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Old 08-14-2009, 11:30 PM   #1
Christopher Phillips
Zoic Studios
Join Date: Dec 2004
Posts: 62
finding the position of particles bounding box

Is it possible to find out the centre position of the bounding box for a particle shape?

I have a swarm of particles moving all over the place using goals and i want to attach a volume axis field that will always sit in the "averaged" centre of the particles.
Old 08-15-2009, 12:22 AM   #2
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Ilan Gabai
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Hey Chrispy,

This may help point you in the right direction.
So it has to be a runtime expression, because your particles are always moving.
Now to get the bounding box data you can run something like this:

float $bBox[] = `exactWorldBoundingBox particleShape1`; vector $bBoxCenter = <<($bBox[0] + $bBox[3])/2, ($bBox[1] + $bBox[4])/2, ($bBox[2] + $bBox[5])/2>>; particleShape1.theCenterX = $bBoxCenter.x; particleShape1.theCenterY = $bBoxCenter.y; particleShape1.theCenterZ = $bBoxCenter.z;

then create an expression on your field like this:

yourField.translateX = particleShape1.theCenterX; yourField.translateY = particleShape1.theCenterY; yourField.translateZ = particleShape1.theCenterZ;

Its fairly easy to set up from here, let us know how it goes.

good luck.


Actually I just remembered another way to get the center:


Then follow the other steps described above.
my amazing tumblr

Last edited by Wick3dParticle : 08-15-2009 at 12:38 AM.
Old 08-15-2009, 01:06 AM   #3
Christopher Phillips
Zoic Studios
Join Date: Dec 2004
Posts: 62
that's brilliant and works like a dream

thanks Ilan
Old 08-15-2009, 01:06 AM   #4
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