Wall rendering bug with portal at specific position

[Deconimus]

Version of the game

• latest
• (tested it with previous versions, also happens at e.g. c90b8ba)

Original Hardware or Emulator?

Emulator. Both Project64 3.0.1 and RMG 0.5.7

What is the bug?

Placing portals at specific locations at the very edge of a surface can cause rendering bugs for the surface. It almost looks like the surface is being re-triangulated around the portal with some faces becoming invisible/removed.

Steps to reproduce the behavior:

1. In test chamber04
2. Shoot Portal at right wall near the pit, right on the edge of the wall
3. See through the wall

hole_in_the_wall.mp4

[mwpenny]

Test chamber 4 is really proving to be a good map for finding issues.

I suspect the culprit here is the hole cutting logic for portal placement. The criteria seems rather specific - I tried in a few other chambers and couldn't reproduce there.

I won't be looking at this one right away given the low severity. In the mean time, feel free. Otherwise, there are some other enhancements I want to do to portal placement and I'll investigate then.

[Deconimus]

Test chamber 4 is really proving to be a good map for finding issues.

True. Here's another similar phenomenon I accidentally stumbled accross. Not sure if it's same issue, but looks like the inverse of the problem.

wall_in_the_hole.mp4

[mwpenny]

Yes, looks related. It's also a good idea to try on a more accurate emulator like Ares, but likely these are both real.