finding the position of particles bounding box

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Old 08 August 2009   #1
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 August 2009   #2
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.

~Ilan


EDIT:
Actually I just remembered another way to get the center:

getAttr particle1.center;


Then follow the other steps described above.
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Last edited by Wick3dParticle : 08 August 2009 at 12:38 AM.
 
Old 08 August 2009   #3
that's brilliant and works like a dream

thanks Ilan
 
Old 08 August 2009   #4
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