jesschaco Posted July 20, 2012 Share Posted July 20, 2012 Hi all! I just started digging into Houdini pyro. As a practice, I want to duplicate this fire spreading shot in the video (starting at 00:19). From the look of it, I see three different rings of fire expanding from the same ignition point(the outer blue fire, second less intense ring of fire, and the last ring of fire burning more intensely)So I have been using different particle emitters for each ring. What I am having trouble is the second ring of fire where the fire streaks lick and moves along the surface of the floor. Any idea how this could be done? Or maybe my logic is totally wrong here? Any help would be much appreciated!!! Thank you! Quote Link to comment Share on other sites More sharing options...
Annon Posted July 21, 2012 Share Posted July 21, 2012 Well I would start with a sop solver to get attributes spreading over your ground plane. A leading edge to use for colouring blue later and a radial ramp controlling fuel or something like that. You could tweak the normals from the sop solver to point out from a center point, making the flames apear to be pushing away from center, maybe putting that into a velocity field with the SOP Vector Field: http://www.sidefx.com/docs/houdini12.0/nodes/dop/sopvectorfield Messing with different attributes propagating into the pyro solver from the original sop solver should give you quite a bit of control on how it looks. Hope that helps. C Quote Link to comment Share on other sites More sharing options...
jesschaco Posted July 21, 2012 Author Share Posted July 21, 2012 Thanks Christian! I will give it a try! Well I would start with a sop solver to get attributes spreading over your ground plane. A leading edge to use for colouring blue later and a radial ramp controlling fuel or something like that. You could tweak the normals from the sop solver to point out from a center point, making the flames apear to be pushing away from center, maybe putting that into a velocity field with the SOP Vector Field: http://www.sidefx.com/docs/houdini12.0/nodes/dop/sopvectorfield Messing with different attributes propagating into the pyro solver from the original sop solver should give you quite a bit of control on how it looks. Hope that helps. C Quote Link to comment Share on other sites More sharing options...
bunker Posted July 22, 2012 Share Posted July 22, 2012 You don't need any particles or sopsolvers Think "real word": put some gasoline on the ground and add the temperature from a matchstick, and watch it burn : flamefront.hipnc Hi all! I just started digging into Houdini pyro. As a practice, I want to duplicate this fire spreading shot in the video (starting at 00:19). From the look of it, I see three different rings of fire expanding from the same ignition point(the outer blue fire, second less intense ring of fire, and the last ring of fire burning more intensely)So I have been using different particle emitters for each ring. What I am having trouble is the second ring of fire where the fire streaks lick and moves along the surface of the floor. Any idea how this could be done? Or maybe my logic is totally wrong here? Any help would be much appreciated!!! Thank you! 3 Quote Link to comment Share on other sites More sharing options...
jesschaco Posted July 22, 2012 Author Share Posted July 22, 2012 Thanks Julien, this is awesome! You don't need any particles or sopsolvers Think "real word": put some gasoline on the ground and add the temperature from a matchstick, and watch it burn : flamefront.hipnc Quote Link to comment Share on other sites More sharing options...
jesschaco Posted July 24, 2012 Author Share Posted July 24, 2012 (edited) couldn't figure out why i made an exact duplicate of the settings and couldn't produce the same result. I had to change the field in resizing container to make it work.(weird)~but got it resolved! Please disregard this file. Thanks again Julien! fire.hip Edited July 25, 2012 by jesschaco Quote Link to comment Share on other sites More sharing options...
mms Posted January 10, 2013 Share Posted January 10, 2013 (edited) And how to render You don't need any particles or sopsolvers Think "real word": put some gasoline on the ground and add the temperature from a matchstick, and watch it burn : flamefront.hipnc and how to render it?Result is just black screen. I tried to add import DOP node and import fields node, the I applied a shader, but nothing. I modified your scene, I hope you don`t mind. I`m writing my bachelor thesis about fire and smoke sim in Houdini, so it would be really good to know how to work with own fields and render it. Edited January 10, 2013 by mms Quote Link to comment Share on other sites More sharing options...
xmetallicx Posted January 11, 2013 Share Posted January 11, 2013 (edited) Hey i looked at your file, I deactivated density and fuel in your DOP I/O node and your volume will render. Since it seems that won't really need it for render anyway. Tweaked the shader a little just to get the color. - Joel flamefront_332_joel.hipnc Edited January 11, 2013 by xmetallicx 1 Quote Link to comment Share on other sites More sharing options...
mms Posted January 11, 2013 Share Posted January 11, 2013 Thank you very much! Now I`ll try to understand why it should be like that. Quote Link to comment Share on other sites More sharing options...
Skybar Posted April 10, 2013 Share Posted April 10, 2013 I'm having some trouble with this. It all works fine really, I even managed to create the fuel from a texture. However, the fuel won't "exist" outside of the resizing bounding box. On the first frame it resizes around the heat, which is in the middle. The fuel then gets cropped to that first resize, so when the bounding box grows larger the fuel isn't there. I sort of solved it by continously emitting more fuel, but that kinda destroys the effect. I may add that it does work if I make the bounding box large enough and turn off resizing, but that is quite inefficient. Also, the hip-file from here works just as it should - but I created it myself using 12.5 and yeah, trouble. Anyone have any ideas? Quote Link to comment Share on other sites More sharing options...
cubiccube Posted April 10, 2013 Share Posted April 10, 2013 Inside the gasresize DOP, remove fuel from the "gasresize_fire" field list Quote Link to comment Share on other sites More sharing options...
Skybar Posted April 11, 2013 Share Posted April 11, 2013 Inside the gasresize DOP, remove fuel from the "gasresize_fire" field list Oh wow, I would never have figured that out. Thank you! Quote Link to comment Share on other sites More sharing options...
outtacontex Posted May 18, 2013 Share Posted May 18, 2013 Nice! Quote Link to comment Share on other sites More sharing options...
outtacontex Posted May 18, 2013 Share Posted May 18, 2013 Same thing happened to me Skybar, similar issue anyways. I removed fuel from the gasresize_fire field list and I get a solid cubed bounding box instead of the heat/burn visualization. When the resize container is disabled everything works as it should. Not sure what the issue is. Quote Link to comment Share on other sites More sharing options...
Alexpdennis Posted January 28, 2015 Share Posted January 28, 2015 thank you guys for this Quote Link to comment Share on other sites More sharing options...
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