# Rotation around the Z axis (looking to -Z: + turns counterclockwise, - clockwise)
	#
	# From the default camera point of view, looking down on the Z axis,
	# positive values turn `self` counterclockwise, and negative values clockwise.
	#
	# All actor rotations follow the right hand rule.
	# The default orientation of the model should look towards -Z.
	var roll = 0.0 is writable