scale to 0 make vertex un-movable in edit mode #33497

New Issue

Krantz Geoffroy · 2012-12-12T17:24:03+01:00

Krantz Geoffroy commented

2012-12-12 17:24:03 +01:00

%%%So to reproduce it's easy.
Default scene,
go in the right panel and set Z (for eg)scale value to 0,
go in edit mode and try to move a vertex.
The same problem appear when you set dimension Z(for eg) value to 0

I've seen when in 3D view you make s+Z+0 then it set the value to 0.000001 or something really low.
Maybe you should check if the user enter the 0 value in the panel and set to 0.000001 too.

ubuntu 12.04 64bits, last svn, I don't know since when.
%%%

%%%So to reproduce it's easy. Default scene, go in the right panel and set Z (for eg)scale value to 0, go in edit mode and try to move a vertex. The same problem appear when you set dimension Z(for eg) value to 0 I've seen when in 3D view you make s+Z+0 then it set the value to 0.000001 or something really low. Maybe you should check if the user enter the 0 value in the panel and set to 0.000001 too. ubuntu 12.04 64bits, last svn, I don't know since when. %%%

Krantz Geoffroy commented

2012-12-12 17:24:03 +01:00

Changed status to: 'Open'

Brecht Van Lommel commented

2012-12-12 19:54:36 +01:00

%%%Scaling to zero should be allowed, it's useful sometimes.

The problem here is the matrix inverse function, it fails and doesn't return a useful result. Not sure what would be the best way to solve that, we could try to make it handle this case better. Maybe adding an epsilon to the diagonal, inverting the 2x2 matrix subset, using a pseudoinverse, would need some testing to find out what works best.%%%

%%%Scaling to zero should be allowed, it's useful sometimes. The problem here is the matrix inverse function, it fails and doesn't return a useful result. Not sure what would be the best way to solve that, we could try to make it handle this case better. Maybe adding an epsilon to the diagonal, inverting the 2x2 matrix subset, using a pseudoinverse, would need some testing to find out what works best.%%%

Tobias Oelgarte commented

2012-12-13 14:31:21 +01:00

%%%If an object is scaled to zero along one axis in object-mode it is practically impossible to move that vertex in edit-mode along this axis. Any movement away from zero would result in infinity in edit-mode (Grab G / Division by zero). But it should be possible to set the location by hand, bypassing this calculation.%%%

Brecht Van Lommel commented

2012-12-14 22:41:20 +01:00

%%%Fix in svn now, using a pseudoinverse. The way it works is still a bit strange as it no movement along the axis is not possible, but at least it's possible to move vertices.%%%

Brecht Van Lommel commented

2012-12-14 22:41:20 +01:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2012-12-14 22:41:20 +01:00

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scale to 0 make vertex un-movable in edit mode #33497