I'm a novice at Blender.

I started using a program called 3d Slicer for medical images. It takes a medical scan (CT, MRI etc) and allows you to turn it into a 3d image (in this case .obj file for Procreate to read).

I'd like to get it to where I can paint on these objects in Procreate but if you look at my images, you'll see the problem.

This is my (admittedly weird) workflow:

Create the .obj file in 3d Slicer. Import it into Forger (a sculpting app) because Procreate won't take the file as-is, I have to follow some other instructions to fix the UV wrapping. Then I open it in procreate and get the mess you see in my last image when I try to paint. Without paint, it looks great!

So I imported it into Blender and tried limited dissolve (you'll see the results in the images) and then tried voxel remesh but it completely crashes with that.

Any advice on how to clean this up to take away that "can't paint on it cleanly" issue?

1 [.obj when imported]

2 [The mesh]

3 [The mesh with x-ray view]

4 [The mesh after applying limited dissolve]

5 [The problem - when I try to paint over it in procreate.]

  • $\begingroup$ Please add your images directly into your question rather than make folks go to an external web site to view them! meta.stackexchange.com/questions/75491/… $\endgroup$
    – John Eason
    Mar 21, 2023 at 0:25
  • $\begingroup$ After your limited dissolve - just to be sure, select the whole mesh and do a merge (M) by distance, then make sure the normals are pointed the right way (Shift+N). $\endgroup$ Mar 21, 2023 at 0:30
  • $\begingroup$ Try the decimate modifier, I'm always surprised at how good a job it does $\endgroup$
    – Psyonic
    Mar 21, 2023 at 7:44
  • 1
    $\begingroup$ DOn't use Limited DIssolve, instead try the Quad remesh and also re-unwrap (with the Smart UV Project option for example)? $\endgroup$
    – moonboots
    Mar 21, 2023 at 8:22
  • $\begingroup$ If Blender is already in the pipeline, why not use it to paint the object right away? in my opinion, the painting problem may occur because of flipped normals. As mentioned by others, this can easily be fixed in Blender with a few keystrokes - go to edit mode, then [shift + N] $\endgroup$
    – maddes8cht
    Mar 21, 2023 at 9:09

1 Answer 1


Use the Remesh > Quadriflow Remesh tool, choose the desired number of faces, once done unwrap your object with the Smart UV Project option:

enter image description here


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