioning index for facet v1 vertex
            var b1z = 0;                // z partitioning index for facet v1 vertex
            var b2x = 0;                // X partitioning index for facet v2 vertex
            var b2y = 0;                // Y partitioning index for facet v2 vertex
            var b2z = 0;                // Z partitioning index for facet v2 vertex
            var b3x = 0;                // X partitioning index for facet v3 vertex
            var b3y = 0;                // Y partitioning index for facet v3 vertex
            var b3z = 0;                // Z partitioning index for facet v3 vertex
            var block_idx_o = 0;        // facet barycenter block index
            var block_idx_v1 = 0;       // v1 vertex block index
            var block_idx_v2 = 0;       // v2 vertex block index
            var block_idx_v3 = 0;       // v3 vertex block index

            var bbSizeMax = (options.bbSize.x > options.bbSize.y) ? options.bbSize.x : options.bbSize.y;
            bbSizeMax = (bbSizeMax > options.bbSize.z) ? bbSizeMax : options.bbSize.z;
            xSubRatio = options.subDiv.X * ratio / options.bbSize.x;
            ySubRatio = options.subDiv.Y * ratio / options.bbSize.y;
            zSubRatio = options.subDiv.Z * ratio / options.bbSize.z;
            subSq = options.subDiv.max * options.subDiv.max;
            options.facetPartitioning.length = 0;
        }

        // reset the normals
        for (index = 0; index < positions.length; index++) {
            normals[index] = 0.0;
        }

        // Loop : 1 indice triplet = 1 facet
        var nbFaces = (indices.length / 3) | 0;
        for (index = 0; index < nbFaces; index++) {

            // get the indexes of the coordinates of each vertex of the facet
            v1x = indices[index * 3] * 3;
            v1y = v1x + 1;
            v1z = v1x + 2;
            v2x = indices[index * 3 + 1] * 3;
            v2y = v2x + 1;
            v2z = v2x + 2;
            v3x = indices[index * 3 + 2] * 3;
            v3y = v3x + 1;
            v3z = v3x + 2;

            p1p2x = positions[v1x] - positions[v2x];          // compute two vectors per facet : p1p2 and p3p2
            p1p2y = positions[v1y] - positions[v2y];
            p1p2z = positions[v1z] - positions[v2z];

            p3p2x = positions[v3x] - positions[v2x];
            p3p2y = positions[v3y] - positions[v2y];
            p3p2z = positions[v3z] - positions[v2z];

            // compute the face normal with the cross product
            faceNormalx = faceNormalSign * (p1p2y * p3p2z - p1p2z * p3p2y);
            faceNormaly = faceNormalSign * (p1p2z * p3p2x - p1p2x * p3p2z);
            faceNormalz = faceNormalSign * (p1p2x * p3p2y - p1p2y * p3p2x);
            // normalize this normal and store it in the array facetData
            length = Math.sqrt(faceNormalx * faceNormalx + faceNormaly * faceNormaly + faceNormalz * faceNormalz);
            length = (length === 0) ? 1.0 : length;
            faceNormalx /= length;
            faceNormaly /= length;
            faceNormalz /= length;

            if (computeFacetNormals && options) {
                options.facetNormals[index].x = faceNormalx;
                options.facetNormals[index].y = faceNormaly;
                options.facetNormals[index].z = faceNormalz;
            }

            if (computeFacetPositions && options) {
                // compute and the facet barycenter coordinates in the array facetPositions
                options.facetPositions[index].x = (positions[v1x] + positions[v2x] + positions[v3x]) / 3.0;
                options.facetPositions[index].y = (positions[v1y] + positions[v2y] + positions[v3y]) / 3.0;
                options.facetPositions[index].z = (positions[v1z] + positions[v2z] + positions[v3z]) / 3.0;
            }

