Why do sometimes my sculpties get rendered black ?

The Symptom:

When you enter “Solid mode” suddenly parts of your object or the whole object turn black. Also when you try to bake surface textures you get black results.

The cause:

Your object has got its normals pointing in the wrong direction. This can happen when you mirrored your object along one axis or along all 3 axes. In that case all normals get fipped and thus you actually see (or better not see) the backside of the object surface.

The Workaround:

It is not sufficient to just “flip the normals”. This does not help at all because the sculptie baker does not take the normal data into account at all. What you will need to do is this:

  • go to edit mode
  • select all vertices
  • go to the uv editor
  • again select all vertices
  • now mirror the UV map along the x-axis: You can use “m” – “x” (“m” for Mirror and “x” for along the x-axis)
  • Rebake your sculptie
  • technically the problem is fixed by now, but the object still looks black. Although it won’t be of any concern you should fix that for consistency:
  • in edit mode: Mesh -> Normals -> Flip
  • Note: It seems as if nothing happened. This is most probably a bug in blender. It simply does not update the 3D view correctly after the flipping.
  • Force a 3D repaint by hitting the tab-key twice (go to object mode and return to edit mode) and the the problem shold be fixed.

Posted in: Sculpted Prims

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