Bug in GGUI rendering

[kurt-rhee]

Describe the bug
When rendering many triangles in a scene, there can be an artifact.

If you export the points and render them in threejs there is no artifact.

To Reproduce

Rendering these vertices in the following zip files in GGUI will cause the issue on the right hand side of the screen

• you may need to adjust the position of the camera to see the artifact
• the artifact changes shape if you re-render the scene
• didn't happen in windows 10, happens in windows 11 and ubuntu 22.04

Meshes.zip

Log/Screenshots
Log is >1000 lines, discussion about the problem can be found in the discordgroup under support
https://discord.com/channels/1072391601097289748/1073213033100361820

$ python my_sample_code.py
[Taichi] mode=1.6.0
[Taichi] version 0.6.29, llvm 10.0.0, commit b63f6663, linux, python 3.10
...

Additional comments
Another thing I noticed which is less of an issue is that I get warnings when I have all of my vertices in float64 instead of float32

[jim19930609]

Hi @AntonioFerreras & @bobcao3 , it seems to be a bug with GGUI. Do you got a minute to take a look? It's not urgent though.