            if (computeFacetPartitioning && options) {
                // store the facet indexes in arrays in the main facetPartitioning array :
                // compute each facet vertex (+ facet barycenter) index in the partiniong array
                ox = Math.floor((options.facetPositions[index].x - options.bInfo.minimum.x * ratio) * xSubRatio);
                oy = Math.floor((options.facetPositions[index].y - options.bInfo.minimum.y * ratio) * ySubRatio);
                oz = Math.floor((options.facetPositions[index].z - options.bInfo.minimum.z * ratio) * zSubRatio);
                b1x = Math.floor((positions[v1x] - options.bInfo.minimum.x * ratio) * xSubRatio);
                b1y = Math.floor((positions[v1y] - options.bInfo.minimum.y * ratio) * ySubRatio);
                b1z = Math.floor((positions[v1z] - options.bInfo.minimum.z * ratio) * zSubRatio);
                b2x = Math.floor((positions[v2x] - options.bInfo.minimum.x * ratio) * xSubRatio);
                b2y = Math.floor((positions[v2y] - options.bInfo.minimum.y * ratio) * ySubRatio);
                b2z = Math.floor((positions[v2z] - options.bInfo.minimum.z * ratio) * zSubRatio);
                b3x = Math.floor((positions[v3x] - options.bInfo.minimum.x * ratio) * xSubRatio);
                b3y = Math.floor((positions[v3y] - options.bInfo.minimum.y * ratio) * ySubRatio);
                b3z = Math.floor((positions[v3z] - options.bInfo.minimum.z * ratio) * zSubRatio);

                block_idx_v1 = b1x + options.subDiv.max * b1y + subSq * b1z;
                block_idx_v2 = b2x + options.subDiv.max * b2y + subSq * b2z;
                block_idx_v3 = b3x + options.subDiv.max * b3y + subSq * b3z;
                block_idx_o = ox + options.subDiv.max * oy + subSq * oz;

                options.facetPartitioning[block_idx_o] = options.facetPartitioning[block_idx_o] ? options.facetPartitioning[block_idx_o] : new Array();
                options.facetPartitioning[block_idx_v1] = options.facetPartitioning[block_idx_v1] ? options.facetPartitioning[block_idx_v1] : new Array();
                options.facetPartitioning[block_idx_v2] = options.facetPartitioning[block_idx_v2] ? options.facetPartitioning[block_idx_v2] : new Array();
                options.facetPartitioning[block_idx_v3] = options.facetPartitioning[block_idx_v3] ? options.facetPartitioning[block_idx_v3] : new Array();

                // push each facet index in each block containing the vertex
                options.facetPartitioning[block_idx_v1].push(index);
                if (block_idx_v2 != block_idx_v1) {
                    options.facetPartitioning[block_idx_v2].push(index);
                }
                if (!(block_idx_v3 == block_idx_v2 || block_idx_v3 == block_idx_v1)) {
                    options.facetPartitioning[block_idx_v3].push(index);
                }
                if (!(block_idx_o == block_idx_v1 || block_idx_o == block_idx_v2 || block_idx_o == block_idx_v3)) {
                    options.facetPartitioning[block_idx_o].push(index);
                }
            }

            if (computeDepthSort && options && options.facetPositions) {
                var dsf = depthSortedFacets[index];
                dsf.ind = index * 3;
                dsf.sqDistance = Vector3.DistanceSquared(options.facetPositions[index], distanceTo!);
            }

            // compute the normals anyway
            normals[v1x] += faceNormalx;                         // accumulate all the normals per face
            normals[v1y] += faceNormaly;
            normals[v1z] += faceNormalz;
            normals[v2x] += faceNormalx;
            normals[v2y] += faceNormaly;
            normals[v2z] += faceNormalz;
            normals[v3x] += faceNormalx;
            normals[v3y] += faceNormaly;
            normals[v3z] += faceNormalz;
        }
        // last normalization of each normal
        for (index = 0; index < normals.length / 3; index++) {
            faceNormalx = normals[index * 3];
            faceNormaly = normals[index * 3 + 1];
            faceNormalz = normals[index * 3 + 2];

            length = Math.sqrt(faceNormalx * faceNormalx + faceNormaly * faceNormaly + faceNormalz * faceNormalz);
            length = (length === 0) ? 1.0 : length;
            faceNormalx /= length;
            faceNormaly /= length;
            faceNormalz /= length;

            normals[index * 3] = faceNormalx;
            normals[index * 3 + 1] = faceNormaly;
            normals[index * 3 + 2] = faceNormalz;
        }
    }

