So I used BlenderGIS to create something that looks like this but the topography is not sending to Rhino, it shows up as all white. I made sure to select the topography and export to OBJ with these settings:
In blender:
in rhino:
In rhino, I imported the .obj file
Do I need to also provide the .mtl file?
Yes.
How can I do this when importing the .obj file? Or do I attach the .mtl file afterwards?
The mtl file needs to be in the same folder as your OBJ file. Both are text files so open the MTL file in a (plain) text editor. Make sure that the path to the texture is relative.
Note that you of course also need the texture(s) for the material.
