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CAN'T CREATE UV maps

ZBrush Artworks
#1

Hello, I am a beginner and I love Zbrush but like every beginner I get stocked and I need your help.
I create my first model and I painted it. Now I am ready to create UVmaps to export the model and the texture. it is a simple model and I dont’ have subtool. I followed many different tutorials but it seems that my model is not reacting to any of the steps in the process of creating UV map.
The first problem is creating a low res model. My model is 2.748 mil points (its not heavy), I tried using decimation master but nothing happens. I also try to make a low res clone but nothing was happening. If I go to UVMaps>create AUVtiles a message appear: Optimal UV mapping can not be achieved with the current UVMap size and UV Map Border values. Also if I change those values it seems nothing is changing…

Now I am starting thinking that probably my model is not correctly set and if I am not able to discover whats wrong in my model structure I will never be able to pull it out from Zbrush.
I would really appreciate your help.
Thank you
Simonapost.jpeg

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#2

I think that particular UV option tries to dedicate at least 1 pixel’s worth of texture space to every polygon on the model.
For example, a 1024x1024 texture would have 1,048,576 pixels and so it could potentially contain that many UV islands… if not for the border value which tries to add extra padding around every uv shell (of which there will be MANY when you use AUV tiles). The higher the border value is (and you will want it to be high), the less room will be left on the texture for actual UVs.

What are you exporting the model for? In some instances you won’t even need UVs as other programs could potentially read the polypaint (vertex color) data from the model. If you do need a model with UVs, it might be better to:

  1. save the sculpt with just the polypaint data (no uvs)
  2. duplicate/clone the model
  3. retopologize this new clone (manually or even with zremesher) to a nice lowpoly model
  4. UV this new model (it'll have fewer polygons and will be a lot easier to work with)
  5. Either use zbrush to project the detail between these two models so you can create a map using zbrush, or export both models to a program like xnormal and use that to create the various texture maps instead