Any ideas what's causing those chunks of geometric artifacts? Argh.enter image description here

  • $\begingroup$ These may be overlapping faces of the model and so something like Z-fighting; or overlapping faces of the UV map. Try to W > Remove Doubles on the mesh and UVs > Pack Islands on UV map. $\endgroup$ – Mr Zak Nov 6 '15 at 0:47
  • $\begingroup$ Would help if we could look at the .blend $\endgroup$ – Mentalist Nov 6 '15 at 15:07
  • $\begingroup$ Thank you. The blend file is here: aworkofmarc.com/1/New_Barrel.blend $\endgroup$ – Marc Nov 6 '15 at 15:32
  • $\begingroup$ Related - blender.stackexchange.com/questions/5441/… $\endgroup$ – Mr Zak Nov 9 '15 at 16:36

Remove doubles in the mesh

What happens in your mesh now is Z-fighting. Notice the clipping while rotating view around the barrel:

enter image description here

While in Edit mode select all and press W > Remove Doubles. It will delete ~800 double vertices.

After that you can split normals either by adding Edge Split modifier or activating Auto Smooth in Object Data tab.

Also see:

Overlapping faces:

Cause of black artifacts in render?

Overlapping faces in mirror modifier causing z-fighting

Edge Split modifier vs. Auto Smooth:

How to smooth shade an object while retaining hard edges?


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