ndeboar Posted March 20, 2014 Share Posted March 20, 2014 Hey, Quick background: I've played lots with SOPs in Houdini, but this is my first test with Dop Pops. I'm trying to do something super simple, emit particles from particles as a trail, similar to the fireworks example. See attached. - Why don't the trails follow the particle they are emited from? - The pop replicate has a life expectancy of 1, but the particles don't die after 1 second? - I can't wrap my head around the two inputs to the replicatePop, i've read the docs a few time, and done some tests, but i feel clueless about this. The fire works example uses the second input, why? Docs seem a bit lacking in the new particle system, there isn't even an example scene for the replicate node, so it is a tad confusing! Ta, Nick D www.nickdeboar.com popsTest.hip Quote Link to comment Share on other sites More sharing options...
Owl Posted March 20, 2014 Share Posted March 20, 2014 (edited) Hi, Nick, - Why don't the trails follow the particle they are emited from? because you've told them not to (in replicate>atributes its set to set initial velocity instead of inherit) The pop replicate has a life expectancy of 1, but the particles don't die after 1 second? That seems to be a bug, if attribute inheritance is disabled life of replicated particles defaults to 100 and if set to inherit attributes from source to the life of source particle - I can't wrap my head around the two inputs to the replicatePop, i've read the docs a few time, and done some tests, but i feel clueless about this. The fire works example uses the second input, why? Than one is a mystery to me Also it seems that "inherit velocity" on pop replicate, modifies velocity of the source particle too :/ Edited March 20, 2014 by Owl Quote Link to comment Share on other sites More sharing options...
ndeboar Posted March 20, 2014 Author Share Posted March 20, 2014 Ah, well, it makes me feel better than I'm not the only one slightly confused! Quote Link to comment Share on other sites More sharing options...
pezetko Posted March 21, 2014 Share Posted March 21, 2014 Pop replicate has some bugs.Fo life attribute look here:http://www.sidefx.com/index.php?option=com_forum&Itemid=172&page=viewtopic&p=144345#144345For second input good explanation is in Houdini 13 Masterclass - Particleshttps://vimeo.com/81611332 Quote Link to comment Share on other sites More sharing options...
kev2 Posted March 22, 2014 Share Posted March 22, 2014 The Masterclass is helpful, Pop Replicate is about 2/3 of the way in. I had a similar issue and used a Kill Pop after getting the Replicate wired in correctly. Lait covers that in the class. Quote Link to comment Share on other sites More sharing options...
ndeboar Posted March 23, 2014 Author Share Posted March 23, 2014 Cool, that answered a few questions. I still don't quite understand why my popReplicate particles don't spawn in the right place. I want them to 'draw' the trail the particles travel, but the trails (popReplicate) are offset. I don't see how inheriting velocity should solve this, I don't want them to have any velocity, they should be static. Nicko Quote Link to comment Share on other sites More sharing options...
mestela Posted September 5, 2016 Share Posted September 5, 2016 Only 2 years too late... Had a look at the setup, its cos you've set the pop replicate to birth in 'sphere' mode, meaning new particles will be created on the surface of a sphere around the original particle. To make them follow exactly, change the shape type to 'point'. 1 Quote Link to comment Share on other sites More sharing options...
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