面没有背上

Question

我有代码：

var roofGeometry = new THREE.Geometry(); 

roofGeometry.vertices.push(
    new THREE.Vector3(-0.5, 0, 0.5), 
    new THREE.Vector3(0.5, 0, 0.5), 
    new THREE.Vector3(0, 1, 0.5), 
    new THREE.Vector3(0.5, 0, -0.5), 
    new THREE.Vector3(0, 1, -0.5), 
    new THREE.Vector3(-0.5, 0, -0.5) 
); 
roofGeometry.faces.push(
    new THREE.Face3(0, 1, 2), 
    //new THREE.Face4(1, 3, 4, 2), 
    new THREE.Face3(5, 3, 4)/*, 
    new THREE.Face4(0, 5, 4, 2)*/ 
); 
//... 

http://jsfiddle.net/jFyFJ

为什么当我转动他们三角形disappering？

Answer 1

在材料的使用side: THREE.DoubleSide

jsfiddle