Supersaqib 1 Posted December 21, 2011 Hi All, I'm quite new to houdini and am trying to get more into DOPs and POPs. Basically i have a ship which i have made up of points using the scatter sop. I have a selection growing on it which after 100 frames covers all the points colouring them red. I have put an add node to add a particle system and would like to apply gravity to it. When i create a dop network connected to the add i'm not sure which node to use to bring those particles into the dop. As the color is updating with time i want the gravity to be applied to the particles once they turn red. Which op can i use to bring the particles into the DOP after which i can add gravity or should i be using a POP in which case which op do i use for that. Thanks Any recommendations for where i can learn about POPs and DOPs would be much appreciated too. Thanks Saqib Share this post Link to post Share on other sites
3dbeing 13 Posted December 22, 2011 (edited) It all depends on you which method you use, there are pros and cons to both choices... The thing you want is for them to only be red on the frame which they are introduced into the sim whether it be dops or pops, then delete everything that is not red and pipe that into your sim. With pops you would use a source node, with dops use sopgeo Edited December 22, 2011 by 3dbeing Share this post Link to post Share on other sites
