I have one mesh with 2 uv channels, Not lightmaps, just two unwrapped textures with coordinates 0,0 and 0,1. I use maya. Mesh is rigged body.
In material settings i didn’t find the solution to apply two textures on one object.
I couldn’t detach one part from another. Because models of characters was rigged.
Second question about rigged models. After import some parts of my models is lost.
For example (maya) in outliner i has two groupes.
Character
Clothes
After import i see only character. Mesh with clothes has lost
I cant help you with the lost part stuff, but the uv channels both need to have materials. (Multisub material)
(you just assign shaders to selected faces for multi-subobject texturing.)
You can assign multiple materials inside the Details panel of the mesh. If you set up your mesh correctly, there should be multiple elements inside the Materials subheading, each corresponding to your separate UV channels.
In order to ensure that your mesh will have multiple elements for materials, make sure to set up separate materials in Maya before export. For example, set everything from UV set 1 to use lambert1 and everything from UV set 2 to use lambert2.