I am using the simplify brush with dynamic topology turned on, so that I can manually remesh my object, which is a head.

Everything works until I get to the ear, and try to reduce triangle density on the back of the ear (while leaving the front unchanged).

The problem I'm getting is that sometimes the brush punches through and starts operating on the far face. Even though I've checked "front faces only".

enter image description here

You can in the picture; I've been editing the back of the ear, and I've just turned it round to inspect the damage.

I'm guessing this is because the ear is thin?

Anyway, is there any way to prevent this?

  • $\begingroup$ Are all your normals correct? $\endgroup$ – gandalf3 Jan 5 '14 at 2:58
  • $\begingroup$ You should first figure out if this is a bug or not, (posting a sample blend would help) - or even just reporting this to blenders bug tracker. $\endgroup$ – ideasman42 Jan 5 '14 at 7:54

It can be a bug, or something in developement.

For you question: You can use various Mask tools / operations to temporally "block" the areas from being affected. For example, There is a brush type called Mask (or press M to switch to it), and also a menu category called Hide/Mask on the 3d View header when in Sculpt mode.

However, to quickly meet what you need, you can ShiftCtrlLMB to drag the block area (it will be shown in dark grey). Then just paint. When finishing, clear the mask by AltM.

enter image description here

enter image description here

  • $\begingroup$ What have you done to poor Suzanne!? ;) $\endgroup$ – gandalf3 Jan 5 '14 at 6:31
  • $\begingroup$ True, I'm feeling guilty, sorry... :P $\endgroup$ – Leon Cheung Jan 5 '14 at 6:32
  • $\begingroup$ I'm curious, what did you do in the top image? (for the weird deformations I mean, not the masking) $\endgroup$ – gandalf3 Jan 5 '14 at 6:41
  • 1
    $\begingroup$ W > Subdivide Smooth (x3). It got different result as a 3-level Subsurf modifier. Yes, a bit weird, probably caused by the different algorithm? A bit more tweak would be of more fun. :P $\endgroup$ – Leon Cheung Jan 5 '14 at 6:47

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