preserve groups in sops

[TiMc]

Hello guys,

Ive come across a slight problem which I was hoping someone may be able to help with.

I have a sphere animated along a path. I need to use the sphere as a bounding object to group other points.

However, once a point has been grouped, I need it to remain in that group even once it falls outside of the sphere, almost like the preserve group option in pops.

Does anyone know how you would essentially append points to a group in sops and preserve the points that have already been grouped?

Im not too sure if Im being a bit dumb because it seems like it should be a simple thing to do.

Any help would be greatly appreciated.

Thanks a lot.

Tim

[edward]

If you want history in time, the best thing to is to use POPs.

[SpencerL]

If you want history in time, the best thing to is to use POPs.

you basically need a "feedback" loop to lookup what happend on the previous frame, which is what dynamics do (DOPS, and POPS). You could create a sop solver in DOPs.

[TiMc]

Ok guys,

Thanks for your input. I didnt know if there was a way to do this directly in sops but it does seems so.

Thanks again.

[Ole]

Here is one way to do it (CHOPs). It is flexible because you can control the falloff of the bounding object and the falloff of grouping if needed.

Update: Added an object that follows a path, both externally and internally in SOPs.

keepPointsInGroup.hipnc

Edited August 5, 2008 by Ole

[yeshi]

an uncomely solve, use the global variables,

feedback_selection.hipnc

Edited August 7, 2008 by yeshi

[JoshJ]

That is awesome yeshi!

Do you have any more files like this?

(its the first time I've ever seen the script sop used!)

an uncomely solve, use the global variables,