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rohandalvi

stopping particles

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hi,

I had once created a galaxy using PFLOW.

The client requirements were specific.

He wanted to show the galaxy being generated from a centre and then after it had grown to a certain size and age the particles would come to a stop and then just spin about a centre.

I am trying to do the same thing in HOUDINI but I cant seem to figure out how to make the particles stop or lose velocity after a certain age and slow down or come to a complete stop.

Any ideas on how to do this.

with regards

Rohan Dalvi

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Hey Rohan

attached is a simple file that shows how to achieve the effect u want

in short, I made a group that groups particles after a certain age, and then i used the velocity POP to scale down that groups velocity.

Theres also a state POP that stops the particles.

it just depends which effect u prefer.

hope this helps

slowDown.hip

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Hey Aracid! thank you very much for share it file, he is very useful. :lol:

Please, I have a question, in the node velocity, you use the variable $VX*0,95 $VYetc... I do not finish understanding as the effect of deceleration of the speed works, because if you are using the variable $VX (etc) and you multiply it by a number. if these multiplying the speed by a number, it wouldn't have to accelerate this one?

Thank you very much.

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Well, I see now, the node group turn on the node velocity when the age of particle lifes it's greater than 0,5, and the node velocity is not a node aceleration, this had confused to me, but I think now it's ok. I see the help of velocity, and these it's a constant rate of movement. Sorry for the confusion.

Thanks

Edited by Ta

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thanks a lot aracid.

I knew I would have to make a group but just didnt know what to use after it.

I think someone should make some particle tuts for Houdini. There are very few at the moment.

But, anyways, thanks again this should really help

with regards

Rohan Dalvi

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