Help with particle explosion: Geo keeps rotating after colliding with ground

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# 1 21-10-2013 , 04:41 AM

Subscriber
Join Date: Dec 2012

Posts: 12

Help with particle explosion: Geo keeps rotating after colliding with ground

I am very new to scripting and would really appreciate some help.
I have been following some tutorials online and I have been able to create a particle instance explosion, but I have not been able to stop the particles from rotating once they hit the ground. Could someone please help me with this.

Here is the maya file, it's only 400k
https://www.dropbox.com/s/911gg69g0...cleExplosion.ma
Here is a playblast
https://youtu.be/1he_cFjMYiI

Creation Expression
float $scaleNum = rand (.2,1); particleShape1.customOrient =<<rand(360),rand(360),rand(360)>>;
particleShape1.customSpeed = rand(30,-30);
particleShape1.CustomIndex = rand(0,5);
particleShape1.customScale = <<$scaleNum,$scaleNum,$scaleNum>>;

RuntimeExpression
particleShape1.customOrient += particleShape1.customSpeed;

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# 2 05-11-2013 , 02:27 PM

Moderator
Join Date: May 2003

Location: London

Posts: 1,001

Hello,
Particles are extremely basic representations for something like this.
My advice would be to just use rigid bodies for this kind of thing.
The reactions will always be completely un-physical with this kind of thing, the most you can do is to use the particle collision event editor to call a procedure to set your custom speed to 0 which will stop the orientation change in your particles.

https://intranet/apps/Linux64/aw/maya...ber=d28e397251.

The rule of thumb is to use rigid bodies for anything that should be interacting in any meaningful way with the environment and then you can use simple particles with instancing for adding tons of extra geoemtric detail on top.

FX supervisor - double negative

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