blue artifact

I sculpted with Dyntypo enabled, but then there appeared those strange blue artifacts. If I use the smooth brush, it minimize the problem, but some artifacts stay. Why does this happen? And how can I fix this?

Many thanks! And happy modeling :)

  • $\begingroup$ Thanks a lot :) I had strange bubbles of thausends of knoted vertices in the mesh, I don't know, how I have done this... At this stage i think it's the easiest to start new from scratch :D But thanks a lot :) $\endgroup$ Commented Apr 10, 2015 at 2:39
  • $\begingroup$ There have been several bug reports posted on the tracker over the past couple years because of this. Code-wise, nobody is sure how to fix it yet. :) $\endgroup$ Commented Apr 10, 2015 at 12:22
  • $\begingroup$ His brain exploded, its perfectly normal. $\endgroup$
    – ruckus
    Commented Apr 10, 2015 at 14:24

1 Answer 1


This is because of bleed through from the inner faces, facing the opposite direction. The darker color indicates the Normals direction. Try to never have interior faces near the sculpting surface while sculpting. If the hair is a separate object, you can completely remove inner faces, as they serve no purpose.

Sculpting Demonstration

Notice that you will have to do this before you begin sculpting, as sculpting directly affects changes to the mesh. In order to salvage your mesh, you will have to just clean up as carefully as possible, using the Smooth brush and such tools.

Sculpting repair

  • $\begingroup$ Thanks a lot! I ended up with strange bubbles of thausends of tangled vertices in the mesh... I don't know how I have done this by sculpting O.O But I will start from scratch for the hair! Thanks again, you are a lifesaver :D $\endgroup$ Commented Apr 10, 2015 at 2:41
  • $\begingroup$ No problem! I think the reason that the many bubbles were forming is that the previous strokes had made the two sides approach each other, and had subdivided them using Dynotopo, making it possible for the next action to affect both sides. However, the reversed normals (tells which way a face is facing) mean that the opposite side goes up instead of down, thus they intersected. $\endgroup$
    – J Sargent
    Commented Apr 10, 2015 at 2:44

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