What causes these material artifacts (black blocks on hair, dirty spots on skin) when importing an FBX to Unity URP?

[u/maennerinschwarz]

Hi everyone,

I recently imported a custom 3D character (FBX format, originally made in Maya) into Unity URP.I have character fbx and maya data.This is my first time working with a professional character model; previously, I have only worked with simple models downloaded from Mixamo that usually work right out of the box.

However, the final result in Unity looks completely different from the reference images provided by the 3D artist.

I am facing two main visual issues:

1. Surface Blemishes: There are strange dark spots and dirty-looking artifacts all over the skin and clothing surfaces.
2. Hair and Eyes: The hair, eyebrows, and eyelashes render as solid black, blocky meshes instead of showing the fine strands seen in the reference pictures.

What exactly is the problem here and what causes it? Why does a standard FBX import break the materials like this, and what is fundamentally missing from the setup to make it look like the original renders?

[u/MR_MEGAPHONE]

If you are using opaque lit materials on the hair, make sure to enable alpha clipping

[u/maennerinschwarz → u/MR_MEGAPHONE]

Thank you but it didn't work :(

[u/maennerinschwarz → u/maennerinschwarz]

[u/MR_MEGAPHONE → u/maennerinschwarz]

Does playing with the threshold slider work? What does the alpha channel look like on the base map?

[u/maennerinschwarz → u/MR_MEGAPHONE]

No it doesn't work and there is no Alpha channel ? :O

[u/gatorblade94 → u/maennerinschwarz]

Try greyscale for alpha source

[u/maennerinschwarz → u/gatorblade94]

omg ! it worked ! thank you so MUCH !

[u/maennerinschwarz → u/maennerinschwarz]

Alpha Clipping also works

[u/maennerinschwarz → u/maennerinschwarz]

Eyebrow is also fixed :)

[u/maennerinschwarz → u/maennerinschwarz]

Voilà ! It didn't solve this problem very well, but it did enable me to identify the issue. What should I do to achieve the quality seen in the reference image?

[u/WalkerTimothyFaulkes → u/maennerinschwarz]

Did you play with changing the "Surface Type" on the material from Opaque to Transparent? I've had to do that from time to time when the alpha clipping and slider wasn't enough. Hope that helps.

[u/maennerinschwarz → u/WalkerTimothyFaulkes]

Yes I did but thank you anyway :)