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I've got a low poly character on Blender. I modelled it, unwrapped it and textured it with a Mirror modifier on, so that modelling and texturing was symmetrical. However, when I render it, a some of the vertices just... move, without percievable cause. This deforms the mesh, interrupts symmetry and noticeably displaces the texture, albeit only slightly. It is most noticeable in the face, whereby the eyeball on one side of the face begins to clip through the eyelid, whereas the other remains fine.

The issue is only observable when the mesh is rendered; it otherwise appears fine. When I switch between any regular viewport and a rendered viewport, I can see these particular vertices move away from their original, mirrored positions.

At first inspection, no part of the model is influenced by errant keyframes.

Any assistance greatly appreciated.

EDIT: I'm not sure how to upload a .blend just yet; I am working on it. Here are some before and after shots that hopefully demonstrate what I mean a little better.

EDIT 2: Here is a copy of the .blend file for your perusal. This iteration does not include the texture. The issue is observable when switching between rendered and non-rendered views of the mesh. ALee - Zombo Man

The before screenshot: Note the eye and general facial symmetry. The before screenshot: Note the eye and general facial symmetry.

After I hit render: The eye on our right has begun to clip through the eyelid. The area of the texture representing the jowls/dental sphere has also changed. I have deduced that the cheekbone/zygomatic arch has changed due to aforementioned vertex movement. The texture around the neck is also seeing deformation due to vertex movement. After I hit render: The eye on our right has begun to clip through the eyelid. The area of the texture representing the jowls/dental sphere has also changed. I have deduced that the cheekbone/zygomatic arch has changed due to aforementioned vertex movement. The texture around the neck is also seeing deformation due to vertex movement.

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  • $\begingroup$ Some screenshots would greatly impove your question, probably along with example .blend file with simplified copy of problem parts. It's unclear now whether you have invisible but renderable copy of mesh or double vertices or something else in the scene $\endgroup$ – Mr Zak Jul 9 '15 at 21:47
  • $\begingroup$ You can see this question for more info about adding .blend files. It seems in your case you wouldn't want to pack textures into your file, but here is link just for convenience $\endgroup$ – Mr Zak Jul 9 '15 at 22:34
  • $\begingroup$ Mr Zak - I have included the .blend under EDIT 2; thank you in advance for your response and assistance. It is greatly appreciated. $\endgroup$ – user15537 Jul 9 '15 at 23:00
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I'm not sure about this answer, but to me it looks like a calculation approximation problem: if you add a subsurf modifier to the body mesh, even with only 1 step of subsurf, everithing goes allright (then you can apply it, to get a pure mesh). Blender is not intended as CAD and your mesh is very low poly, maybe also adding some loopcuts would resolve your odd behaviour.

Consider that, generally, we use a circle of vertex for shaping the "hole" of eyes.

Hope it's useful.

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  • $\begingroup$ Your suggestion regarding the subsurf modifier was exactly what I was looking for; you have my most sincere gratitude! The issue has been fixed. Many thanks! $\endgroup$ – user15537 Jul 10 '15 at 1:33

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