Scaling Normal Map like UV

mobpapst

Hey guys,

i wanted to create a bigger floor piece for an indoor szene. its kind of damaged concrete with cracks and so on. i took the lp from max loaded it into zbrush, sculpted it and baked a normal map out. its looks fine and worked good. but here is my problem.

i've a tiling texture for the floor but to get a good look i need to scale up the uv in max. the problem is now that my normal map isnt scaling up too. as i mentioned before i want to have the sculpted damage and cracks at the same position. the room isnt square at all

is there a way to scale my uv but keep the normal map as before?

i hope you get what i wanted to do.

EarthQuake

I'm confused as to what you're trying to do from your description, can you post some images to illustrate your problem and what you're trying to accomplish?

mobpapst

ok of course:

here is the lp with the normal mal from the sculpt:




When i unwrap my lp and fit it to the UV the normal map matches perfect. but i need to scale the UV to get the diffuse map in a higher tiling. when i scale the uv the normal map gets weird.

mobpapst

No one an idea?

Eric Chadwick

What is the final software you are sending the model to for rendering? Is it a particular game engine, like Unity or Unreal or CryEngine?

It sounds like you want to tile the diffuse, but not tile the normal map. If the engine allows you to create a custom shader, you can set it up to control the diffuse tiling separately from the normal map tiling, but still use the same UV set.

If not, you will need a shader that supports 2 UV channels. In 3ds Max, you would apply multiple UV channels. Note however that this will increase your vertex count in the game.

mobpapst

Finally it will come into Cryengine. So its possible in there to tile the diffuse without effecting the normal?

Eric Chadwick

It looks like CryEngine might not support this. I don't know for sure since I don't use it.
http://docs.cryengine.com/display/SDKDOC2/Texture+Maps#TextureMaps-TextureMapSub-menu-Filtering,Tiling,Rotating,Oscillating

However, it looks like you could use a Detail Map or else a Decal to do something similar.

http://docs.cryengine.com/display/SDKDOC2/Unified+Detail+Mapping

http://docs.cryengine.com/display/SDKDOC2/Texture+Maps#TextureMaps-Decal

sushi

another easy fix would be to reduce the resolution of the tiling diffuse texture. If you find tiling becomes noticeable then you could duplicate the low res texture to a higher res and add more detail.