anthonymcgrath Posted September 28, 2016 Share Posted September 28, 2016 hi everyone i have a small issue here with my sand grains (wet grains) - i'm trying to get my mesh to collide with them but they seem to be jumping about a fair bit as the character moves. I'm not sure what i can do to adjust this jumping about does anyone have any ideas? playblast below to show you what i mean. I cant share the scene file right now sorry but the jumping of particles is quite noticeable here ip.mp4 Quote Link to comment Share on other sites More sharing options...
anthonymcgrath Posted September 28, 2016 Author Share Posted September 28, 2016 anyone got any ideas on this one ? Really seems to be giving me the red ass the grains initially seem okay them just seem to dance about - do i need to increase the number massively or something? Quote Link to comment Share on other sites More sharing options...
Hokmah Posted September 28, 2016 Share Posted September 28, 2016 try to play a little with friction of this character and ground maybe and see if it is working Quote Link to comment Share on other sites More sharing options...
anthonymcgrath Posted September 28, 2016 Author Share Posted September 28, 2016 30 minutes ago, Hokmah said: try to play a little with friction of this character and ground maybe and see if it is working cheers bud i had a go at that and no luck really it doesn't matter what settings i'm putting those to on the ground and/or the char it still bounces them about i've since found out i can calm them down by adjusting the pop grain solver max accel value - default 50 i toned it down to 15 - still getting lots of shifting about though sadly as if they're just popping from one spot to another after caching i pull the cache into a new node and I used a blast node or two on the points afterward to remove a good chunk of the annoying erroneous ones that seem to climb up his fingers and arm but still got some twitching and shifting about - could really do with knowing whats causing this as i've been at the sim for 2 days now trying variations anyone got any other alternative routes to try out? simpler node network perhaps to simulate sand grains ? Quote Link to comment Share on other sites More sharing options...
Shinjipierre Posted September 29, 2016 Share Posted September 29, 2016 ahah reminds me of a shot I did on Deadpool, anyway, you can try a speed limit, also, try geometry collision/volume collisions, forgot which one gave better results and remove the max accel, I remember this cutie not really giving great results 1 Quote Link to comment Share on other sites More sharing options...
anthonymcgrath Posted September 29, 2016 Author Share Posted September 29, 2016 @Shinjipierre - hey funnily enough I found this out yday evening. I don't know how to do a speed limit on the grains but I toned down the max acceleration and removed volume based collision and used the bullet collision on the object with concave. I also tweaked some scale kinetic and other Params and it worked a treat I have a much calmer simulation now that is a bit more wet sand but doesn't have the flying loose grains climbing up him. I'll get a playblast up a little later thanks again for your help! 1 Quote Link to comment Share on other sites More sharing options...
anthonymcgrath Posted September 29, 2016 Author Share Posted September 29, 2016 @Shinjipierre - i managed to really calm down my sand grains for my shot so as a little thanks i've attached a wip screen shot to give you an idea of how its all coming together in my shot thanks again! ant 1 Quote Link to comment Share on other sites More sharing options...
Shinjipierre Posted September 29, 2016 Share Posted September 29, 2016 Speed limit is just a pop node Another thing that can make grain go crazy is emitting them partly inside the collider, we end up having grains connected on both sides of the collider and it explodes 1 Quote Link to comment Share on other sites More sharing options...
anthonymcgrath Posted September 29, 2016 Author Share Posted September 29, 2016 27 minutes ago, Shinjipierre said: Speed limit is just a pop node Another thing that can make grain go crazy is emitting them partly inside the collider, we end up having grains connected on both sides of the collider and it explodes yep i were getting that initially and had to animate my mesh 'lowering' into the sand at the start lol. I guess in hindset i could perform some sort of blast based on whether they are inside the volume of the mesh or not but meh.. and besides dont know how ha! Quote Link to comment Share on other sites More sharing options...
ParticleSkull Posted October 26, 2016 Share Posted October 26, 2016 Hey @anthonymcgrath, I have the same problem here but couldn't fix it the way you said (still have to play a bit more with the scale kinectic though) Have you learned something else about this latelly? /Alvaro Quote Link to comment Share on other sites More sharing options...
anthonymcgrath Posted October 26, 2016 Author Share Posted October 26, 2016 45 minutes ago, ParticleSkull said: Hey @anthonymcgrath, I have the same problem here but couldn't fix it the way you said (still have to play a bit more with the scale kinectic though) Have you learned something else about this latelly? /Alvaro hi Alvaro my main things to twiddle were the static threshold and scale kinetic. also the max acceleration in the solver tab is set to 50 by default - i dropped this down to about 10-15 for my scene - this seemed to restrain alot of the flying particles. Attached a super quick scene that i created with the dry sand shelf buttons. Sorry i dont really know much more mate :/ dry_sand_tweaked.hip 2 Quote Link to comment Share on other sites More sharing options...
ParticleSkull Posted October 26, 2016 Share Posted October 26, 2016 Great! Thank you very much, I'll try some similar parameters. Cheers, /Alvaro 1 Quote Link to comment Share on other sites More sharing options...
anthonymcgrath Posted October 26, 2016 Author Share Posted October 26, 2016 1 minute ago, ParticleSkull said: Great! Thank you very much, I'll try some similar parameters. Cheers, /Alvaro hope it works for you - in the scene i did the first thing i did was jump on the max accel setting and tone it right down and i was mostly there lol - if you set it to 50 and hit play you'll see weird 'blocking' of sand grains as they are shifted forward. If you sped up the anim of the ball you'd see the weird flickering of sand grains too most likely. Quote Link to comment Share on other sites More sharing options...
ParticleSkull Posted October 26, 2016 Share Posted October 26, 2016 Just did some comparision tests and, yeah, the max acceleration makes a lot of diference and with the scale kinect the particles tend to stay closer from each other. Quote Link to comment Share on other sites More sharing options...
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