M | Model Element (T+ Model) | A Three Plus Model, Mesh, or Brep
C | Color (Colour) | The material color
X | Roughness (Number) | How rough the material appears. (0.0 smooth mirror to 1.0 fully diffuse.)
R | Reflectivity (Number) | Degree of reflectivity, from 0.0 to 1.0.
M | Metalness (Number) | How much the material is like a metal. Non-metallic materials such as wood or stone use 0.0, metallic use 1.0, with nothing (usually) in between.
S | Sheen (Number) | The intensity of the sheen layer, from 0.0 to 1.0.
Sc | Sheen Color (Colour) | The color of the sheen layer
L | Clearcoat (Number) | Represents the intensity of the clear coat layer, from 0.0 to 1.0.
