自定义几何体和面法线问题 [英] Issue with custom geometry and face normal
本文介绍了自定义几何体和面法线问题的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我对ThreeJS很新，我有一个小问题（可能是错误的用法）。我正在尝试创建一个自定义几何体并自己定义面法线。
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.
我在一个方向上创建一个法线而在另一个方向上创建另一个法线，就像我的网格不是双面的我希望看到只有一个面孔，但是我可以看到它们两个......对我做错了什么的想法？
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 ?
谢谢！
<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>
推荐答案
WebGLRenderer 使用您在其中创建面的顶点顺序来定义方向而不是法线。尝试这样做：
WebGLRenderer uses the vertex order in which you created the face for defining the orientation instead of the normal. Try doing this:
face = new THREE.Face3(2,1,3);
这篇关于自定义几何体和面法线问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
