SubD extrude face FAILS with reflection plane

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 this situation, I would think.

SubD reflect, extrude bug.3dm (224.4 KB)

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Same here. Only with gumball extrude. Regular SubD extrude works.

7.0.20154.16016, 2020-06-02

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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.


can you post that model please?

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

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

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

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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.

Next, if I select this vertex and slightly move it so the edge no longer rides parallel on the reflection plane, its fixed.

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

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RH-59020 is fixed in the latest WIP

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

I reopened the bug report with this example.

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https://mcneel.myjetbrains.com/youtrack/issue/RH-60197

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