Via coordinates of the Base point and the vectors (X axis, Y axis) a plane can be exactly described. X axis and Y axis have to be perpendicular to each other.

The below figure exemplarily shows a reference plane according to adjoining settings.

	Note
	A fixed plane is always relative to the absolute coordinate system (the big one with the naming of main axes [not relevant in this example]). A reference plane always depends on its base plane. For a better understanding of the values to be set the small coordinate system of the referred plane is decisive.

The reference plane "Reference plane 2" is moved by a Y value of -15. Reference point for this is the coordinate system of the initial plane (in this figure the right one)

Condition: The creation of the reference plane can be made dependent on a condition.