ryew
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Sorry I don't have time to check your file, but perhaps this tutorial regarding animated vellum constraints from Rohan Dalvi could help if you haven't already seen it
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Vellum Sims On Models With Overlapping Pieces
ryew replied to RyanJP's topic in General Houdini Questions
+1 on both of these points. I have made it a habit to use a convert to poly any time I unpack geometry after experiencing inconsistencies with selection when only unpacking geo. -
Great to hear - best of luck, Marc!
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Useful tricks to know - thanks for sharing your knowledge and work with the community
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Quickest way is just to animate the Activation attribute on your Source Volume node to 0 on the 25th frame or set $FF < 25 in that field
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tree destruction - getting that "bendyness" into it ?
ryew replied to anthonymcgrath's topic in Effects
In case you hadn't already seen it, there was this post recently that mentioned using cone twist constraints for a bending-type effect in splintering wood, perhaps that might help -
Have you considered ramping pscale down with a sop solver for a particular height/region first rather than deleting outright? I don't have time to run a quick test right now, but reducing pscale will break up the fluid surface and possibly give a decent/natural organic result.
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I would suggest getting a basic setup built and then enhancing it from there, rather than trying for a high-complexity solution with no prior groundwork laid out
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I haven't checked your scene, but if you haven't already tried it, check out the POP Awaken DOP; I've used that to successfully wake up sleeping grains particles
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It's difficult to offer suggestions without any real context for scale, motion, settings, etc. but meshing is an issue that's come up on the forums more than once so it's definitely worth searching the forum for related posts that might help. In the meantime, if you have an example setup with lightweight isolated cache frame/sequence you can upload, that would better allow people to offer tweaks and suggestions
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The example file for the POP Curve Force included with Houdini includes a FLIP fluid example; the options on that node can probably get you a lot of the way there
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Before you invest too much time in custom velocities fields, I would definitely second Atom's suggestion of adding some subtle ribs or other cheat geometry detail to your collision object for starters as that will help influence the way velocities evolve in the sim over time. It's also always a good idea to post an example scene demonstrating your current attempts as well if it's not in violation of any confidentiality agreements
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Yes, as bloodhawk says, try the curve pop force, there was already a post in the forum about this exact same effect (just search for the word "warcraft" and you'll see it)
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Perhaps handing off from a DOP cache to an animated or static copy of the geometry you can capture/deform to would help? I know that's often a trick people doing cloth sims I've spoken to use for stubborn sims
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If changing the input geometry is the only modification that makes your setup go from working to not working, it would be good to start by checking what differences exist for your input geometries.
