catchyid Posted September 19, 2020 Share Posted September 19, 2020 hi, I am tying to understand vortex filament simulation, found one example in houdini docs but still cannot get it? vortex filament : is it a line where its tangent is the center of rotation? can it be a line or must a closed curve? Thanks Quote Link to comment Share on other sites More sharing options...
nuki Posted September 20, 2020 Share Posted September 20, 2020 (edited) Found this in the hou docs: Filaments are closed polylines (polygonal curves) that represent vortex forces. The general filament setup works like this: Create a a geometry network to create the filament geometry. Import the filament geometry into the simulation network using the Source Filaments node. The Filament Solver node advects the points of the filaments to make them drift through space. While the Filament solver moves the filaments, the POP Advect by Filaments node applies vortex forces to surrounding particles, making them swirl around nearby filaments. source Edited September 20, 2020 by nuki 1 Quote Link to comment Share on other sites More sharing options...
Librarian Posted September 20, 2020 Share Posted September 20, 2020 (edited) On this site you have Olalala la Nice stuff and Codes Files abs Everything.Have Fun . http://dgd.service.tu-berlin.de/wordpress/ddg2018/ Edited September 20, 2020 by Librarian 2 Quote Link to comment Share on other sites More sharing options...
catchyid Posted September 21, 2020 Author Share Posted September 21, 2020 thanks guys, since they are fluid simulator, can they be replaced pyro solver? i.e. what makes them special to have their own solver? I think they are scaled down version of the a fluid simulator that sims only circluar vortexes (so they can sim only this kind of motion but fast)? it's like a ripple solver vs flip solver? thanks again Quote Link to comment Share on other sites More sharing options...
anim Posted September 21, 2020 Share Posted September 21, 2020 4 hours ago, catchyid said: thanks guys, since they are fluid simulator, can they be replaced pyro solver? i.e. what makes them special to have their own solver? I think they are scaled down version of the a fluid simulator that sims only circluar vortexes (so they can sim only this kind of motion but fast)? it's like a ripple solver vs flip solver? thanks again I believe this distinction is pretty well described here https://www.sidefx.com/docs/houdini/dopparticles/filaments.html also it's possibly based on a paper like this, where you can learn more about the target use cases and comparison to other approaches http://page.math.tu-berlin.de/~pinkall/forDownload/filaments.pdf https://dl.acm.org/doi/abs/10.1145/1778765.1778852 1 Quote Link to comment Share on other sites More sharing options...
catchyid Posted September 21, 2020 Author Share Posted September 21, 2020 Thanks everyone, I guess a lot of things to read about now Quote Link to comment Share on other sites More sharing options...
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