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"To sphere" operation unexpected behavior with proportional editing on
Open, Confirmed, LowPublic

Description

System Information
Operating system: Win 10
Graphics card: NVIDIA GeForce GTX 970

Blender Version
Broken: 2.79b release, also 2.80 2019-05-26 d525c76003b3 branch: blender2.7

Short description of error
Using "To Sphere" on a mesh that has unselected, unconnected polygons, while proportional editing is enabled in any way causes selected polygons to abnormally increase in size as it becomes spherical, rather than staying at a similar size. The size of the outputted sphere is larger when there are more polygons disconnected from the target.

Exact steps for others to reproduce the error
Use attached file.
Press ALT-SHIFT-S (To Sphere default keybinding) and spherize the spikey shape to 100%.

Details

Type
Bug

Event Timeline

Philipp Oeser (lichtwerk) triaged this task as Confirmed, Low priority.

Can confirm the behavior, same happens in 2.79.
I think this will go for the boundingbox of the entire object in that case, will check...

Will confirm for now, although this might turn out to be now bug in the end...