Why Some Curves Create PlanarSrf and Some Do Not?

Rhino
1

Hey there,

I have a problem (picture attached). I use PlanarSrf command to create planar surfaces but with this particular case for some reason with situation captioned as 2 PlanarSrf detects inner boundaries and with sutuation 1 it does not. What could be the problem? I checked and pretty sure every curve is planar and closed.

Screenshot 2025-08-11 211034
Screenshot 2025-08-11 2110341324×1137 76.2 KB

UPD: I discovered that the issue might be that with the situation 1 the outer boundary is curve and the inner is polyline. Apparently you can’t create PlanarSrf that way. Is there workaround for this problem?

Thank you in advance.

2

The curve at 1 is either not planar, not closed or both. Can you send the file?

4

maybe selfintersecting, just post the geometry no more guesses needed?

5

Sorry, forgot to attache the file. And I also discovered that PlanarSrf command will work if I exclude some inner boundaries out of selection (shown on pictures).

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image1812×958 74.7 KB

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image1970×850 69 KB

Thank you in advance.

PlanarSrf Issue.3dm (126.8 KB)

6

thanks for the file. At tolerance 0.1 the result is as expected.

RH-88817 PlanarSrf from curves fails

7

It really does work that way. Thank you so much.