Calculation of used sites for node "Voronoi on Mesh".

[satabol]

#4979

Inspired by https://www.youtube.com/watch?v=Ip6JI6Qiiwg but more precise.

Some issue is in this video-tutorial - all emitted points has to be applied to source mesh. If no then result will have glitches.
Not all source sites converts to Voronoi cells. This Pull Request take capability to get only used sites:

Voronoi Tower.001.blend.zip

Is it sense to add Mask or Indices of used sites?

P.S.
Finally output socket "Sites" was changes to "Sites_idx"

[portnov]

1. I'd say it is more usual for Sverchok nodes to output masks, rather than subsets of vertices.
2. What if node already exists in the scene, but does not yet have this new output? maybe this is not a problem since the new version of the node was introduced very recently.

[satabol]

1. I'll do indices
2. Code to check new output socket exists in the "process" function. But I think a new version is better. )

[satabol]

@portnov this is new version of file for tests: Voronoi Tower.003.blend.zip (press play for animation)

[portnov]

Sites_idx should be a SvStringSocket then?

[satabol]

What do you think about property to switch type socket to a vector or an index for Site_idx? With rename socket to “Site” and show this additional property in “N-panel”.
Update. Now I thing it is bad idea to switch type of socket on the fly.

[satabol]

Fix socket type to SvStringsSocket:

For tests:
Voronoi Tower.004.blend.zip

[portnov]

ok with me.