I'm really excited to play with the Copernicus texture import into Unreal. After some testing, only the Base Color, Roughness, and Normals maps are exported. Textures like Height and Emission do not. I have opened a Github Issue post as well.

https://github.com/sideeffects/HoudiniEngineForUnreal/issues/343 [github.com]

Hi,
Just replied to you on git:

Yes, that is expected, and indicated in the docs:
https://www.sidefx.com/docs/houdini/unreal/materials.html#generate [www.sidefx.com]

To generate materials from your HDA using a COP Preview Node:
Ensure the mesh generated in your HDA has UVs.
At the GEO/SOP level, add a COP Preview Node to your generated geometry.
Only some of the material channels will be translated to the Unreal material. See the below table for which ones.

At the moment, we support the same types of channels on the COP Preview node than the one we support on MATnets and older types of materia, for textures: only base color, metallic, specular, roughness, emissive color, opacity, normal.