Zbrush polypaint pixalation on highest subdivsions

[system]

Hi all 1st post in these forums so iam really hoping some one can help me out in here (praying!)

Ok here is my problem, I have a model that I want to export the texture map from, I textured it all within Zbrush (using polypaint). My sub division lvls go up to 6 and I have used HD mode to polypaint and texture certain parts of the model also. However, when I now click “New From Polypaint” get these strange artifacts in my model as u can see in the screenshot below.

I have noticed though these strange artifacts mainly only appear on the areas whereby I applied the “Geometry HD”, oh I should probably mention that I divded my Geometry HD twice which got me around 38 million polys. I did while polypainting switch between HD sub 1 and 2 at times, because sometimes full hd was not needed, and it also gave me a larger area to texture with when only HD sub lvl 1

So if anyone can please let me know what these artifacts are and how I can get rid of them would be a great help to me, and I don’t want to go into Photoshop or what have you and manually have to paint all these artifacts out…

After a bit of experimenting I am able to paint over the strange looking artifacts, however they dont really go away, because as soon as I hit “New From Polypaint” it all appears once again :’(

Btw just to let you know I’am usng Zbrush 3.5R3 if that should makes any
difference…

[aurick]

Part of the problem may be due to the fact that your polypaint drastically exceeds the amount of detail that your texture can hold. A 4K map holds a maximum of 16 million data points. Your particular UV mapping is actually closer to 8-9 million usable pixels. So in order to transfer your polypaint to the texture ZBrush is having to discard about 75% of what you’ve painted. That may be what is creating the artifacts.

[system]

Hi Aurick, thanks for your reply sounds like a plausible answer to me

However sadly I was a little too impatient and went back a few steps in my saved files. Resulting in having to re-sculpt and texturing it all again before, all them strange anomalies appeared.

As a test though for future reference, I did try changing the map sizes from 6k to even 8k and was still facing the same issues. The strange thing is though if I only work at the highest HD sub division iam not getting any errors. Sadly though personally for my situation it’s a lot slower working this way as the area I can work on is a lot smaller and slows my pc down a fair bit

so I think in future in “geometry HD” I wont be using them sliders in between lvl 1 and 2 no more to prevent be developing similar sorts of issues further down the line

Anyway thankyou Aurick for you quick response, your input is valued highly as always!