Merge pull request #664 from dongho-shin/dev/fix-materialAttributeIndex

Fix Material Index not matched

Author: gkjohnson

src/core/PathTracingSceneGenerator.js

@@ -178,12 +178,7 @@ export class PathTracingSceneGenerator {
 		const materials = result.materials;
 		const textures = getTextures( materials );
 		const { lights, iesTextures } = getLights( objects );
-
-		if ( result.changeType !== NO_CHANGE ) {
-
-			updateMaterialIndexAttribute( geometry, materials, materials );
-
-		}
+		updateMaterialIndexAttribute( geometry, materials, materials );
 
 		// only generate a new bvh if the objects used have changed
 		if ( this.generateBVH ) {

src/core/WebGLPathTracer.js

@@ -360,10 +360,10 @@ export class WebGLPathTracer {
 				geometry.attributes.color,
 			);
 
-			material.materialIndexAttribute.updateFrom( geometry.attributes.materialIndex );
-
 		}
 
+		material.materialIndexAttribute.updateFrom( geometry.attributes.materialIndex );
+
 		// save previously used items
 		this._previousScene = scene;
 		this.scene = scene;