Revert "Examples: Simplified webgl_nodes_loader_gltf_sheen."

This reverts commit ddaf9ea688ec051005341605d19b86ca357b3310.

examples/webgl_nodes_loader_gltf_sheen.html

@@ -65,6 +65,18 @@
 
 						scene.add( gltf.scene );
 
+						const object = gltf.scene.getObjectByName( 'SheenChair_fabric' );
+
+						// Convert to NodeMaterial
+						const material = NodeMaterial.fromMaterial( object.material );
+
+						const checkerNode = checker( mul( uv(), 5 ) );
+
+						material.sheenNode = mix( color( 0x00ffff ), color( 0xffff00 ), checkerNode );
+						material.sheenRoughnessNode = checkerNode;
+
+						object.material = material;
+
 					} );
 
 				renderer = new THREE.WebGLRenderer( { antialias: true } );