Extension KHR_materials_transmission

[atteneder]

Add support for KHR_materials_transmission

Full support is planned/investigated for Universal Render Pipe and High Definition Render Pipe.

The Built-In Render Pipe will receive an approximation solution without transmission roughness nor transmission texture support. It'll work for clear glass (100% transmission + white baseColor), but will fall back to a blended approximation for tinted glass.

[ponahoum]

Would be nice that have this feature added, with the support of this for tests: https://github.com/KhronosGroup/glTF-Sample-Models/tree/master/2.0/TransmissionTest

@atteneder is this planned in the short term?

[atteneder]

@ponahoum

There are approximations and make-shift solutions in place already. You can find the details in the material import section of the feature document.

Are those good enough for your use-cases and if not, why not?

Which render pipeline do you intend to use it with?

hth

[ponahoum]

@atteneder it seems that it works for my use case (which is simply to import a glass-window gltf) but I must manually set the blend mode to transparent to make it work. I thought it would do it automatically on import.

[atteneder]

@ponahoum It definitely should work out of the box! I've made some material fixes recently. Could you please test again and open a new issue if the problem persists? Thanks!