Hi folks, this is what I'm trying to accomplish: Making an asteroid space station with walls a different texture than the asteroid using boolean substraction.

I made my insides and corridor going outside using boolean union, that portion is a different texture than the base asteroid.  When I insert it into the asteroid and do my boolean substraction all my textures go default.  Is there a way the retain the different textures so that the walls, floor ceiling takes on the texture of the inserted part without attempting uv mapping?  I'm using Carrara 7 Pro.  Jan

No. Carrara doesn't use a "tag" texture system like some other software so boolean functions do not pass a "texture tag" to the resulting shape.

This is pretty easy to handle and re-map with the UV functions though. You will get greater control over UV stretching and so forth by doing it manually. This is really important if you will be using actual pixel based texture maps. 

You need to create a new surface fter the boolean.

Thanks guys, now I guess I got to tackle UV mapper again.  Dumb questions:  How do you do UV mapping manually vs clicking on make uv map and deciding (if C7 lets me) whether I do 6 sided etc?

--and define making a new surface after the boolean (unless it means figuring out what part of the uv map is for what part of the combined boolean).  I do know that the resulting combo is default grey wiping out everything. 

Again guys thanks for your quick replies.----Jan

Hi Jan,

You can use UV Mapper but I've found Carrara's UV toolset to be reasonably capable and that way you can skip importing/exporting geometry etc. 

With Carrara's UV you get two windows: Geometry and UV map. You can paint/select the polys in either window so making the selection is no big deal. You save the selection by name so you can recall it later to unwrap it or move it around. Not being able to see your shape, I can't recommend the best unwrap function. But do know that you can unwrap/display different selections with different unwrap modes and then scale, rotate and move them as needed. 

Depending on the detail required, you may want to designate different shading domains so you can create a larger UV map specifically for detail areas. Shading domains and different UV maps walk hand-in-hand.

Hi Mark, two windows.  Let me explore both.  Thanks.  Jan