Bump map exports with some kind of grid on.

[system]

Hello there…
Can someone help me…

I finished making bump-map in Zbrush, everything looks good in Z but when i try to render in MAYA i am start getting some seems or a grid if u will.
There is an option in Z, Fix Seems but it does not reel work. I load the texture and then use that option but nothing really happens, in MAYA i still see the same problem, maybe i am doing something wrong.

Any idea where is it coming from ?

I am adding an immage for u to take a loook at…

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[aurick]

I doubt that this is a problem with the export. Please check the settings in your rendering engine to make sure that all texture filtering (such as anti-aliasing or MIP-mapping) is turned off. Those algorithms by their very nature pull in data from the surrounding pixels, which tends to introduce artifacts like you show – they’re especially noticeable with bump maps and displacement maps.

If you continue to have trouble, could you please provide information about the model’s UV’s? For example, how were they assigned?

[system]

Here it is:

1. All UV’s where done in Z using UV_to_Texture. I’ve checked UV_Overlapping, everything was good, no problems there.
2. On the first image u can see BUMP in MAYA. If you look close then u will see small indentation in there, like there are some kind of lines, I tried to smooth them out using blur brush it did not help.
3. On the 2ned image u can see UV in Zbrush. There are also some black edges between the different colors, like some kind of a greed.
   4 On the 3ed image u can see the same texture but with BUMP shaider on and this is where the problem appears, using FIX seams does not really help. Even if i use it i can still see the grid and this is the problem because for some reason it also effects my original BUMP texture.
4. On the 4 image u can see the head with my bump map file on in Zbrush. There everything looks good, no seams no nothing i did not even know that I had a problem, only after i went to MAYA i saw it.

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[aurick]

You may need to ajust the UV’s slightly in the U and/or V direction. You’ll find settings for this in the Tool>Texture menu. Try values of + or - .05 and then click the Adjust button. It may take a few tries to find the correct values for your renderer, but once you have them you will be able to apply them to every texture before exporting to get a perfect fit every time.

[system]

Once i find the problem… Do i have to reexport the model with the texture or just the texture file ?

[aurick]

Just the texture. The adjustment doesn’t modify the UV’s. It simply adjusts the texture’s position slightly on the map.

Basically, UV coordinates read from 0,0 to 1,1 for a standard map. But not all rendering engines are exactly the same in how they register that 0,0 point. What ZBrush calls 0,0 another engine might actually call .05,-.05 or something similar.

With color maps, this slight misalignment is rarely noticeable. But bump and displacement maps are more sensitive.