Terrain Triangulation Method Improvement

Idea created by TRRP on Jul 13, 2016
    • TRRP

    This borders on a bug...

    I've been working with terrains that have a portion of nodes in a grid pattern.  The points are two-dimensionally equidistant and ArcGIS (10.2) seems to use a randomization method for deciding which diagonal to triangulate across given a perfect square of points (2 dimensionally).  Each time I build the terrain with the same points, different diagonals are chosen.  I even have some evidence that triangulation was somehow re-randomized within a terrain that was not rebuilt (I just moved the geodatabase between drives).


    This results in an unpredictable surface model.


    But the points are not truly equidistant when considered in 3 dimensions (including z-values).  Shouldn't terrain triangulation consider z-values to find the shortest diagonal?