javascript 更改立方体面的颜色
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Change the colors of a cube's faces
提问by David Gomes
I actually found thisquestion, but it says material.colordoesn't exist. I need to know how to change the colors of the various faces of a cube I'm drawing:
我实际上发现了这个问题，但它说不material.color存在。我需要知道如何更改我正在绘制的立方体各个面的颜色：
var newCube = new THREE.Mesh(new three.CubeGeometry(size, size, size), new three.MeshNormalMaterial({ vertexColors: three.FaceColors }));
回答by WestLangley
Here is how you set and change the colors of a cube's faces:
以下是设置和更改立方体表面颜色的方法：
var geometry = new THREE.BoxGeometry( size, size, size );
for ( var i = 0; i < geometry.faces.length; i ++ ) {
geometry.faces[ i ].color.setHex( Math.random() * 0xffffff );
}
var material = new THREE.MeshBasicMaterial( { color: 0xffffff, vertexColors: true } );
If geometry.faces[i].coloris changed after the geometry has been rendered, you must set geometry.colorsNeedUpdate = true. ( This is not required for canvasRenderer. )
如果在渲染几何体后geometry.faces[i].color更改，则必须设置geometry.colorsNeedUpdate = true. （这不是必需的canvasRenderer。）
three.js r.84
三.js r.84
回答by Wilt
Here is a fiddlefor people who end up here and want to see this code working.
对于最终来到这里并希望看到此代码工作的人来说，这是一个小提琴。
I made a box and tied 3 colors to the faces:
我做了一个盒子，在脸上绑了 3 种颜色：
// colors
red = new THREE.Color(1, 0, 0);
green = new THREE.Color(0, 1, 0);
blue = new THREE.Color(0, 0, 1);
var colors = [red, green, blue];
for (var i = 0; i < 3; i++) {
geometry.faces[4 * i].color = colors[i];
geometry.faces[4 * i + 1].color = colors[i];
geometry.faces[4 * i + 2].color = colors[i];
geometry.faces[4 * i + 3].color = colors[i];
}
The face colors are changed in the animateloop.
面部颜色在animate循环中更改。
Also check a related question herewith a great answerdemonstrating the use of material indices and groups on THREE.BufferGeometryinstances.
还可以在这里查看一个相关问题，其中有一个很好的答案，演示了在THREE.BufferGeometry实例上使用材料索引和组。
