Totally. 3D geometry is hard and when you're coding there are a bunch of different ways a minor error can mean absolutely nothing appears on the screen. Just le

Totally. 3D geometry is hard and when you're coding there are a bunch of different ways a minor error can mean absolutely nothing appears on the screen. Just learning about those different failure modes takes a while. The other thing I find (but maybe this is the same with node-based approaches too!) is that there are a bunch of arbitrary coin-flip choices you have to make when doing 3D (e.g. left-handed versus right-handed coordinates). At a fundamental level it doesn't matter which choice you make, but your decisions have to be consistent, otherwise things can get flipped around, or often just vanish entirely. The sneakiest problem is when you unknowingly make two wrong choices, and they mostly cancel out except for some weird edge cases that happen to exercise the exposed code path.