Unable to Compute Volume - Possibly Illegal Bounding Polygon

[nloder]

I have a volume surface created from proposed and existing surfaces, and a pretty complex polygon to calculate the volume within an alternative area.

When I select Volumes-Bounded Volumes and select my volume surface, it says "Unable to Compute Volume - Possibly illegal bounding polygon."  It works with other polygons, not this one.  I have tried the following:

FLATTEN the polygon to 2D (all z's = 0)

Re-draw the polygon with one single PE command

Explode and re-join the polygon with PE-Multiple-JOIN

What else can I try?  How else can I get the volume under this specific area?

[Sinc]

You might have duplicate vertices in your polyline.  You can try running the MapClean command, and set it to remove psuedo-nodes, and see if it helps.

[ralstogj]

Try

the Boundary command or the old -hatch command and retain the boundary.

Regards

Justin Ralston

[dgordon · Accepted solution]

sometimes you have to simply move vertices around ever so slighty to get it to work.

Dan

[nloder]

I ended up re-drawing the polygon in three smaller regions, and I was able to compute volume and just add everything together.  Hopefully it keeps working, because I have to frequently update quantities for this area.

Thanks for the responses! 🙂