rohandalvi Posted January 7, 2009 Share Posted January 7, 2009 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 Quote Link to comment Share on other sites More sharing options...
aracid Posted January 7, 2009 Share Posted January 7, 2009 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 Quote Link to comment Share on other sites More sharing options...
Ta Posted January 7, 2009 Share Posted January 7, 2009 Hey Aracid! thank you very much for share it file, he is very useful. 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. Quote Link to comment Share on other sites More sharing options...
Ta Posted January 7, 2009 Share Posted January 7, 2009 (edited) 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 January 7, 2009 by Ta Quote Link to comment Share on other sites More sharing options...
rohandalvi Posted January 8, 2009 Author Share Posted January 8, 2009 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 Quote Link to comment Share on other sites More sharing options...
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