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A more extensive test shows some kind of dropoff in performance after sculpting for a while. And you can see examples of using large brush sizes and how it cripples performance. Granted, we really should not be trying to make such edits on a dense mesh like this. It's a bit like trying to drive a nail with a wrecking ball...it's way overkill for such large form changes. That is one reason we have a Multi-Level Resolution featureset. Still, using large brushes shouldn't work that slow on a robust PC. Sphere Performance Test 02.mp4

Right off the bat, I see 2 potential things wrong here. One is that the density of the sphere is rather extreme (for what you are attempting to do), at 24 million, when trying to sculpt large scale edits such as huge extrusions. 24 million is the stage where you are sculpting much smaller details. This sphere should be no more than about 5 mill for such large extrusions. The other problem...at least it's a problem (longstanding issue with both sculpting and Texture Painting) for 3DCoat....is that performance generally sucks when using very large brush radius' like you use in the video. Reduce that radius in half and you will see a big difference. I have asked Andrew many times to please run a diagnostic test on application performance to see what the bottleneck is, when using large brush radius'. It doesn't matter if you have the biggest, fastest computer in the world...3DCoat will continue to struggle mightily with large brush radius'. It's some kind of fundamental, core bottleneck imposed by the application, where it just refuses to apply more pixels in a given radius, no matter how up-to-date your system is. I really wish Andrew and the staff could address this before anything else. Performance is often pretty robust in 3DCoat, but it has a few BIG weaknesses...including scene saving and loading (it was supposed to be faster, recently, but it is still very slow in my experience. I had to wait a few minutes to have this 26mill poly sphere At first, I had no issues, but after more extensive testing, I noticed the performance tended to drop off substantially. I don't know if that is a sign of a Memory leak, or the UNDO buffer getting too large or what...but I recently upgraded my system to an AMD Ryzen 9 9950X (16 core/32 thread) 192GB DDR 5 RAM (running at 5600mhz)...to try and help avoid such performance lags, but again, I find that some performance issues have no bearing on SYSTEM performance. It is something in the code that is holding it back, and has been for over 14yrs.    

1. Surface tools change density until voxels applied. This is sense of surface tools. They are faster, there is no vohelizing. 2. I am on Intel core i9, will seek for rizen... But performance is hard task. Too different brush engines.

The .fbx model is in the exchange folder (after Ptex), it should gave been brought back into Blender as the Per Pixel .fbx file.

nope Applinks is here C:\Users\<username>\Documents\AppLinks and the default 3dcoat docs folder is located on C:\Users\<username>\Documents\3DCoat   check this folders and delete the COAT_USER_PATH variable restart the comp and try again

Thanks for trying, can you please confirm if you have the C:/Documents directory with "3DCoat2025" and "AppLinks" folders inside? Or is my case special in this regard?

I am out of ideas, sorry.

C:\Program Files\3DCoat-2025 Didn't changed default settings

Do you have installed 3DCoat in the default installation drive C:\ ?

I do use OneDrive. Created the environment variable with exact "C:\Users\3dlog\Documents\My3DCoatData" directory, it changed the link in the relocation menu, but still creates C:/Documents folder even though it's only 17 bytes. Creates it every time, uninstall 3DCoat, installed it again with env variable, still same behavior, creates C:/Documents, Applink don't work. Changed variable to "C:\Users\3dlog\Documents\3DCoat". Nothing changes.

Maybe your comp have Onedrive installed ? (I am shooting in the dark trying to help) 3DCoat have issues with Onedrive installations   Issues with OneDrive installed “3DCoat” is trying to create a user data folder (which contains user settings and assets) inside “C:\Users\USER_NAME\OneDrive\???????\3DCoat”. That is incorrect. It should create it inside “C:\Users\USER_NAME\Documents\3DCoat”. To workaround this problem: Start > start typing “Edit the system environment variables” > Environment Variables… > System variables > New… > Variable name: COAT_USER_PATH Variable value: C:\Users\USER_NAME\Documents\My3DCoatData (specify your user name inside)

I still can't fix it and now I'm starting to lose my mind. Where should the preferences be stored? For some reason on first running it creates "C:/Documents" directory. There are only "3DCoat" and "AppLinks" folders inside. I already have two documents directories on my machine, I don't want third. Can it be confused somehow? Does everybody else have "C:/Documents" folder specifically for 3d coat? I've used "Relocate 3DCoat's Data", restart it, but it didn't fixed anything for Applink and just created the "3DCoat.txt" file in the "C:/Documents" with the link to new location. I delete it, and on starting 3dcoat it creates again, even though I've relocated prefs to regular documents in users folder. I've reinstalled the app a couple of times after cleaning all the directories and regs, but it still creates this cursed customized documents. I don't see any strange environment variables for it. Is it weird behavior, or is it just quirks of Coat and it works as it should?

Desktop 2025-10-26 00-02-36.mp4     also voxels are giving a strange grouping on polys , voxels use to disperse evenly over the mesh but now it groups them  

As I know... Blender does not have built-in support for Ptex.

Something else is wrong. If I send as Per-Pixel painting, And get back all is well.  But is I use Ptex Paint and use get back I have nothing. The .fbx file is in the exchange folder. I can export manually into Blender and I get the model but without the textures. When I import the .fbx file for the Per-Pixel painting I get the model along with the textures. I havent tested in modeling.

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