A calculation surface is an area in which the illuminance can be “measured” without affecting the light distribution themselves. Various calculation surface norms exist, for instance the work plane, the correct reading level for hospitals etc.
A calculation surface is displayed as a transparent surface, as the example shows. The surface which appears transparent is the surface which provides the calculation results. The surface is invisible when viewed from the other side. No results are calculated for the invisible side.
These objects can be scaled and rotated like all other furniture. Exception: windows and doors are always plane-parallel to the respective wall.
