M | Model Element (T+ Model) | A Three Plus Model, Mesh, or Brep
Sm | Sheen Map (Bitmap) | The RGB channels of this texture are multiplied against the Sheen Color, for per-pixel control over sheen tint. (A System Drawing Bitmap or full file path to an image.)
S | Sheen (Number) | The intensity of the sheen layer 0-1.
C | Sheen Color (Colour) | The sheen tint.
Rm | Sheen Roughness Map (Bitmap) | The alpha channel of this texture is multiplied against the Sheen Roughness, for per-pixel control over sheen roughness. (A System Drawing Bitmap or full file path to an image.)
R | Sheen Roughness (Number) | The effect factor between 0-1.
M | Model Element (T+ Model) | The updated Three Plus Model Element
