WebGLRenderer: Handle roughnessMap/metalnessMap offset/repeat.

src/renderers/WebGLRenderer.js

@@ -1917,6 +1917,14 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 			uvScaleMap = material.bumpMap;
 
+		} else if ( material.roughnessMap ) {
+
+			uvScaleMap = material.roughnessMap;
+
+		} else if ( material.metalnessMap ) {
+
+			uvScaleMap = material.metalnessMap;
+
 		} else if ( material.alphaMap ) {
 
 			uvScaleMap = material.alphaMap;