ZBrushCentral

Problem getting a displacement from a sculped plane

ZBrush Usage Questions
#1

Hi everybody,

I’m trying to sculpt a ground surface on a plane, but I have a strange result when I generate the displacement and normal map.
Here’s what I’m doing:

  1. I create a plane 15x10 in Maya and create a planar UV layout
  2. Send the mesh to Zbrush 4 r2b (or import it as Obj, same result)
  3. Check the UV, and they look wrong, then I divide the mesh several times without the smt option
  4. Bake the polypaint -> and it works, the texture from polypaint is right !!
  5. Generate the displacement and normal map, and both get scaled to the center !!

I don’t get the problem if I’m using a 3 dimensional shape like a cube or a head etc.
I was looking around but couldn’t fine anyone with a similar problem, I just found an Eat3D tutorial on tilable textures but he uses the Grab brush.
Is it a problem with how Zbrush interpret planes ? Or am I missing something !

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#2

You can look at these for a potential answer. http://www.pixologic.com/docs/index.php/Special:Search?search=Displacement+maps&fulltext=Search

#3

ZBrush 4R2b??? That version is ancient history :lol:. You know, the uprades are free, the latest being 4R4 P2.

#4

If you manually scale your UVs in so that they don’t touch the 0:1 borders, is the result better?

#5

Thanks you all for your answers,

Doug -> I’ll definitely check the documents you linked

zber2 -> Zbrush r4 is giving me a different result.
In this case I used the Plane3D for a quick test, and used the UV Planar inside Zbrush. Color is baked into a texture fine, while the displacement get these straight lines, hwich are not correct.

Cryrid -> I was reading something about, maybe you are the same Cryrid on this thread http://www.polycount.com/forum/showthread.php?t=106583 I’ll check it later

Attachments

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#6

That looks like a result of the UV island touching the UV space borders. Go to ‘Tool > Texture Map’ and click ‘New From UV Check’. if you see any red, Zbrush doesn’t like your UV’s. Make sure none of the islands are touching the UV borders.

edit: In ‘Tool > UV Map’, ‘Uvc’, ‘Uvp’ and ‘Uvs’ don’t work very well. Don’t use those, but instead use ‘Unwrap’ in ‘UV Master’ plugin. That works much better. You can always check with ‘New From UV Check’ like I mentioned above.