Hazoc Posted March 8, 2011 Share Posted March 8, 2011 (edited) http://www.realflow.com/rf_casestudies.php?cs=casestudies/cs_36deathpenalty.php Should be doable in Houdini. If someone has a neat little hip where particle fluid attributes like viscosity, drag etc. are varied on a particle basis in a sop solver, please feel free and welcome to post it here:) Edit: Nice file from Bunker may give direction. Edited March 8, 2011 by Hazoc Quote Link to comment Share on other sites More sharing options...
lukeiamyourfather Posted March 8, 2011 Share Posted March 8, 2011 (edited) They might have done work on the solver in house, or the might have used this (or both). http://resources.realflow.com/news_scripts.php?t=2#page=1&mode=0&id=145 The plug-in allows for temperature dependent behaviour in fluids. It applies a non-newtonian approach to a custom viscosity that can co-exist or replace the native viscosity of the fluid. When temperatures are above the boiling temperature, then fluid will be force upwards and then it will cool down again. The temperature of the fluid is influenced by the temperature of objects and an ambient temperature defined in the parameters of the plug-in. Is it doable in Houdini? Probably, though I'd imagine it to be pretty difficult. As far as I know the fluid solvers in Houdini don't handle non-Newtonian fluids out of the box. Either way I'd love to know how too! Edited March 8, 2011 by lukeiamyourfather Quote Link to comment Share on other sites More sharing options...
Hazoc Posted March 8, 2011 Author Share Posted March 8, 2011 (edited) Is it doable in Houdini? Probably, though I'd imagine it to be pretty difficult. As far as I know the fluid solvers in Houdini don't handle non-Newtonian fluids out of the box. Either way I'd love to know how too! Not "out of the box", but if you can modify particle fluid simulation to change it's properties localy like starting from rigid, cold form and then becoming soft and finally dripping, similar melting effects could be created I think. The fluid already has these attributes. They just need to be controlled right. Edited March 8, 2011 by Hazoc Quote Link to comment Share on other sites More sharing options...
Macha Posted March 8, 2011 Share Posted March 8, 2011 Astonishing! I'm not saying I solved the problem, but I prototyped something along those lines here: I think a cleverer man or woman than me could do something like that and use it as a particle system for a flipsolver. Quote Link to comment Share on other sites More sharing options...
hopbin9 Posted March 9, 2011 Share Posted March 9, 2011 If anyone could do wax melting. You can macha Quote Link to comment Share on other sites More sharing options...
Macha Posted March 9, 2011 Share Posted March 9, 2011 (edited) If anyone could do wax melting. You can macha Oh I wish. I make a lot of noise but watch out for the quiet ones. Anybody who's been on this board continuously for more than 4 years and has less than 10 posts is likely to be a super-H-master doing melting solvers before breakfast. Edited March 9, 2011 by Macha 1 Quote Link to comment Share on other sites More sharing options...
Marc Posted March 9, 2011 Share Posted March 9, 2011 So what does that make me I wonder? Dang, I knew I shouldn't have posted so much. M Quote Link to comment Share on other sites More sharing options...
Hazoc Posted March 9, 2011 Author Share Posted March 9, 2011 I'm not saying I solved the problem, but I prototyped something along those lines here: That could be pretty close already! Have you tried how it behaves with more complex geometry ? Quote Link to comment Share on other sites More sharing options...
jason_slab Posted March 9, 2011 Share Posted March 9, 2011 pretty cool, i saw it a few weeks back while looking at this forum/thread http://www.cgfeedback.com/cgfeedback/showthread.php?t=44&page=9 would like to see some breakdowns j Quote Link to comment Share on other sites More sharing options...
Hazoc Posted March 9, 2011 Author Share Posted March 9, 2011 (edited) would like to see some breakdowns Here's a prototype of the wax. Doesn't seem to be be anything beyond Houdini's abilities or is it just me ? Maybe its using some Heat per area -method to determine how much liquid wax particles has to be emited. Those particles slide down iso surface of the main wax volume that is getting softened and shrinked. Here's a quick test to use SDF and some arbitrary heat field to point out areas with high melting potential of the legendary stanford buddha: And I haven't had my breakfast yet. Edited March 9, 2011 by Hazoc Quote Link to comment Share on other sites More sharing options...
