SpritePlugin: Use scale from matrixWorld. Fixes #5518.

src/renderers/webgl/plugins/SpritePlugin.js

@@ -11,7 +11,13 @@ THREE.SpritePlugin = function ( renderer, sprites ) {
 	var program, attributes, uniforms;
 
 	var texture;
-	
+
+	// decompose matrixWorld
+
+	var spritePosition = new THREE.Vector3();
+	var spriteRotation = new THREE.Quaternion();
+	var spriteScale = new THREE.Vector3();
+
 	var init = function () {
 
 		var vertices = new Float32Array( [
@@ -179,8 +185,10 @@ THREE.SpritePlugin = function ( renderer, sprites ) {
 			gl.uniform1f( uniforms.alphaTest, material.alphaTest );
 			gl.uniformMatrix4fv( uniforms.modelViewMatrix, false, sprite._modelViewMatrix.elements );
 
-			scale[ 0 ] = sprite.scale.x;
-			scale[ 1 ] = sprite.scale.y;
+			sprite.matrixWorld.decompose( spritePosition, spriteRotation, spriteScale );
+
+			scale[ 0 ] = spriteScale.x;
+			scale[ 1 ] = spriteScale.y;
 
 			var fogType = 0;
 
@@ -236,7 +244,7 @@ THREE.SpritePlugin = function ( renderer, sprites ) {
 		// restore gl
 
 		gl.enable( gl.CULL_FACE );
-		
+
 		renderer.resetGLState();
 
 	};