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As you can see below, these white faces only show in weight paint mode.

I had been getting random invisible faces whenever I imported the mesh into Unreal Engine 4, which had me stumped.

The white faces are all the faces that are invisible in UE4, I'm not sure what to do about it, short of redoing the mesh, and making a new uvmap..

Is this a bug? or am I just missing something simple? any help is appreciated, thanks.

white face bug in weight paint

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I've figured it out?!

For whatever reason choosing to open image, and bringing in the same texture I was using and reassigning my uv's to that fixed the problem.

The white faces have dissapeared.

Note: I did delete faces previously and make new ones, which were where the polygons had turned white. I don't understand why this whole thing happened because of that though..

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  • $\begingroup$ Did you try to reunwrap the hole mesh after deleting (and filling again?) faces? It could be that newly filled faces weren't asigned to the old UV map $\endgroup$ – Mr Zak Oct 23 '15 at 19:52
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Perhaps it's a problem with your normals?

Try selecting all the faces you're having trouble with, and turning on normals in the viewport to see if they're oriented outward properly.

enter image description here

(Press N if the panel isn't visible)

Ctr+N will do a quick recalculation of normals toward the "outside" of your mesh.

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  • $\begingroup$ I've tried recalculating the normals a couple times, checked them for what you've pictured above, everything looks just fine. $\endgroup$ – spellcat Oct 23 '15 at 18:10

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