Three.js -多材质平面

Question

我正在尝试在一个平面上使用多种材质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质索引：

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);

但是我总是在着色器中得到一大堆错误，或者如果我使用MeshBasicMaterial而不是FaceMaterial，只会得到一个全红色的平面。我做错了什么？

Answer 1

要获得具有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:针对three.js r.60更新