Ugly grey spots on character: where they come from?

xantonx

Hi! I am pretty new to Godot, so sorry if it's a dumb question. I tried to enable/disable every feature in materials, but these grey spots don't go away. The only way to get rid of them is to turn make material "unshaded", but I don't want that.

Here's how they look like

Here is how it looks if I turn off shading (which shows that those gray stains don't come from the texture):

Where these stains come from and is there any way to disable them?

Megalomaniak

That looks like possibly a messed up normal map, what does it look like if you remove just the normal map and not all the shading?

Dschoonmaker

It could be a normal map, but I've actually had this problem with messed up normals. But you should try removing the normal map first, if you have one.

Megalomaniak

Yes, the normal map calculation might be thrown off by messed up mesh normals, that is another possibility.

xantonx

Removing normal maps don't help, but thanks for the general idea!

I used glTF to import this character from Blender. Now that I used Collada, those gray stains are gone. I will look into it more today to figure out at which point the normals were messed up (export or import).

Dschoonmaker

Did it look fine in blender? There should be some spots in blender if it was the normals, unless they got distorted on export/import.

xantonx

Dschoonmaker, yep, it's most probably import/export thing since changing the format fixes the problem. Didn't have time to look into it today, will try look into it tomorrow.

xantonx

I found the problem, after reverting this commit, my Blender exporter stopped messing up normals: https://github.com/KhronosGroup/glTF-Blender-IO/commit/57379578c85615fcafa1d532969100a4146bf285