bevy/crates/bevy_gltf
Johannes Hackel 3f5a090b1b
Add UV channel selection to StandardMaterial (#13200)
# Objective

- The StandardMaterial always uses ATTRIBUTE_UV_0 for each texture
except lightmap. This is not flexible enough for a lot of gltf Files.
- Fixes #12496
- Fixes #13086
- Fixes #13122
- Closes #13153

## Solution

- The StandardMaterial gets extended for each texture by an UvChannel
enum. It defaults to Uv0 but can also be set to Uv1.
- The gltf loader now handles the texcoord information. If the texcoord
is not supported it creates a warning.
- It uses StandardMaterial shader defs to define which attribute to use.

## Testing

This fixes #12496 for example:

![wall_fixed](https://github.com/bevyengine/bevy/assets/688816/bc37c9e1-72ba-4e59-b092-5ee10dade603)

For testing of all kind of textures I used the TextureTransformMultiTest
from
https://github.com/KhronosGroup/glTF-Sample-Assets/tree/main/Models/TextureTransformMultiTest
Its purpose is to test multiple texture transfroms but it is also a good
test for different texcoords.
It also shows the issue with emission #13133.

Before:

![TextureTransformMultiTest_main](https://github.com/bevyengine/bevy/assets/688816/aa701d04-5a3f-4df1-a65f-fc770ab6f4ab)

After:

![TextureTransformMultiTest_texcoord](https://github.com/bevyengine/bevy/assets/688816/c3f91943-b830-4068-990f-e4f2c97771ee)
2024-05-13 18:23:09 +00:00
..
src Add UV channel selection to StandardMaterial (#13200) 2024-05-13 18:23:09 +00:00
Cargo.toml Implement clearcoat per the Filament and the KHR_materials_clearcoat specifications. (#13031) 2024-05-05 22:57:05 +00:00
README.md Add README.md to all crates (#13184) 2024-05-02 18:56:00 +00:00

Bevy glTF

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