Change/Rebuild polygon defining start point/vertex based on Z value

I haven't tried this at all, but what if you:

connected the vertices into a line (polygon perimeter)

used a coordinateExtractor to get the list of vertices , sorted the list so the highest z was first

vertexCreator from the coordinates of the first element in the list

pointOnLineOverlayer to split the the line at that point

rebuilt the resulting two lines into a polygon. (an areaBuilder might pick them up in the correct order anyhow, if not then using a LineCombiner after you switch the order of the lines would work)

Hi @od10​ Here's a workspace showing @jdh​ 's idea. The tricky part is hoping that the 2 lines will be in the right order to make the vertex with the highest Z value the start/end point of the polygon. I found that the TopologyBuilder did this consistently.