I'm making elements for a modular scene for Unreal Engine and I would like to texture the walls using two different materials, one for the inner side and another one for the outter side. So, I have added a different material ID to every side.
![](https://us.v-cdn.net/5021068/uploads/editor/a3/g54c96cu6uy2.jpg)
The problem is... what's the best way to make the uv mapping and textures for this simple model?
I just can imagine these methods:
1. Make a single UV for the whole mesh and a texture that includes the inner and outer side. The problem of this method is that I need to make a texture for every combination of inner and outter side possible (interior1+exterior1, interior1+exterior2, interior2+exterior1, etc.).
![](https://us.v-cdn.net/5021068/uploads/editor/37/m0yz0s9tegcs.jpg)
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![](https://us.v-cdn.net/5021068/uploads/editor/5e/xq4d156dwre6.jpg)
2. Make a single UV for the whole mesh but every side will have its own texture.
![](https://us.v-cdn.net/5021068/uploads/editor/la/etuwuwa8ebda.jpg)
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![](https://us.v-cdn.net/5021068/uploads/editor/gq/xs7axzy6u8a4.jpg)
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![Image: https://us.v-cdn.net/5021068/uploads/editor/9a/0cquca552phj.jpg](https://us.v-cdn.net/5021068/uploads/editor/9a/0cquca552phj.jpg)
The problem of this method is that I waste lot of space in the UV.
3. Every side has its own UV and texture while all the wall is in a single mesh. I think this is the best way but I have never seen a model with two different UV in a single mesh. So I'm not sure if this is good or can cause some problems.
![](https://us.v-cdn.net/5021068/uploads/editor/i8/gmlhe05p973h.jpg)
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![Image: https://us.v-cdn.net/5021068/uploads/editor/73/8cjsefrd1cxk.jpg](https://us.v-cdn.net/5021068/uploads/editor/73/8cjsefrd1cxk.jpg)
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![](https://us.v-cdn.net/5021068/uploads/editor/nv/5wbcdd6s19r5.jpg)
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![](https://us.v-cdn.net/5021068/uploads/editor/5f/wa5f8frl6nw9.jpg)
4. The same than the previous method but every side it's in a different mesh. The problem of this method is that it will make the level design slower and complicated. Probably, I'll have snapping problems like this one:
![Image: https://us.v-cdn.net/5021068/uploads/editor/kh/l8qgzwlvjs0s.jpg](https://us.v-cdn.net/5021068/uploads/editor/kh/l8qgzwlvjs0s.jpg)
So, my question is, is there a better method to texture a wall with two sides that allows me to put a material to on side and another one to the another side inside Unreal Engine?
Replies
I forgot that sometimes I overlap UVs when doing symmetry (making both identical clusters/isles overlapped). My idea is to make several materials for the same wall and then assign them during the level design to make different type of walls with a single model.