If I have an .glb-file with transmissionMap, should the transmissionMap work by now?
I know its kinda “flat” question, as I assume it should, but when I´m testing with an all black and/or all white transmissionMap and load-in the glb, even if the material is set transparent to true, it seems that the transmissionMap does nothing?
Yes, KHR_materials_transmission should be supported. Here is the official demo:
https://threejs.org/examples/webgl_loader_gltf_transmission
Can you please try to replace your asset in this example?
I would also suggest testing in a viewer like https://gltf-viewer.donmccurdy.com/. This will help tell you if the problem is related to the model, or to your code.
Like most PBR effects, transmission looks best with environment map lighting.
Thanks @Mugen87 @donmccurdy - both helped a lot. In my case it seems not be a problem with tranmissionMap at all but with Threejs its version I used before I actually npm three@latest
Now it works right out of the box!
@Mugen87 @donmccurdy the webgl_loader_gltf_transmission example has some sort of iridescence-effects on it, I guess coming from the env-mapping? Any plans we can have and use iridescence in PhysicalMaterial as value/map in the future as well?
I think that effect is coming from specularIntensity and specularTint on MeshPhysicalMaterial.