Swapniel16 Posted October 12, 2014 Share Posted October 12, 2014 Hello everyone, Since I'm learning Houdini, I was trying my hands on Particle systems. I was following a tutorial and a doubt came to my mind. My question is, I have emitted particles(in positive Y direction and random X and Z direction) with gravity. When the posY is 0, the particles keep sliding in posX and posZ, maintaining the posY=0. I want the speed in posX and poxZ to slow down gradually and stop after some time. Its like after an explosion debris should come to rest after some collisions on ground. Can anyone please tell me How can I achieve this effect? P.S. I have not used collision sop, everything is being done in vopsop and voppop. Quote Link to comment Share on other sites More sharing options...
pezetko Posted October 12, 2014 Share Posted October 12, 2014 Set up some friction on particles (popobject), default one is 0. Also look at "Pop drag DOP". Quote Link to comment Share on other sites More sharing options...
Swapniel16 Posted October 14, 2014 Author Share Posted October 14, 2014 Hi Petr, I'm not using any object for collision, and drag field will apply to all the particles. What I want is, when particles slide, they should stop after a while. Quote Link to comment Share on other sites More sharing options...
pezetko Posted October 14, 2014 Share Posted October 14, 2014 They slide on what? Show as some example file. Quote Link to comment Share on other sites More sharing options...
Swapniel16 Posted October 14, 2014 Author Share Posted October 14, 2014 Here is the file. Please have a look. particles_toStopGradually.hipnc Quote Link to comment Share on other sites More sharing options...
pezetko Posted October 14, 2014 Share Posted October 14, 2014 Ok, you are using old Pops, so there is no default friction. Look at attached file. First solution maps speed of sliding particles (with P.y == 0) to the age. Second one multiply speed each time by some value smaller then 1. So in each step it gets 0.9 times slower then in previous step (the lower the number is the quicker they stop). These two are implemented directly in voppop. Third solution is using drag (and limit it to the sliding group only). particles_toStopGradually1.hipnc Quote Link to comment Share on other sites More sharing options...
Swapniel16 Posted October 15, 2014 Author Share Posted October 15, 2014 Thanks a lot petr. But I didn't get the meaning of "old pops". Does that mean they aren't used in newer versions?? I'm sorry if that sounds silly. Quote Link to comment Share on other sites More sharing options...
pezetko Posted October 15, 2014 Share Posted October 15, 2014 In H13 if you create POP Network node there are two options: "POP Network" (new in this version, using DOP) and "POP Network - old". Quote Link to comment Share on other sites More sharing options...
Swapniel16 Posted October 15, 2014 Author Share Posted October 15, 2014 Ok, Got it. Thank you Petr for the valuable infos. Quote Link to comment Share on other sites More sharing options...
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