Merge pull request #698 from agargaro/getScaleVector

Replace `extractMatrixScale` with `Vector3.setFromMatrixScale`

src/utils/ExtensionUtilities.js

@@ -108,7 +108,7 @@ function acceleratedMeshRaycast( raycaster, intersects ) {
 		tmpInverseMatrix.copy( this.matrixWorld ).invert();
 		ray.copy( raycaster.ray ).applyMatrix4( tmpInverseMatrix );
 
-		extractMatrixScale( this.matrixWorld, _worldScale );
+		_worldScale.setFromMatrixScale( this.matrixWorld );
 		direction.copy( ray.direction ).multiply( _worldScale );
 
 		const scaleFactor = direction.length();
@@ -206,15 +206,3 @@ export function disposeBoundsTree() {
 	}
 
 }
-
-// https://github.com/mrdoob/three.js/blob/dev/src/math/Matrix4.js#L732
-// extracting the scale directly is ~3x faster than using "decompose"
-function extractMatrixScale( matrix, target ) {
-
-	const te = matrix.elements;
-	const sx = target.set( te[ 0 ], te[ 1 ], te[ 2 ] ).length();
-	const sy = target.set( te[ 4 ], te[ 5 ], te[ 6 ] ).length();
-	const sz = target.set( te[ 8 ], te[ 9 ], te[ 10 ] ).length();
-	return target.set( sx, sy, sz );
-
-}