Geometry problem in 3D donut polygons

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03-26-2023 08:38 PM
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MatthiasBoucher
New Contributor II

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.

MatthiasBoucher_0-1679886112114.png

But the problem is visible in a scene : 

MatthiasBoucher_2-1679886410473.png

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

MatthiasBoucher_1-1679886347671.png

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 :

MatthiasBoucher_3-1679888209995.png

 

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

 

 

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