Fixed. Finally, a nice view. Yoohoo! Now I am going to try to extract a texture: a "skin" image that should be rendered on top of the mesh. (9/N) - ThreadSky

ekatrukha.bsky.social • 17 days ago

Fixed. Finally, a nice view. Yoohoo!

Now I am going to try to extract a texture: a "skin" image that should be rendered on top of the mesh.
(9/N)

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ekatrukha.bsky.social•17 days ago

The texture object has four images, not one.
Eh?
Why four? Which one do I need? (10/N)

ekatrukha.bsky.social•17 days ago

To keep the thread cohesive, turns out there are four textures: 'base color', 'occlusive', 'metallic roughness' and 'emissive'. I think the last three are for the complex scattering/emissive materials.
I was able to extract "base color" and it looks ok, like expected "teddy bear skin" (11/N)

ekatrukha.bsky.social•17 days ago

The texture image includes recognizable fragments of band aids, applied to the model by its owner in an attempt to prevent 🧸 decomposition (12/N)

ekatrukha.bsky.social•17 days ago

Now I need to extract so-called UV coordinates, i.e. for each vertex, corresponding XY coordinates in the texture image. More buffer parsing (13/N)

ekatrukha.bsky.social•17 days ago

Almost there. Uploaded UV and texture to GPU and changed the shaders.
So it looks almost ok, I think UV mapping is correct, but the color is not, for some reason.
Need to figure out why it is so red now. Probably some stupid mistake somewhere. (14/N)

ekatrukha.bsky.social•17 days ago

oooh, it turns out the image is A B G R (in memory), but OpenGL expects R G B A byte order, doh.

So, after making almost every possible mistake, the final result is here!

I did not expect this to be finished in a day, yoohoo 🎆 (15/N)

senger.bsky.social•17 days ago

🤩

flevet.bsky.social•17 days ago

The 4 texture are 8 bits each? RGBA?

ekatrukha.bsky.social•17 days ago

At first I thought so too, but no. Investigation shows that all four images are RGB.
Turns out they are "base color", "emissive", "metallicRoughness" and "occlusion" textures. I think they made for more complex materials, I am going to get only "base color".

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