3dbeing Posted September 6, 2011 Share Posted September 6, 2011 I'm trying to get particles to work similar to Maya's nparticles (don't ask). Nparticles organize in a grid like sturcture with collisions. I have tried rbds, but it is prohibitively slow, and I need it to have a fluid like movementto it, while still keeping the grid like structure. I've tried pop-solver in dops, interact pops, pop-vops, so far no joy. I suppose i could use pc-itterate in a vop, but I think that would be extremely slow on high particle counts, and getting them to orginzie in the grid sounds rather complicated. It takes the nparticles litterally 5 mins to create this effect. Anyone have any ideas how to achive this in Houdini? My final option will be to do it in maya and export the particles to Houdini, much to the pleasure of the Maya guys... cheers, -=3db Quote Link to comment Share on other sites More sharing options...
Owl Posted September 6, 2011 Share Posted September 6, 2011 can you provide any kind of reference to that effect? Quote Link to comment Share on other sites More sharing options...
Annon Posted September 6, 2011 Share Posted September 6, 2011 Shouldn't FLIP particles work how you are describing? Quote Link to comment Share on other sites More sharing options...
3dbeing Posted September 7, 2011 Author Share Posted September 7, 2011 This is as close as I can find, obviously this looks more like cloth than particles, but that's kind of the point, i need something in the middle... Thanks chrisitan, i will look at the flip solver... Quote Link to comment Share on other sites More sharing options...
dobin Posted September 7, 2011 Share Posted September 7, 2011 (edited) hmm...I'm not sure what's the point here but could you animate/deform a grid and remove polygons but keep the points afterward? Edited September 7, 2011 by dobin Quote Link to comment Share on other sites More sharing options...
3dbeing Posted September 7, 2011 Author Share Posted September 7, 2011 trying the grid way could be an option, but it would be alot of work to achieve something that comes for free with nparticles. I tried flip fluids, and it does have some settings for keeping the particles apart, but i couldn't quite get it to orginize the way nparticles seem to out of the box. Finally just used cortex to get the points from Maya to Houdini for further processing. Sorry I have to be vague. Thanks for the ideas though! Greatly apprieciated... -=3db Quote Link to comment Share on other sites More sharing options...
Erik_JE Posted September 7, 2011 Share Posted September 7, 2011 Isnt air field just a velocity field? So if you put various velocities in the lets say Y direction but 0 in X and Z you would get a similiar effect? Quote Link to comment Share on other sites More sharing options...
Erik_JE Posted September 7, 2011 Share Posted September 7, 2011 Made a quick example where I create a volume and then advect the particles with it. particles.hipnc Quote Link to comment Share on other sites More sharing options...
Owl Posted September 7, 2011 Share Posted September 7, 2011 was that this you were looking for? temp_wire_sim.mov Quote Link to comment Share on other sites More sharing options...
3dbeing Posted September 7, 2011 Author Share Posted September 7, 2011 Made a quick example where I create a volume and then advect the particles with it. was that this you were looking for? temp_wire_sim.mov You are both right, but the effect I needed to work over a sphere with negative space like liquid, while keeping the grid like structure. I am fairly sure with another week of dev I could have got close with flip, but deadlines and all and nparticles work fairly intuitively out of the box.. I was pinched for time... uggg I hate having to work in maya... Quote Link to comment Share on other sites More sharing options...
Erik_JE Posted September 7, 2011 Share Posted September 7, 2011 When whatever you are working on gets public please post a link. I still have a hard time picturing what it should actually look and work like Quote Link to comment Share on other sites More sharing options...
Alexander Weide Posted September 7, 2011 Share Posted September 7, 2011 ... and nparticles work fairly intuitively out of the box.. I was pinched for time... uggg I hate having to work in maya... i have to say nparticles work out of the box, that could be true, but if you will have this effect in not only one shot it could gonna get comblicated because asset using and particles are not so intuitively out of the box like in houdini;) i hope you will get some time after your task, and try it again in houdini and i believe you will happy start into a new project, with new knowledge and some day you will possibly come to the point where you dont wanna work with maya and autodesk anymore, like i;) hope we will hear from you,soon Quote Link to comment Share on other sites More sharing options...
anim Posted September 7, 2011 Share Posted September 7, 2011 if it works out of the box with nparticles with a single click why don't you just click in maya and make playblast of what exactly are you trying to achieve, maybe then you'll get more exact answer whether it is easy in Houdini or if it needs more complicated setup Quote Link to comment Share on other sites More sharing options...
edward Posted September 8, 2011 Share Posted September 8, 2011 Er, isn't this just cloth? Quote Link to comment Share on other sites More sharing options...
3dbeing Posted September 8, 2011 Author Share Posted September 8, 2011 When whatever you are working on gets public please post a link. I still have a hard time picturing what it should actually look and work like Sure will... i have to say nparticles work out of the box, that could be true, but if you will have this effect in not only one shot it could gonna get comblicated because asset using and particles are not so intuitively out of the box like in houdini;) i hope you will get some time after your task, and try it again in houdini and i believe you will happy start into a new project, with new knowledge and some day you will possibly come to the point where you dont wanna work with maya and autodesk anymore, like i;) hope we will hear from you,soon Hmmm, I've been using Houdini for 6+ years...But obviously I'm in need of some education... Yes Nparticles interparticle collisions pretty much just work, and all I have to do is get them from Maya to Houdini, run out enough frames and do all the real proccessing in houdini. if it works out of the box with nparticles with a single click why don't you just click in maya and make playblast of what exactly are you trying to achieve, maybe then you'll get more exact answer whether it is easy in Houdini or if it needs more complicated setup Unfortunately production frowns on me posting any test scenes/renders/playblasts (total bullies), and I don't have Maya at home. I pretty much just want interparticle collisions that poperly respect pscale. Particle fluids worked except there was too much randomness about their formation that wasn't present in Nparticles. Same with Flip. Er, isn't this just cloth? hmmm, I guess if I could get the cloth to tear and reform like a liquid around a sphere it would be just cloth... I wasn't able to achive that unfortunately... at least not in the alloted time.. Quote Link to comment Share on other sites More sharing options...
3dbeing Posted September 8, 2011 Author Share Posted September 8, 2011 This shouldn't get me in any trouble... here you can see as the particles pile up there is a fair amount of uniformity to their relitive position to eachother. like this only across a surface... Quote Link to comment Share on other sites More sharing options...
petz Posted September 8, 2011 Share Posted September 8, 2011 have you tried to you use springs inside pops or build your own spring-like model with a popsolver-sopsolver-pointcloud cobination? petz Quote Link to comment Share on other sites More sharing options...
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