Add sprite.raycast support for scale,rotation,center

src/objects/Sprite.js

@@ -1,5 +1,6 @@
 import { Vector2 } from '../math/Vector2.js';
 import { Vector3 } from '../math/Vector3.js';
+import { Matrix4 } from '../math/Matrix4.js';
 import { Object3D } from '../core/Object3D.js';
 import { SpriteMaterial } from '../materials/SpriteMaterial.js';
 
@@ -29,18 +30,80 @@ Sprite.prototype = Object.assign( Object.create( Object3D.prototype ), {
 	raycast: ( function () {
 
 		var intersectPoint = new Vector3();
-		var worldPosition = new Vector3();
 		var worldScale = new Vector3();
+		var mvPosition = new Vector3();
 
-		return function raycast( raycaster, intersects ) {
+		var alignedPosition = new Vector2();
+		var rotatedPosition = new Vector2();
+		var viewWorldMatrix = new Matrix4();
+
+		var vA = new Vector3();
+		var vB = new Vector3();
+		var vC = new Vector3();
+
+		function transformVertex( vertexPosition, mvPosition, center, scale, sin, cos ) {
+
+			// compute position in camera space
+			alignedPosition.subVectors( vertexPosition, center ).addScalar( 0.5 ).multiply( scale );
+
+			// to check if rotation is not zero
+			if ( sin !== undefined ) {
+
+				rotatedPosition.x = ( cos * alignedPosition.x ) - ( sin * alignedPosition.y );
+				rotatedPosition.y = ( sin * alignedPosition.x ) + ( cos * alignedPosition.y );
+
+			} else {
+
+				rotatedPosition.copy( alignedPosition );
+
+			}
+
+
+			vertexPosition.copy( mvPosition );
+			vertexPosition.x += rotatedPosition.x;
+			vertexPosition.y += rotatedPosition.y;
+
+			// transform to world space
+			vertexPosition.applyMatrix4( viewWorldMatrix );
 
-			worldPosition.setFromMatrixPosition( this.matrixWorld );
-			raycaster.ray.closestPointToPoint( worldPosition, intersectPoint );
+		}
+
+		return function raycast( raycaster, intersects ) {
 
 			worldScale.setFromMatrixScale( this.matrixWorld );
-			var guessSizeSq = worldScale.x * worldScale.y / 4;
+			viewWorldMatrix.getInverse( this.modelViewMatrix ).premultiply( this.matrixWorld );
+			mvPosition.setFromMatrixPosition( this.modelViewMatrix );
+
+			var rotation = this.material.rotation;
+			var sin, cos;
+			if ( rotation !== 0 ) {
+
+				cos = Math.cos( rotation );
+				sin = Math.sin( rotation );
+
+			}
+
+			var center = this.center;
+
+			transformVertex( vA.set( - 0.5, - 0.5, 0 ), mvPosition, center, worldScale, sin, cos );
+			transformVertex( vB.set( 0.5, - 0.5, 0 ), mvPosition, center, worldScale, sin, cos );
+			transformVertex( vC.set( 0.5, 0.5, 0 ), mvPosition, center, worldScale, sin, cos );
+
+			// check first triangle
+			var intersect = raycaster.ray.intersectTriangle( vA, vB, vC, false, intersectPoint );
+
+			if ( intersect === null ) {
+
+				// check second triangle
+				transformVertex( vB.set( - 0.5, 0.5, 0 ), mvPosition, center, worldScale, sin, cos );
+				intersect = raycaster.ray.intersectTriangle( vA, vC, vB, false, intersectPoint );
+				if ( intersect === null ) {
+
+					return;
+
+				}
 
-			if ( worldPosition.distanceToSquared( intersectPoint ) > guessSizeSq ) return;
+			}
 
 			var distance = raycaster.ray.origin.distanceTo( intersectPoint );