Macha Posted March 9, 2011 Share Posted March 9, 2011 (edited) Anybody who's been on this board continuously for more than 4 years and has less than 10 posts is likely to be a super-H-master doing melting solvers before breakfast. Looks like Hazoc just outed him/herself as one of those low-key super-H-masters! Most Excellent! Edited March 9, 2011 by Macha Quote Link to comment Share on other sites More sharing options...
bunker Posted March 9, 2011 Share Posted March 9, 2011 Hey Hazoc I just tried a quick hack : updating the velocity before the gas_integrator stage. there is a switch with 2 different melting options in the file melt_01.hip have fun melting stuff http://www.realflow.com/rf_casestudies.php?cs=casestudies/cs_36deathpenalty.php Should be doable in Houdini. If someone has a neat little hip where particle fluid attributes like viscosity, drag etc. are varied on a particle basis in a sop solver, please feel free and welcome to post it here:) Edit: Nice file from Bunker may give direction. Quote Link to comment Share on other sites More sharing options...
bunker Posted March 9, 2011 Share Posted March 9, 2011 Hey Hazoc I had a quick 10 mins go at it : I simply update the velocity before the gas_integrator stage... there is a switch with 2 different melting options in the file melt_01.hip have fun melting stuff http://www.realflow.com/rf_casestudies.php?cs=casestudies/cs_36deathpenalty.php Should be doable in Houdini. If someone has a neat little hip where particle fluid attributes like viscosity, drag etc. are varied on a particle basis in a sop solver, please feel free and welcome to post it here:) Edit: Nice file from Bunker may give direction. Quote Link to comment Share on other sites More sharing options...
Hazoc Posted March 9, 2011 Author Share Posted March 9, 2011 Hey Hazoc I had a quick 10 mins go at it : I simply update the velocity before the gas_integrator stage... there is a switch with 2 different melting options in the file melt_01.hip have fun melting stuff Well there we go! I'll try to integrate my dynamic Thickness to heat exposure -tracking system extravaganza to this soon. Quote Link to comment Share on other sites More sharing options...
bunker Posted March 9, 2011 Share Posted March 9, 2011 Have a look at this file, it's a bit better melt_02.zip Well there we go! I'll try to integrate my dynamic Thickness to heat exposure -tracking system extravaganza to this soon. Quote Link to comment Share on other sites More sharing options...
pclaes Posted March 9, 2011 Share Posted March 9, 2011 nice modification Julien! If you want viscosity too it is just a blur of the velocity (just pcfilter -- or attribtransfer, haven't tested the attribtransfer in 11, it's supposed to be lots faster)... and link the viscosity (blur) to the heat. It's cold -> high viscosity, it's hot low viscosity. That way you can have wax that heats up and cools down and solidifies again . See if you can droop some wax on top of each other. It's that cool effect where by one more liquid hotter or lighter fluid overtakes another. Kinda like that extra droopy detail you saw in that realflow ice cube. I wanna give it a go too, this is fun . Quote Link to comment Share on other sites More sharing options...
morean Posted March 10, 2011 Share Posted March 10, 2011 that's cool share about wax melting Quote Link to comment Share on other sites More sharing options...
loudsubs Posted March 12, 2011 Share Posted March 12, 2011 Hi guys, I've been playing with bunker's file. I'm trying to advect the teapot geometry (converted to polys) using the advect pop. When I try this, the teapot sop geometry seems to move much faster than the flip sim from dops. And the entire geometry gets advected instead of just the white areas. What I'm expecting to happen, is to have just the points (on the sops geometry) that are close to the "intitial melt points" (white areas of sim) get advected. Instead, all the points of the sops geometry are getting advected straight from the beginning. Is there something I'm missing when I try to advect the sops geo to get this delayed melting effect? It seems (to me) that some of the particles (from the advect pop) should not start moving until a few frames in since the velocity is 0 until they turn white in the sop solver. I thought maybe the velocity field being called into the advect pop is one that is before the sop solver affects it, but not really sure. Any ideas on how to advect just parts of the geometry as in the sop solver sim? Thanks Quote Link to comment Share on other sites More sharing options...
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