[SOLVED] Imported fbx missing faces

Help & Support
1

I created a model of a coin to use in a sort of lottery scratch card game. Problem is, the fbx file is missing faces in places that don’t make sense to me. I used blender to make the model, and everything looks fine when I import the fbx back into blender. Help?

Here’s the project with the coin in it.
https://playcanvas.com/editor/scene/606098

2

Are the normals correct on those faces? Or are the faces completely missing?

3

The geometry for the coin is not well constructed. The faces on the ‘teeth’ around the edge of the coin are not planar. If I import the coin into Maya and triangulate the model, it’s fine (the triangulated coin is on the right):

image
image.jpg2741×1489 307 KB

Essentially:

  • Avoid creating non-planar polygons.
  • Try to weld mesh vertices where possible (avoid things like T-junctions in your mesh topology).
5

Triangulating the model seems to have fixed, and I’m not quite used to using blender yet. I only started using it a couple of weeks ago because I have the student version of Maya, and can’t use the models I make with it for non-school related projects.

As for the non-planar polygons, I hadn’t realized that had happened. Next time I try something like this I’ll add edges in to separate the faces.

All of the teeth where extruded from the flat face of the inner rim, which I guess is how the non-planar polygons were created. The lower surface of the coin was vertex welded to the teeth and rim however.

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