[英]Is there a backface-visibility equivalent for three.js?
我有一个带有使用半透明png纹理的网格物体。
MeshBasicMaterial是否有一个标志或选项,以便可以从正面看到对象的背面?
这是一些示例代码:
var texture = THREE.ImageUtils.loadTexture('world.png');
// create the sphere's material
var sphereMaterial = new THREE.MeshBasicMaterial({
map: texture,
transparent: true,
blending: THREE.AdditiveAlpha
});
sphereMaterial.depthTest = false;
// set up the sphere vars
var radius = 50, segments = 20, rings = 20;
// create a new mesh with sphere geometry -
var sphere = new THREE.SceneUtils.createMultiMaterialObject(
new THREE.SphereGeometry(radius, segments, rings),[
sphereMaterial,
new THREE.MeshBasicMaterial({
color: 0xa7f1ff,
opacity: 0.6,
wireframe: true
})
]);
这样可以准确地渲染球体,但背面仍然不可见。
做到这一点的新方法是利用material
的side
特性。
例:
new THREE.MeshPhongMaterial( { map: texture, side: THREE.BackSide } )
可能的值为THREE.FrontSide
, THREE.BackSide
和THREE.DoubleSide
。
backface属性是在网格物体本身中设置的:
sphere.doubleSided = true;
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