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Nepeta Leijon

https://blender.stackexchange.com/questions/47184/how-do-i-merge-material-slots

I viewed this and it still doesn't explain how to combine the textures together. I know it's possible because you did it with Nepeta and she has over ten, which isn't what Tower Unite allows. How did you do it?

https://steamcommunity.com/sharedfiles/filedetails/?id=1524367283

and when exporting? does the rig need to be the textures' parent or are they separate, because I'm getting a compile error.

use gimp or something, you have to export the eyeball textures into png and add on the circles yourself

yeah probably

When I use the VTFEdit, they just show up as squares. Do I make the circles manually?

Okay, so, first things first, when you rip the model from GMOD there is going to be an eye texture. It will not have the pupil texture.
What you have to do is go to an image-editing app, and add the pupil texture onto the eye texture - in this case it was just a black circle.
Then, in Blender, as the material of the eyes you set your new, edited eye texture.

... where did you do that? Blender? The Tower Unite tester?

The pupils are just a black circle added to the sprite