Reflect SubD issue

[t.shinya (Shinya)]

Reflect SubD command automatically merges multiple edges if I move a point.

If I move this point to x -0.1, multiple edges merge.

Results

If I disable history update, symmetry fails although it appears that the symmetry is still active.

Is this a normal behavior?

sy.3dm (39.6 KB)

[pascal (Pascal Golay)]

Hello - I see this, thanks.
What happens is that the control point which lies on the symmetry plane is moved across the plane - even though the vertex does not. You can see this if you Tab into box mode.

Also: RH-62474 SubD: Symmetry and History

-Pascal

[t.shinya (Shinya)]

@pascal

What happens is that the control point which lies on the symmetry plane is moved across the plane - even though the vertex does not. You can see this if you Tab into box mode.

Ah, that makes sense. Thank you!
I was surprised to see that moving a single point created 2 extra faces.
Everything tries to merge together if you cross the symmetry borderline.
I guess this is not Symmetry but Reflect after all.

[t.shinya (Shinya)]

SubD Symmetry?

Hi Brian If the points of mother side are moved to the left outside the axis , then the topology breaks Reflect. [Reflect] The same actions but in the T-Splines. First, both sides are interdependent. Secondly, the topology does not break (The axis of symmetry is partially frozen) Third, another positive is that the geometry on the opposite side is changing in real time. TS Symmetry [TS Symmetry]

It looks like this was already discussed here.