I'll attach a model I've created with two components. A brick and mortar. However, when I try to join (Boolean Union) them into one mesh I can't seem to keep the two parts from becoming either all brick texture or mortar texture. Do I have to go in and edit the mesh properties post union and allocate a material to each surface? If so, how?

As you can see my model is a little unusaul but once I get it right, I will explain how it works.

I see how they work. But do you actually need them as one mesh? The main disadvantage to simply grouping them is all those wasted poly's "inside" the brick part. I'm not sure boolean union is the best way to get rid of those, tho. Be cleaner to make a cut a little inside the joint, then group. Sorry...I forgot what application you are using. Would be helpful.

Thanks nomuse. I'm using 3ds max and planned to remove the 'hidden' facets from the the mesh manually. I then wanted to apply the correct materials to the faces that had been assigned the wrong materials. I dislike grouped objects as they go 'funny' in some of my renders. However, I'm now looking at a slight variation on my model. What I wanted to acheive was a single model that can be used to create a large and varied range of walls.

• bilbo - Goto your modeling tab, use the polygon selection tools, select the polys, or faces, that you want. Then apply a material ID to those faces. You can then limit the texture to only those selected polys. Scan the web and look for some tutorials on the use of Max's Material ID system. It can be a bit confusing to use, but once you get the hang of it you'll discover that it is very powerful. Spaz....