If you select the Optimised geometry layer division, the following input window appears:

The following image shows a 3D model with several outcropping layers to illustrate the complexity of such geological conditions.

Outcropping layers in complex geological conditions

Refinement, the top edge of the layer is retained, but not the geological layer assignment. The layer-specific attributes should be saved beforehand for this division variant.

Layer division in SPRING6

Construction of a 3D- partial model