[Sidefx-houdini-list] center of mass?

Eetu Martola eetu at iki.fi
Sat Jan 31 05:27:21 EST 2009


 > Tom Nixon wrote:
 >> Is there a quick and dirty way to calculate the center of mass of 
geometry?
 >>
Louis Dunlevy wrote:
> A super duper cheapo way would be to use the attribute promote sop.
> Stick position in the colour and then promote the colour to a detail
> attribute using the avarage method..
> 

The average of point positions is not necessarily very close to center
of mass. think of a large cube connected to a small geosphere, average P
would be a lot closer to the sphere.

Here's a quickly knitted vop sop doing it via a volume;
http://eetu.iki.fi/hou/center_of_gravity.hip

The idea is to take a volume representation of the object, and
take the average of the voxel positions, weighted with voxel opacity.

Of course there are probably 5 more elegant ways to do it, but anyway.. :)

eetu.





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