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I have a sparse sim in which several pyro events occur at different times & different places. As new elements are sourced into the sim, the overall bounds of the sim increase - sometimes dramatically changing the quality of the sim as the voxel size adjusts - see two back-to-back frames below. is there a way to maintain a consistent voxel size throughout the duration of the sim while using the sparse solver? Thanks, Luke

Hello, I'm trying out the new sparse pyro tools and really like them. However I am stuck at one point: The "pyrotrailsource" that feeds into the volume rasterize attribute node always produces these weird sources. It looks like the source is cut exactly in the middle in a low and high density field. The screenshot above is straight from the Shelf Tool "Aerial explosion". You can try it out yourself in H18.5. Sadly, the issue carries over into my custom explosions. This is how a customized source produces uncontrollable results in the combustion: Source: Result: Note that this issue is not caused by the shelf tool volume rasterize attribute. I created a fresh node: Same problem. I also checked all the particles outputted by the pyrotrailsource, they look fine and consistent. Any ideas would be much appreciated.

Hi I'm try to do a fire ball but when it emits the fire, appear circular shapes in the surface of the emitter. How can I "break" this shapes? Thank you.

Hi, Is there a way to do this using the sparse pyro, or is this not necessary anymore in 18.5? Thanks!

Hello. I'm going to use the sparse pyro that comes with version 18. However, I want to apply the pump vel to the sparse pyro, but it does not apply. (I brought a pump vel to the source volume and used it, but it cannot be applied.) If anyone knows what to do, let me know. Thank you.

Hi gang ! I'm stumbling across a weird issue and I'd sure like to get some insights about this. I'm trying to color a smoke simulation (having seen Steven's volume III course). But I'm getting a weird issue that I can't wrap my head around. Basically my color field gets contaminated and the disease spreads on. here is what I mean: I'm using both types of pyro solvers, sparse and classic. This issue happens on both. Here is a screen of my simple scene: If you guys have any idea why this is happening that would be fantastic Cheers color_smoke.hip

Hey guys! I've recently been doing some pyro work with the sparse solver adding pyro to my RBD sim's recently and I have been hitting this issue where if I make my voxel size too small my sim will freeze at some point during the sim. It always seems to freeze during the "advecting fields" step. Normally I'd chock this up to the machine running out of RAM or even VRAM but checking in on it the RAM never sees more than 50% usage and VRAM never goes up beyond 10-20%. CPU is pinned at 100% on all cores but the sim is not doing anything. I have not seen any error message in any pop ups or in the terminal either. Running Houdini 18.0.460 on Ubuntu 18.04. Anyone out there who has experienced anything like that? Thanks for the read!

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!