I think it is issue with assimp third-part lib. I debug the source code and find the second uv is wrong，I'm sure my model has the second uv. <img width="1831" height="1033" alt="Image" src="https://github.com/user-attachments/assets/fada7761-6896-4684-96e1-8ed5c9be7397" /> https://github.com/assimp/assimp/issues/5485
I think it is issue with assimp third-part lib.
I debug the source code and find the second uv is wrong，I'm sure my model has the second uv.
assimp/assimp#5485