Question

我试图在一架飞机上安装多种材料来制作一个简单的地形编辑器。所以我创建了几个材质，并尝试为我的平面中的每个顶点指定一个材料索引：

var materials = [];
materials.push(new THREE.MeshFaceMaterial( { color: 0xff0000 }));
materials.push(new THREE.MeshFaceMaterial( { color: 0x00ff00 }));
materials.push(new THREE.MeshFaceMaterial( { color: 0x0000ff }));
// Plane
var planegeo = new THREE.PlaneGeometry( 500, 500, 10, 10 );
planegeo.materials = materials;
for(var i = 0; i <  planegeo.faces.length; i++)
{
    planegeo.faces[i].materialIndex = (i%3);
}

planegeo.dynamic = true;
this.plane = THREE.SceneUtils.createMultiMaterialObject(planegeo, materials);

但是如果我使用MeshBasicMaterial而不是FaceMaterial，我总是在着色器中得到一大堆错误，或者只得到一个全红色的平面。任何帮助都很棒！

Answer 1

要获得三种颜色的棋盘图案，请执行以下操作：

// geometry
var geometry = new THREE.PlaneGeometry( 500, 500, 10, 10 );

// materials
var materials = []; 
materials.push( new THREE.MeshBasicMaterial( { color: 0xff0000 }) );
materials.push( new THREE.MeshBasicMaterial( { color: 0x00ff00 }) );
materials.push( new THREE.MeshBasicMaterial( { color: 0x0000ff }) );

// assign a material to each face (each face is 2 triangles)
var l = geometry.faces.length / 2;
for( var i = 0; i < l; i ++ ) {
    var j = 2 * i;
    geometry.faces[ j ].materialIndex = i % 3;
    geometry.faces[ j + 1 ].materialIndex = i % 3;
}

// mesh
mesh = new THREE.Mesh( geometry, new THREE.MeshFaceMaterial( materials ) );
scene.add( mesh );

编辑：更新为three.js r.60

Three.js - 多材料平面

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