How to create billboard matrix in glm

Question

How to create a billboard translation matrix from a point in space using glm?

Answer 1

mat4 billboard(vec3 position, vec3 cameraPos, vec3 cameraUp) {
    vec3 look = normalize(cameraPos - position);
    vec3 right = cross(cameraUp, look);
    vec3 up2 = cross(look, right);
    mat4 transform;
    transform[0] = vec4(right, 0);
    transform[1] = vec4(up2, 0);
    transform[2] = vec4(look, 0);
    // Uncomment this line to translate the position as well
    // (without it, it's just a rotation)
    //transform[3] = vec4(position, 0);
    return transform;
}