Multiple UV Sets - Arnold for Houdini
It is possible to use multiple UVs with Arnold. The image above has a tiled brick texture overlayed with a single graffiti texture.
Important:
This workflow is obsolete, multiple UVs are now translated automatically if they are named uv2, uv3, etc.
Creating UV Attributes
- To use multiple UV sets in Arnold, proceed as normal in Houdini but eventually, the UV set attributes need to be converted to vertex float attributes of size 2 in order to translate to Arnold POINT2 userdata.
- When using attribcreate to add a UV set it must be of class Point, size 2 with $UV1 and $UV2 as the values.
- After creation, the uvsets must be promoted from point to vertex attribute to be converted properly to indexed POINT2 userdata in Arnold.
- The UV sets must also be explicitly flagged for export in the Arnold properties of the geometry object.
Shading Network
- The UV set is assigned in the shading network by using the UV Set parameter of the image node.
