SubD extrude face using the gumball fails when single vertex resides on the reflection plane. See images below. File attached. I’m running on 7.0.20154.14355. I understand this extrude operation creates a potentially weird vertex condition. Is this to be expected? SubD should be able to handle thi…

Same here. Only with gumball extrude. Regular SubD extrude works. 7.0.20154.16016, 2020-06-02

Interesting. If I extrude by typing the command, the face extrudes, however, I don’t get a reflection and the model becomes uneven. Next,If I modify the model in any way, the previously extruded face breaks…but at least becomes symmetrical again. [image] [image]

can you post that model please?

@theoutside , It’s attached to my initial post.

odd. inset works, as does a ctrl+scale to create an inset face…I’ll write it up!

https://mcneel.myjetbrains.com/youtrack/issue/RH-59020

Another observation: Upon extruding this face again by using the _ExtrudeSubD command and toggling to SubD Flat Display, you can see that this edge rides right along the reflection plane. [image] Next, if I select this vertex and slightly move it so the edge no longer rides parallel on the ref…

yep- I’m seeing the same thing. we’ll dig into it!

Hi, @theoutside . The SubD becomes non-manifold in this situation.

SubD extrude face FAILS with reflection plane

Serengeti (Rhino WIP)

brian (Brian Gillespie) August 26, 2020, 6:18pm 11

RH-59020 is fixed in the latest WIP

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SubD extrude face FAILS with reflection plane

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