Ripping edges and vertices

[jlampel]

At the moment, I don't believe we have a way to rip edges and vertices in RetopoFlow. Ripping is an important action in retopology since it's the fastest way to add a gap between two loops.

To match Blender, all tools should rip with the V key:

And rip fill with Alt+V:

I added the tag v4 to clarify that it's not a priority for RF 3x.

[vxlcoder]

this is a bit tricky, because bmesh does not have an equivalent set of operators, especially with fill.

the closest i found are face_vert_separate (doc) and maybe loop_separate (doc), although documentation for loop_separate seem to be a copy-paste from face_vert_separate.

[vxlcoder]

also, i'm not entirely sure how blender makes decisions on what to rip.

for example, what should happen if i press V here?

[vxlcoder]

here is a very simple implementation.

[vxlcoder]

it works only on a single selected edge that is adjacent to exactly two faces, and it rips that edge and verts completely away from surround geometry. note: this is different from what blender does, which involves a lot more work.

[jlampel]

That's still great! Most of the time I use it it's in very simple situations like one edge only connected to two faces. Would it be a quick thing to add this shortcut to the other tools as well so it's not just in PolyPen?

[vxlcoder]

done!