I'm quite new to ThreeJS and I have a small issue (probably wrong usage). I'm trying to create a custom geometry and define the faces normals by myself.
I create one normal in one direction and the other one in the opposite direction, as my Mesh is not 2 sided I expect to see only one of the face, however I can see both of them... Any Idea of what I'm doing wrong ?
Thanks!
<body>
<script src="../build/Three.js"></script>
<script src="js/Stats.js"></script>
<script>
var container, stats;
var camera, scene, renderer;
container = document.createElement( 'div' );
document.body.appendChild( container );
scene = new THREE.Scene();
camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 2000 );
camera.up.x = 0;
camera.up.y = 0;
camera.up.z = 1;
camera.position.x = 300;
camera.position.y = -1000;
camera.position.z = 1000;
camera.lookAt(new THREE.Vector3(300, 250, 0));
scene.add( camera );
var light, geometry, material;
scene.add( new THREE.AmbientLight( 0x404040 ) );
light = new THREE.DirectionalLight( 0xffffff );
light.position.set( 0, 1, 0 );
scene.add( light );
material = new THREE.MeshBasicMaterial( { color: 0xFFFF00, wireframe: false, transparent: false, opacity: 1 } );
geometry = new THREE.Geometry();
geometry.vertices.push(new THREE.Vector3(0,0,0));
geometry.vertices.push(new THREE.Vector3(600,0,0));
geometry.vertices.push(new THREE.Vector3(0,-500,0));
geometry.vertices.push(new THREE.Vector3(600,-500,0));
var face;
face = new THREE.Face3(0,2,1);
face.normal.set(0,0,-1);
geometry.faces.push(face);
face = new THREE.Face3(2,3,1);
face.normal.set(0,0,1);
geometry.faces.push(face);
geometry.computeCentroids();
//geometry.computeFaceNormals();
//geometry.computeTangents();
var mesh = new THREE.Mesh(geometry, material);
scene.add(mesh);
renderer = new THREE.WebGLRenderer( { antialias: true } );
renderer.setSize( window.innerWidth, window.innerHeight );
container.appendChild( renderer.domElement );
renderer.render( scene, camera );
</script>
</body>
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