Geometry problem in 3D donut polygons

MatthiasBoucher — Mon, 27 Mar 2023 03:38:16 GMT

Hello,

I'm facing a problem in ArcGIS Pro when I create a 3D polygon with a hole (donut), either with the geometric tools of the ribbon or with python code. I try to build donuts where the Z values of the inner ring (the hole) are constant, but lower than the Z values of the upper ring (like a cycling track or like a bathtub). Here in a 2D map everything seems fine, as we cannot see the Z.

But the problem is visible in a scene :

Everytime on two sides of the donut, some upper points are linked together with an edge :

Byt the way, this is not a display problem, as it persists after converting the polygon to different outputs (KML, Shapefile, etc).

I tried to reproduce this behaviour click by click with a more simple polygone, but still :

Is there a way to properly order the points so as to obtain a smooth slope without the 2 flat parts ?

topic Geometry problem in 3D donut polygons in ArcGIS Pro Questions

Geometry problem in 3D donut polygons