getMainMaterial() {

		return this.getMaterial( MAIN_COLOUR_CODE );

	}
Returns the Material for the main LDraw color.

For an already loaded LDraw asset, returns the Material associated with the main color code.
This method can be useful to modify the main material of a model or part that exposes it.

The main color code is the standard way to color an LDraw part. It is '16' for triangles and
'24' for edges. Usually a complete model will not expose the main color (that is, no part
uses the code '16' at the top level, because they are assigned other specific colors) An LDraw
 part file on the other hand will expose the code '16' to be colored, and can have additional
fixed colors.

@return {?Material} The material. Returns `null` if no material has been found.