M | Model Element (T+ Model) | A Three Plus Model, Mesh, or Brep
Am | Alpha Map (Bitmap) | The alpha map is a grayscale texture that controls the opacity across the surface (black: fully transparent; white: fully opaque) (A System Drawing Bitmap or full file path to an image.)
O | Opacity (Number) | How transparent the material is. 0-1.
M | Model Element (T+ Model) | The updated Three Plus Model Element
