Translucency
This parameter indicates the transparency of the material from the front and from the back.
Opacity
Sets the opacity of the surface.
Roughness
Sets the roughness of the surface for each side. Range is [0..1] where 1 is very rough,
Specular Level
Higher specular level makes the surface reflective and a lower specular level makes it more diffuse. Range is [0..1].
Occlusion Distance