M | Model Element (T+ Model) | A Three Plus Model, Mesh, or Brep
Nm | Normal Map (Bitmap) | The texture to create a normal map. The RGB values affect the surface normal for each pixel fragment and change the way the color is lit. Normal maps do not change the actual shape of the surface, only the lighting. (A System Drawing Bitmap or full file path to an image.)
S | Normal Scale (Number) | How much the normal map affects the material 0-1.
