Mesh is invinsible after exporting model to Substance Painter

Question

Earlier today I tried to export my model to Substance Painter, after doing that I realized that a part of my model is invisible in the program.

After searching the web for a bit I found out that negative scale can make mesh invisible, and after checking my scale I found it that it is indeed negative in that specific part of the model.

Now, the problem is that if I change the scale the whole mesh is getting messed up. Is it possible to change the scale without messing the object or fiddling with it too much afterwards?

Blend file:

Edit

Upon further inspection, I also noticed that from different angles some parts are visible from the back but not from the front, it looks like a normal issue but as you can see from the blend files all the faces are facing the right direction

Hello, have you tried applying the scale ? Object > Apply > Scale — Gorgious, Jul 09 '21 at 15:33
You should also check Face Orientation view as part of inspecting a model. — Allen Simpson, Jul 09 '21 at 15:36
@AllenSimpson I've checked the face Orientation and it is fine, I'll check the post you've sent and the Scale thingy in a moment — user123, Jul 09 '21 at 15:59
@Gorgious well it seems that Scale didn't change anything after exporting — user123, Jul 09 '21 at 16:13

score 3 · Accepted Answer · answered Jul 09 '21 at 16:47

3

I just checked your model and you do have face orientation problems, the red area should be blue. In edit mode and with all selected go to Mesh > Normal > Recalculate outside.

After that, everything is fine

answered Jul 09 '21 at 16:47

Emir

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I just found out about it myself and was about to post an answer about it, but you were quicker ;)
Your reward is my thanks ( and accepted answer of course )
– user123 Jul 09 '21 at 16:49

Mesh is invinsible after exporting model to Substance Painter

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