Actually, we can have UVW(Vector 3) or UVWT(Vector 4) to be stored in UV attribute.
But in Unity, I only can access the first two attribute(U and V), other information I stored all becomes 0.

I find Houdini Engine only convert uv attribute to Vector2 variable, which will lose the uv.2, uv.3 data obviously.
I try to change some code, and it works well, now I can read uv.2 data in shader correctly. I think Houdini Engine need to support the Vector4 for uv attribute, which is quite useful for especially VFX stuffs.

I've logged this as an RFE. Will reply once it has been added.

In tomorrow's build, when importing meshes, UVs of tuple size 2, 3, and 4 will be supported, as well as UV sets from 1 to 8 (i.e. uv, uv2, uv3, …, uv8).

seelan
In tomorrow's build, when importing meshes, UVs of tuple size 2, 3, and 4 will be supported, as well as UV sets from 1 to 8 (i.e. uv, uv2, uv3, …, uv8).

Thanks, I really appreciate your quick support.