layout (location = 0) in vec3 aPos;

uniform mat4 view;       // camera view without translation
uniform mat4 projection;

out vec3 Direction;

void main() {
    Direction   = aPos;
    vec4 pos    = projection * view * vec4(aPos, 1.0);
    gl_Position = pos.xyww;  // keeps the sky at depth 1.0
}