Could this be because I’m using GM:S 1.4?
From the looks of it, I have only implemented this for GMS2, yeah
I could spend an hour or two adding this if you could provide a convincing argument for why you’re sticking to GMS1.x with current GM versions being free* and all
Edit: (checks profile) ah, a 3d game! Some of the d3d functions aren’t easy to port without caveats