JXO

@tizian Yeah，I think you got it. stokes_basis() function is quite important in the implementation of mitsuba2, it simplifies interfaces of bsdf and structure of stokes. Frame is generated by coordinate_system()...

@eric1221bday see here, the comment equation is right. https://en.wikipedia.org/wiki/Schlick's_approximation Lerp definition: inline Float Lerp(Float t, Float v1, Float v2) { return (1 - t) * v1 + t * v2;...

@Xrayez modules may should be designed with dynamic loading, modules should be attached with dependency infos. Modules can be loaded or unloaded at runtime？More complicated but better to extend godot...