point grouping by distance to other group members

Forums Technical Discussion point grouping by distance to other group members

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sekow: Member; 238 posts; Joined: Nov. 2013; Offline

March 7, 2014 7:11 p.m.

hey,
I like to group points in proximity to points in an other group (cluster centers). cant figure out how to filter in houdini.

Attachments:
pointCluster.hip (70.3 KB)

http://www.sekowfx.com [www.sekowfx.com]


edward: Member; 7750 posts; Joined: July 2005; Offline

March 7, 2014 10:57 p.m.

Perhaps convert your group to an attribute, use AttribTransfer, then convert back to a group.

Attachments:
pointcluster_ViaAttrib.hipnc (75.5 KB)


sekow: Member; 238 posts; Joined: Nov. 2013; Offline

March 8, 2014 5:32 a.m.

Thanks Edward. That is plausible.
Ive changed the setup a bit, now the $PT (wrapped into clsCenterID attr) is transferred over. Works good. But I would like to have continuous order (0,1,2..,n) instead of the actual $PT (just to make it convenient).

Aaaand then I would need individual groups according to the clsCenterID.

Sorry I am new to Houdini and having some difficulties in how things work.
I am used to work in Softimage ICE, where I could switch contexts, build up helper arrays and look up attributes inside one graph.

Thanks in advance, help is much appreciated.

-Sebastian

Attachments:
pointcluster_viaattrib_634.hipnc (77.2 KB)

http://www.sekowfx.com [www.sekowfx.com]


sekow: Member; 238 posts; Joined: Nov. 2013; Offline

March 8, 2014 7:49 a.m.

ok, actually this was pretty easy just parameterizing the clsCenterID…
still the question remains how I create serval groups according that attribute.

Attachments:
pointcluster_viaattrib_634.hipnc (70.1 KB)

http://www.sekowfx.com [www.sekowfx.com]


edward: Member; 7750 posts; Joined: July 2005; Offline

March 9, 2014 3:22 a.m.

Try appending a Partition SOP: Entity = Points, Rule = cluster$CLSCENTERID

This creates the appropriately named groups based on the value of $CLSCENTERID. Unfortunately, this also creates a group named cluster0 containing all the other points so you will have to append a Group SOP to delete it.

Is this what you're looking for?


sekow: Member; 238 posts; Joined: Nov. 2013; Offline

March 9, 2014 9:48 a.m.

jip thats is exactly what I was looking for.
thanks a bunch!

.sebastian

http://www.sekowfx.com [www.sekowfx.com]

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