[Sidefx-houdini-list] center of mass?

Tom Nixon tnixon at laika.com
Mon Feb 2 12:51:22 EST 2009


Ahh, yeah, I was hoping for a more accurate way than averaging. 

Thank you. great idea.

T

----- Original Message -----
From: "Eetu Martola" <eetu at iki.fi>
To: sidefx-houdini-list at sidefx.com
Sent: Saturday, January 31, 2009 2:27:21 AM GMT -08:00 US/Canada Pacific
Subject: Re: [Sidefx-houdini-list] center of mass?

 > 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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