Changing the color of a face in Three.js

I've been trying to change the color of a face, but I'm having trouble. When I use wireframe, it looks like it's working fine. However, when I don't use it, the face doesn't seem to render properly.

var geo = new THREE.Geometry();
geo.vertices.push(new THREE.Vector3(1, 1, 0));
geo.vertices.push(new THREE.Vector3(1, 0, 0));
geo.vertices.push(new THREE.Vector3(0, 0, 0));
geo.faces.push(new THREE.Face3(0, 1, 2));
geo.faces[0].color = new THREE.Color('rgb(0,255,0)');
var mesh = new THREE.Mesh(geo, new THREE.MeshBasicMaterial({
    vertexColors: THREE.FaceColors,
    color: 0xff0000//,
    //wireframe: true
}));
scene.add(mesh);

Check out the demo here: http://jsfiddle.net/yaxpberz/.

javascriptthree.js

Answer №1

After examining the vertex order when added to the face, it was discovered that the camera was actually pointing towards the back side of the mesh. To resolve this issue, the following solution can be implemented:

let mesh = new THREE.Mesh(geo, new THREE.MeshBasicMaterial({
    vertexColors: THREE.VertexColors,
    color: 0xff0000,
    side: THREE.BackSide
}));

Answer №2

To optimize performance, make sure you are adding vertices in a counter-clockwise order instead of clockwise. Consider switching the position of the first and third vertices to prevent drawing faces twice and reduce overhead.

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