finding the position of particles bounding box

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  08 August 2009
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.
  08 August 2009
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 August 2009 at 12:38 AM.
  08 August 2009
that's brilliant and works like a dream

thanks Ilan
  08 August 2009
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