mois23 Posted March 17, 2020 Share Posted March 17, 2020 Hello guys, Just a quick question. I'm studying new Sparse system for Pyro Solver in H18. First change I could see is that Pyro Solver sparse has 4 inputs rather than 5 and “Velocity Update” input is missing. Let's say I want to use a Gas Disturbance micro solver for sparse smoke. How I can connect it to the solver? “Shape” tab in the solver already has a Disturbance option. But, of course, the result is different if I use only the Micro Solver connected to the last input (Forces). So I guess, this approach is wrong. How I can achieve same result using only Micro Solvers? And, first of all.. Does new Sparse Solver allow to use micro solvers? Many thanks! Quote Link to comment Share on other sites More sharing options...
Alahab Posted March 18, 2020 Share Posted March 18, 2020 Yes, Sparse solver allows the use of micro solvers. You should connect them into "Forces" input, so your approach is right. If you want to achieve similar results between "Disturbance" in Shape tab and "Gas Disturbance" micro solver, make sure you compare the settings in "Disturbance" tab under the "Shape" tab and your microsolver's settings. Quote Link to comment Share on other sites More sharing options...
anim Posted March 19, 2020 Share Posted March 19, 2020 On 3/17/2020 at 12:31 PM, mois23 said: I'm studying new Sparse system for Pyro Solver in H18 in that case just dive inside of Pyro Solver (Sparse) DOP, you'll discover that it's just an HDA containing Smoke Solver (Sparse) and bunch of Microsolvers plugged to it, Disturbance is one of the microsolvers and you'll see it plugged into Forces of Smoke Solver, and also pyro's Forces input merged with it, so one look inside immediately answers all your questions result can be different however even with the same settings, as you can see there is Shredding and Turbulence in the way, so using Disturbance in Shaping tab applies it before those 2, using the same Disturbance in Forces input will apply in after those 2, and since all of them modify vel field and disturbance depends on speed of incoming vel, results may differ depending on the order 1 Quote Link to comment Share on other sites More sharing options...
mois23 Posted March 19, 2020 Author Share Posted March 19, 2020 Cool! Thank you so much guys! Quote Link to comment Share on other sites More sharing options...
doc Posted March 24, 2020 Share Posted March 24, 2020 Something else to keep in mind. Shredding in the sparse solver is completely different from what it was in the legacy solver. Shredding in the sparse is using the gas disturb dop to rotate the velocity vectors inside the "flame" field (the "heat" field has been renamed to "flame"). Quote Link to comment Share on other sites More sharing options...
Jesper Rahlff Posted March 24, 2020 Share Posted March 24, 2020 Also the documentation is quite well updated with the difference between the new sparse solver and the old dense solver. https://www.sidefx.com/docs/houdini/pyro/index.html Quote Link to comment Share on other sites More sharing options...
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