@Ren_DOTA Hi, author of the patch here... I knew there was some pop-in, but have to admit I haven't played through the whole game with my own patch. So I underestimated the amount of peripheral character headlessness that would show up! Sorry about that
I did try to change the game's frustum culling, which would have fixed it, but had no luck at the time. I've had some more practice with reverse engineering since then, so might be able to try again at some point.
(Just in case anyone wants grain removal without a widescreen hack, that should work fine if you choose a 4:3 res in dgvoodoo2. The patch will use the right ratio for your dgvoodoo2 resolution setting, it's not hardcoded to 16:9)