Rip edge-move for curves #45231

New Issue

Campbell Barton · 2015-06-29T05:44:02+02:00

Campbell Barton commented

2015-06-29 05:44:02 +02:00

Currently with meshes you can press Alt+D to add a vertex at one side of the verts edges and drag it (based on the mouse cursor location).

This same behavior could be added to curves.

the basic behavior with single vertices selected is simple
with multiple segments are selected this becomes more involved (see how this works for meshes).

Currently with meshes you can press Alt+D to add a vertex at one side of the verts edges and drag it *(based on the mouse cursor location)*. This same behavior could be added to curves. - the basic behavior with single vertices selected is simple - with multiple segments are selected this becomes more involved (see how this works for meshes).

Campbell Barton commented

2015-06-29 05:44:02 +02:00

Changed status to: 'Open'

Campbell Barton commented

2015-06-29 05:44:02 +02:00

Added subscriber: @ideasman42

Kevin Mackay commented

2015-08-03 23:29:50 +02:00

Added subscriber: @KevinMackay

Kartikey Agrawal commented

2015-12-11 10:22:27 +01:00

Added subscriber: @kartikey0303

Marcelino Coll self-assigned this 2016-03-20 14:46:46 +01:00

Sam Bickley commented

2016-04-06 22:23:34 +02:00

Added subscriber: @samb96

peter lu commented

2016-09-30 17:56:10 +02:00

Added subscriber: @pdlla

peter lu commented

2016-09-30 17:56:10 +02:00

I'd like to give this task a go if MarceColl is no longer working on it.

Abhilash Verma commented

2017-01-24 16:04:25 +01:00

Added subscriber: @rogeredthat

Marcelino Coll was unassigned by Campbell Barton

2017-03-03 15:05:50 +01:00

Campbell Barton commented

2017-03-03 15:05:50 +01:00

Added subscriber: @MarceColl

Rohan Rathi commented

2017-03-19 15:53:35 +01:00

Added subscriber: @RohanRathi

Rohan Rathi self-assigned this 2017-03-19 15:53:35 +01:00

Rohan Rathi commented

2017-03-19 15:53:35 +01:00

I would like to try the task.

Gurcharan Singh commented

2019-07-15 14:53:38 +02:00

Added subscriber: @gs_1001

Adarsh Akshat commented

2020-03-28 21:35:25 +01:00

Added subscriber: @adarshakshat

Scott Wilson commented

2020-05-14 03:09:39 +02:00

Added subscriber: @propersquid

Ketan Jain commented

2020-10-13 08:32:17 +02:00

Added subscriber: @ketanjainn

Mangal Kushwah commented

2023-03-14 07:33:03 +01:00

is anyone working on this?

Patrick Foley commented

2023-06-11 02:25:48 +02:00

I've been looking into this recently. I think the real trick would be in determining which curve segments are closest to the cursor. For poly curves I think this process would be almost identical to how the evaluation for the closest edge to cursor is made, since poly curve segments are functionally edges already.

For bezier and NURBS type curves, I think the control points would have to be projected onto screen-space, and then the minimum distance to the cursor for each connected segment would be evaluated. It seems there are various ways to achieve this through the polynomial properties of the curves, though depending on performance and simplicity of implementation, we may need to settle on one.

After finding the closest segments, it would then become a matter of creating the new curve segments within the original curve, as with how this operation works for mesh editing.

Coding the functionality to find the closest curve segment to the cursor might open up other operations for implementation, as well. You'd be able to select the closest segment by clicking near it (as with mesh edges), or maybe you could also subdivide a segment at a particular point by clicking it.

I've been looking into this recently. I think the real trick would be in determining which curve segments are closest to the cursor. For poly curves I think this process would be almost identical to how the evaluation for the closest edge to cursor is made, since poly curve segments are functionally edges already. For bezier and NURBS type curves, I think the control points would have to be projected onto screen-space, and then the minimum distance to the cursor for each connected segment would be evaluated. [It seems there are various ways to achieve this](https://stackoverflow.com/posts/23865251/revisions) through the polynomial properties of the curves, though depending on performance and simplicity of implementation, we may need to settle on one. After finding the closest segments, it would then become a matter of creating the new curve segments within the original curve, as with how this operation works for mesh editing. Coding the functionality to find the closest curve segment to the cursor might open up other operations for implementation, as well. You'd be able to select the closest segment by clicking near it (as with mesh edges), or maybe you could also subdivide a segment at a particular point by clicking it.

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Rip edge-move for curves #45231