Glass is a shader with built-in optical physics and properties ready to produce realistic glasses.Its main features include reflection-refraction color weightening, reflectivity autobalance based on refraction, internal volume ray calculation, color opacity based on objects volume, Bruster angle calculation and optional extra rays rendering.
RTShadow™:
You can consider this shader a sort of interface to control raytraced
shadows. With this shader you will be able to fake soft-edged shadows
without render time penalty, place color on the raytraced shadows and
control its saturation, darkness, dropoff, cover area.... A must-have
shader.
The RTS package comes with 3 simple shaders ready to tweak color, ambient and shapes of objects separately. This 3 shaders are a great (and fast!) help combined with Glass and RTShadow shaders, and round-up all the features of the RTS package.