Apply MeshBasicMaterial to loaded obj+mtl with Three.js

Question

When I load obj+mtl+jpg data with Three.js, the material of the object is set to MeshLambertMaterial according to three.js document. If I want to change the material to another one such as MeshBasicMaterial, how can I do that?

The following code loads obj+mtl+jpg from my server and display the data with MeshLambertMaterial. I tried to apply MeshBasicMaterial with the following code (commented), but it failed and the object with displayed in white.

<!DOCTYPE html>
<html lang="ja">
<head><meta charset="UTF-8"></head>
<script src="http://threejs.org/build/three.min.js"></script>
<script src="http://threejs.org/examples/js/loaders/MTLLoader.js"></script>
<script src="http://threejs.org/examples/js/loaders/OBJMTLLoader.js"></script>
<body>
<div id="canvas_frame"></div>
    <script>
    var canvasFrame, scene, renderer, camera;
    canvasFrame = document.getElementById('canvas_frame');
    renderer = new THREE.WebGLRenderer();
    renderer.setSize( window.innerWidth, window.innerHeight );
    canvasFrame.appendChild( renderer.domElement );
    scene = new THREE.Scene();
    camera = new THREE.PerspectiveCamera( 50, window.innerWidth / window.innerHeight, 1, 1000 );
    camera.position.set(50,50,50);
    camera.lookAt( {x: 0, y: 0, z: 0} );
    var ambient = new THREE.AmbientLight(0xFFFFFF);
    scene.add(ambient);

    function animate() {
        renderer.render( scene, camera );
        requestAnimationFrame( animate );
    }

    function loadObjMtl(objUrl, mtlUrl, url, x, y, z){
          var loader = new THREE.OBJMTLLoader();
          loader.crossOrigin = 'anonymous';
          loader.load( objUrl, mtlUrl,
              function ( object ) {
                object.url = url; 
                object.position.set(x,y,z);

            object.traverse( function( node ) {
                if( node.material ) {
                    ////This doesn't work. How can I apply material for loaded obj?
                    //var material = new THREE.MeshBasicMaterial();
                    //if ( node instanceof THREE.Mesh ) {
                    //    node.material = material;
                    //}
                }
            });





                scene.add ( object ); 
            });
    }

    objUrl = "http://test2.psychic-vr-lab.com/temp/mesh_reduced.obj";
    mtlUrl = "http://test2.psychic-vr-lab.com/temp/mesh_reduced.mtl";
    loadObjMtl(objUrl,mtlUrl,"",0,0,0);

    animate(); 
    </script>

  </body>
</html>

pietro909 pietro909 · Accepted Answer · 2015-09-02T12:05:58

You see it totally white because you are not specifying any color for MeshBasicMaterial.

Try this:

var material = new THREE.MeshBasicMaterial({ color: 0xff0000 });

You'll see all red: it is working.

I think that you probably want to distinguish the different meshes, or apply any texture, do you?

Apply MeshBasicMaterial to loaded obj+mtl with Three.js

1 Answers