Babylon.js/src/Particles/babylon.solidParticle.ts

module BABYLON {

    export class SolidParticle {
        public idx: number = 0;                         // particle global index
        public color = new Color4(1.0, 1.0, 1.0, 1.0);  // color
        public position = Vector3.Zero();               // position
        public rotation = Vector3.Zero();               // rotation
        public rotationQuaternion: Quaternion;          // quaternion, will overwrite rotation
        public scaling = new Vector3(1.0, 1.0, 1.0);    // scaling
        public uvs = new Vector4(0.0, 0.0, 1.0, 1.0);   // uvs
        public velocity = Vector3.Zero();               // velocity
        public alive = true;                            // alive
        public isVisible = true;                        // visibility
        public _pos: number = 0;                        // index of this particle in the global "positions" array
        public _model: ModelShape;                      // model shape reference
        public shapeId: number = 0;                     // model shape id
        public idxInShape: number = 0;                  // index of the particle in its shape id
        public _modelBoundingInfo: BoundingInfo;        // reference to the shape model BoundingInfo object
        public _boundingInfo: BoundingInfo;             // particle BoundingInfo
        public _sps: SolidParticleSystem;               // reference to the SPS what the particle belongs to

        /**
         * Creates a Solid Particle object.
         * Don't create particles manually, use instead the Solid Particle System internal tools like _addParticle()
         * `particleIndex` (integer) is the particle index in the Solid Particle System pool. It's also the particle identifier.  
         * `positionIndex` (integer) is the starting index of the particle vertices in the SPS "positions" array.
         *  `model` (ModelShape) is a reference to the model shape on what the particle is designed.  
         * `shapeId` (integer) is the model shape identifier in the SPS.
         * `idxInShape` (integer) is the index of the particle in the current model (ex: the 10th box of addShape(box, 30))
         * `modelBoundingInfo` is the reference to the model BoundingInfo used for intersection computations.
         */
        constructor(particleIndex: number, positionIndex: number, model: ModelShape, shapeId: number, idxInShape: number, sps: SolidParticleSystem, modelBoundingInfo?: BoundingInfo) {
            this.idx = particleIndex;
            this._pos = positionIndex;
            this._model = model;
            this.shapeId = shapeId;
            this.idxInShape = idxInShape;
            this._sps = sps;
            if (modelBoundingInfo) {
                this._modelBoundingInfo = modelBoundingInfo;
                this._boundingInfo = new BoundingInfo(modelBoundingInfo.minimum, modelBoundingInfo.maximum);
            }
        }

        /**
         * legacy support, changed scale to scaling
         */
        public get scale(): Vector3 {
            return this.scaling;
        }

        public set scale(scale: Vector3) {
            this.scaling = scale;
        }

        /**
         * legacy support, changed quaternion to rotationQuaternion
         */ 
        public get quaternion(): Quaternion {
            return this.rotationQuaternion;
        }

        public set quaternion(q: Quaternion) {
            this.rotationQuaternion = q;
        }

        /**
         * Returns a boolean. True if the particle intersects another particle or another mesh, else false.
         * The intersection is computed on the particle bounding sphere and Axis Aligned Bounding Box (AABB)
         * `target` is the object (solid particle or mesh) what the intersection is computed against.
         */
        public intersectsMesh(target: Mesh | SolidParticle): boolean {
            if (!this._boundingInfo || !target._boundingInfo) {
                return false;
            }
            if (this._sps._bSphereOnly) {
                return BoundingSphere.Intersects(this._boundingInfo.boundingSphere, target._boundingInfo.boundingSphere);
            }
            return this._boundingInfo.intersects(target._boundingInfo, false);
        }
    }

    export class ModelShape {
        public shapeID: number;
        public _shape: Vector3[];
        public _shapeUV: number[];
        public _positionFunction: (particle: SolidParticle, i: number, s: number) => void;
        public _vertexFunction: (particle: SolidParticle, vertex: Vector3, i: number) => void;

        /**
         * Creates a ModelShape object. This is an internal simplified reference to a mesh used as for a model to replicate particles from by the SPS.
         * SPS internal tool, don't use it manually.  
         */
        constructor(id: number, shape: Vector3[], shapeUV: number[], posFunction: (particle: SolidParticle, i: number, s: number) => void, vtxFunction: (particle: SolidParticle, vertex: Vector3, i: number) => void) {
            this.shapeID = id;
            this._shape = shape;
            this._shapeUV = shapeUV;
            this._positionFunction = posFunction;
            this._vertexFunction = vtxFunction;
        }
    }
}