Face Normals Issue

JordanCH2 · Apr 2019

So I'm currently working on a tank and have mirrored certain parts for the purpose of symmetry. I'm almost done with the UV's and wanted to test them in Substance Painter upon which I found the normals where inverted on the mirrored parts. I went back to Maya and Reversed them and re-imported and now the normals are okay but the geometry seems dark. If I turn my camera upside down however the effected is reversed unto the original mesh. When I turn on I-Ray no such graphical glitch occurs but then importing the meshes into UE4 the normals are inverted again.
Here are the examples, just on the cannons as it's quick and easy for me to adapt and make changes.

Original Import as I was working on it, the right cannon is dupicated and z scale-1 :

Image: https://us.v-cdn.net/5021068/uploads/editor/23/kpopgu58z8zp.png

After Flipping/Reversing the Normals, first on left is from usual angle, second is from below:

Image: https://us.v-cdn.net/5021068/uploads/editor/57/5gcb207o63e2.png

But when in I-Ray, no darkness:

Image: https://us.v-cdn.net/5021068/uploads/editor/tn/3v41i9z3wp9z.png

And to further confuse, in UE4:

Image: https://us.v-cdn.net/5021068/uploads/editor/pn/jc4quhdn3k2c.png

Any and all help/suggestions would be much appreciated as I really want to progress but also learn where/what I'd done incorrectly

Neox · Apr 2019

freeze your transformations, as you probably mirrored using using a negative scale this is the usual outcome

JordanCH2 · Apr 2019

Alright, will give that a shot on both types and will update.

JordanCH2 · Apr 2019

Excellent, seems to have done the job across all 3 Programs. I had deleted history but it seems I need to add Freeze transformations to the export prep mix as well. Thanks for the swift assist!

Will continue now and update if anything else goes wonky.

Face Normals Issue

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