same bump map to large and small uv maps

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  09 September 2013
same bump map to large and small uv maps

I try to explain this as good as possible. Im just curious hearing suggestions.

I have modelled a tall concrete building. And i have put it together with many separate pieces, a lot of wich is just basic cubes. I want to apply the same bump map pattern on most of the building, so first i have to uv map each piece. But when i do that, the bigger pieces have to have a larger map than the smaller ones, resulting in uneven bump map pattern if i apply the same bump to all of the pieces...so the only method i can think of is to make bump maps in different sizes. But it feels like i dont have a lot of controll if i do that...

Any advice?
 
  09 September 2013
or is it better to make all the uvs the same size as the biggest one, and just apply one big bump to all?
 
  09 September 2013
If you use Maya you could do it in 2 ways

- Use 3d noise texture. This is independent on UV. But you won't be able to animate your objects.

- Use UV sets
http://www.3dtotal.com/index_tutori...iled.php?id=195

If you're on MAX I can't help.
 
  09 September 2013
Thank you, i havent looked at 3d noise texture before but i will have a look now (i use maya).

Im wondering does it matters if the uv map is inside the upper right corner, or can i scale it outside of it (if i dont intend to do a snapshot)? I always read that it has to, but it dont seem to make a difference when i scale it outside. Can it give me some troubles which i cant see right away?
 
  09 September 2013
Your UVs need to use the same texel size. ie: apply a checker texture and make sure the checker pattern is the same size acrossed all objects. Bigger objects require a larger UV space, and smaller objects get a smaller UV space...the texture map should not change.
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  09 September 2013
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