A plane can be described exactly using the coordinates under the point of origin [Base point] and the two vectors (x-axis [X axis], y-axis [Y axis] ). The x-axis [X axis] and y-axis [Y axis] must be perpendicular to each other

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

	Note
	An absolute plane is always relative to the absolute coordinate system (the large one with the designation of the main axes [not relevant here in the example]). A reference plane is always dependent on its base plane. The small coordinate system of the plane to which the reference plane refers is decisive for understanding the values to be selected.

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 level can optionally be made dependent on a condition.