I am very interested in the implementation of translucent and SSS materials in Babylon. I want to learn more about the principle behind it. Are there any related articles or blog to recommend?
cc @CraigFeldspar, he might be able to give you some pointers, as he implemented SSS in our PBR material!
Some of the glTF PBR extensions have background information that might be useful if you are looking for principles.
For example, the WIP KHR_materials_volume_scattering extension has information about scattering. We eventually will be implementing this in Babylon once the specification is stable.
There are references to papers in the spec that have lots of information.