Surface Merge Min/Max

The Surface Merge (Min/Max) is intended for XY surface triangulations only. The aim is to keep all splits that are lowest/highest in the Z-Direction. A 'split' is one of the triangulation parts which are part of a Boolean operation (Vizex Interactive Boolean displays all splits).

The algorithm works with the following rules:

1. It is always assumed that the first passed triangulation is the topography.
2. Only the "outer" splits from the topography are processed.
3. "Inner" splits are only processed for the second triangulation.

This means that the first input wireframe is considered to be the main topography. The outer edge of this topography is always included until it reaches the outer boundary where the first two surfaces intersect.

The result is that the parts of the second triangulation which occur before this intersection are always discarded, as shown in the following example for a Surface Minimum operation:.