New Material Type For Threejs

[ManishJu]

This material is a much better approximation for diffuse materials for dusty/porous surfaces that exhibits back-scattering and saturation effects that are missing from prior diffuse models like Lambert. It has a very low cost as compared to MeshStandard /MeshPhysical material. Can be used as a cheap alternative for surfaces like skin/clouds/pots...etc .

The method :

It has been directly taken from the recent 2021 paper : https://d1qx31qr3h6wln.cloudfront.net/publications/lambertsphereBRDF.pdf