Display bug with the Sheen property of PBR materials

Hello everyone. I have a model. When I open Sheen, I export the model and import it into the sandbox again, but I find that the material flashes.

Sandbox preview

After importing again:

Please help me see what the reason is.

I cannot observe that behavior on my side.

We need to turn on the Sheen attribute for the material of the model, and then export it back to the sandbox again.

Its maybe a compression thing with the texture you are using?

No, only PNG type

The (Babylon) default configuration of sheen in PBR is not supported by glTF:

“Use roughness” is not checked, which means sheen will be applied without the roughness calculation. In glTF, roughness is always applied (when the sheen extension is used), which means that “Use Roughness” will be checked during import.

If you want parity between what you save and what you load into glTF, you need to check “Use roughness” before saving. In your case, checking “Use roughness” and setting the roughness to 1 is probably what you want.

Indeed