javascript 是否有与three.js 等效的背面可见性？
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Is there a backface-visibility equivalent for three.js?
提问by Danny Garcia
I have an object with a mesh that uses a semi-transparent png texture.
我有一个使用半透明 png 纹理的网格对象。
Is there a flag or option for the MeshBasicMaterial so that the back of the object is visible through the front?
MeshBasicMaterial 是否有标志或选项，以便通过正面可以看到对象的背面？
Here is some sample code:
下面是一些示例代码：
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
})
]);
This will accurately render the sphere but the back remains invisible.
这将准确地渲染球体，但背面仍然不可见。
回答by rickdmer
The new way to do this is by using the sideproperty of material.
执行此操作的新方法是使用 的side属性material。
Example:
例子：
new THREE.MeshPhongMaterial( { map: texture, side: THREE.BackSide } )
Possible values are THREE.FrontSide, THREE.BackSideand THREE.DoubleSide.
可能的值为THREE.FrontSide、THREE.BackSide和THREE.DoubleSide。
回答by sole
The backface property is set in the mesh itself:
背面属性在网格本身中设置：
sphere.doubleSided = true;