    /** @hidden */
    public static _ComputeSides(sideOrientation: number, positions: FloatArray, indices: FloatArray, normals: FloatArray, uvs: FloatArray, frontUVs?: Vector4, backUVs?: Vector4) {
        var li: number = indices.length;
        var ln: number = normals.length;
        var i: number;
        var n: number;
        sideOrientation = sideOrientation || VertexData.DEFAULTSIDE;

        switch (sideOrientation) {

            case VertexData.FRONTSIDE:
                // nothing changed
                break;

            case VertexData.BACKSIDE:
                var tmp: number;
                // indices
                for (i = 0; i < li; i += 3) {
                    tmp = indices[i];
                    indices[i] = indices[i + 2];
                    indices[i + 2] = tmp;
                }
                // normals
                for (n = 0; n < ln; n++) {
                    normals[n] = -normals[n];
                }
                break;

            case VertexData.DOUBLESIDE:
                // positions
                var lp: number = positions.length;
                var l: number = lp / 3;
                for (var p = 0; p < lp; p++) {
                    positions[lp + p] = positions[p];
                }
                // indices
                for (i = 0; i < li; i += 3) {
                    indices[i + li] = indices[i + 2] + l;
                    indices[i + 1 + li] = indices[i + 1] + l;
                    indices[i + 2 + li] = indices[i] + l;
                }
                // normals
                for (n = 0; n < ln; n++) {
                    normals[ln + n] = -normals[n];
                }

                // uvs
                var lu: number = uvs.length;
                var u: number = 0;
                for (u = 0; u < lu; u++) {
                    uvs[u + lu] = uvs[u];
                }
                frontUVs = frontUVs ? frontUVs : new Vector4(0.0, 0.0, 1.0, 1.0);
                backUVs = backUVs ? backUVs : new Vector4(0.0, 0.0, 1.0, 1.0);
                u = 0;
                for (i = 0; i < lu / 2; i++) {
                    uvs[u] = frontUVs.x + (frontUVs.z - frontUVs.x) * uvs[u];
                    uvs[u + 1] = frontUVs.y + (frontUVs.w - frontUVs.y) * uvs[u + 1];
                    uvs[u + lu] = backUVs.x + (backUVs.z - backUVs.x) * uvs[u + lu];
                    uvs[u + lu + 1] = backUVs.y + (backUVs.w - backUVs.y) * uvs[u + lu + 1];
                    u += 2;
                }
                break;
        }
    }

    /**
     * Applies VertexData created from the imported parameters to the geometry
     * @param parsedVertexData the parsed data from an imported file
     * @param geometry the geometry to apply the VertexData to
     */
    public static ImportVertexData(parsedVertexData: any, geometry: Geometry) {
        var vertexData = new VertexData();

        // positions
        var positions = parsedVertexData.positions;
        if (positions) {
            vertexData.set(positions, VertexBuffer.PositionKind);
        }

        // normals
        var normals = parsedVertexData.normals;
        if (normals) {
            vertexData.set(normals, VertexBuffer.NormalKind);
        }

        // tangents
        var tangents = parsedVertexData.tangents;
        if (tangents) {
            vertexData.set(tangents, VertexBuffer.TangentKind);
        }

        // uvs
        var uvs = parsedVertexData.uvs;
        if (uvs) {
            vertexData.set(uvs, VertexBuffer.UVKind);
        }

        // uv2s
        var uv2s = parsedVertexData.uv2s;
        if (uv2s) {
            vertexData.set(uv2s, VertexBuffer.UV2Kind);
        }

        // uv3s
        var uv3s = parsedVertexData.uv3s;
        if (uv3s) {
            vertexData.set(uv3s, VertexBuffer.UV3Kind);
        }

        // uv4s
        var uv4s = parsedVertexData.uv4s;
        if (uv4s) {
            vertexData.set(uv4s, VertexBuffer.UV4Kind);
        }

        // uv5s
        var uv5s = parsedVertexData.uv5s;
        if (uv5s) {
            vertexData.set(uv5s, VertexBuffer.UV5Kind);
        }

        // uv6s
        var uv6s = parsedVertexData.uv6s;
        if (uv6s) {
            vertexData.set(uv6s, VertexBuffer.UV6Kind);
        }

        // colors
        var colors = parsedVertexData.colors;
        if (colors) {
            vertexData.set(Color4.CheckColors4(colors, positions.length / 3), VertexBuffer.ColorKind);
        }

        // matricesIndices
        var matricesIndices = parsedVertexData.matricesIndices;
        if (matricesIndices) {
            vertexData.set(matricesIndices, VertexBuffer.MatricesIndicesKind);
        }

        // matricesWeights
        var matricesWeights = parsedVertexData.matricesWeights;
        if (matricesWeights) {
            vertexData.set(matricesWeights, VertexBuffer.MatricesWeightsKind);
        }

        // indices
        var indices = parsedVertexData.indices;
        if (indices) {
            vertexData.indices = indices;
        }

        geometry.setAllVerticesData(vertexData, parsedVertexData.updatable);
    }
}