Hi, I’m working on a model viewer for a Sega Saturn game, and i encounter an issue of texture deformation on faces. The Sega Saturn doesn’t use triangles but quads to generate faces and each face has its own texture (no uv mapping, non indexed vertices). [Capture d’écran 2024-06-26 à 19.27.41] …

Yes, it’s a threejs app. Indeed it seems to be a problem with perspective correct texture, but if it’s a feature to enable, i don’t know where :confused: This post is dated 2021 and seems to be related, is an option to manage this available since? (i don’t know if it’s important, but i use non in…

The issue you’re describing is exactly the one that’s covered in the thread you linked to, which I started back then. [image] Ryudo: is an option to manage this available since? Not that I’m aware of. unfortunately.

Did you find a correct solution since? As manthrax said, i’m surprised that there’s not an implemented option to manage this specific case as it seems to occurs often.

Have a look at this discussion of the same topic. Apparently the designers of Three.js deliberately decided to drop support for QUADS, which is at the heart of the issue. I still believe, the issue could be overcome through shaders, but I’m thoroughly unexperienced in writing those, and my various …

Whether its a quad, or 2 triangles shouldn’t matter. Perpective correct texture mapping is the default. It may be that your viewer is doing the projection on the software side and you’re only displaying the already transformed and projected result which WILL NOT WORK. You have to feed threejs the r…

Yes i’ve also seen this discussion. I think the case of prisoner849 is a good start, i just need to figure how can i adapt his solution with vertices instead of control points (it seems that the deformation applied to the plane with the control points is the exact deformation used on the Sega Saturn…

At first, i was just quickly asking if someone had this issue. As all the data (vertices, indices, textures etc.) are in a ISO file that i read and decompile, it’s a bit complicated to isolate this specific case in a codepen, that’s why i didn’t create a working example, but i can totally do this.

Do you have a spec for the format? There might be an existing loader for it, or it might be easy to make one.

Texture deformation on 2 triangles face

Questions

manthrax June 27, 2024, 4:48am 2

Is this a threejs app?

It looks like somehow you don’t have perspective correct texture mapping enabled? which sounds impossible given modern rendering pipeline.

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Texture deformation on 2 triangles face

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