THREE.js - Billboard Vertex Shader

Question

I have the need to orientate an instance of THREE.Mesh to always face the camera. I know I could just use the [THREE.Mesh].lookAt() method, but I\'m trying to work on my GLS

Answer 1

Apparently this works:

gl_Position = projectionMatrix * (modelViewMatrix * vec4(0.0, 0.0, 0.0, 1.0) + vec4(position.x, position.y, 0.0, 0.0));

I'm actually trying to figure out how to do axis aligned billboards.