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Found 120 results

  1. Fluid Boolean

    HI, How do i boolean(subtract or intersect) a poly soup? i wanted to subtract some of the part of my particle surface fluid. since the fluid is in polysoup, how do i boolean(substact) a polysoup. ?
  2. Hi all I am trying to simulate rain splashing on an already full tea cup, like the reference below. I have done a FLIP simulation which fills up the teacup quickly using an emitter inside the teacup, i have also done a basic rain simulation using the POP solver. BUT. i cant get the two to interact, the rain needs to be splashing the water as it hits it but i have been struggling for a few days and just cant seem to get it to work. I'm guessing its because i have used a FLIP solver for one and a POP solver for the other, but i have tried making them both FLIP or both POP but i just cant seem to get it to work with either. I don't know a huge amount about particle simulations so i might be being really dumb here but can anyone give me any advice or spot anywhere where i have gone wrong? I've attached the scene file and the geometry .obj that needs reading in, along with some screenshots of my nodes. Any advice would be amazing! Thank you in advance! rain_issues.hipnc teaCupV3.obj
  3. Hi All! Are there any ways to optimise/reduce the file size of Houdini caches. I'm caching a (very small) FLIP fluid sim with a 'File Cache' Node at the moment and each frame is about 100MB. Multiply by 500 frames and that's a BIG cache! - not to mention the time its taking! I am sure it shouldn't be this large considering this is only a very small fluid sim so any tips would be great! I know a lot of people have this issue with sims so hopefully kind people can help us out! Thanks in advance!
  4. Bottle pour into glass.

    Beginner houdini user here. Trying to learn small scale simulations has been a struggle so far. It's been far from a logical journey so far i must say. The simulation i am working on is a bottle of beer poured into a glass and then the bottle is set down on again. With lots of iterations i have managed to get the first state of the pour to a good look i think. however i know want to set the bottle down again and that is when things start to get funky. The flip particles seems to increase in velocity when moving the bottle back and down again, resulting in them spraying out in control upwards. I have no idea what is going on and why, been trying different settings for quite some time now so if someone has a pointer in the right direction that would be awesome! Attaching a compressed scene file with all the geo and also a flipbook of it. beerpour.rar beerpour_v008.mov
  5. RBD Fractured Obj with FLIP?

    Hello! I'm doing R&D for a project that will involve and egg breaking, releasing the yolk/white. Right now I'm just trying to get the principles down. I am currently just testing fluid inside an egg (making sure it stays inside when it's supposed to and falls with the egg in gravity) and am having issues with the fluid disappearing or leaking from the egg. I am used to using rbd packed objects for destruction so I started out my workflow with the egg as an rbd packed object, but saw some examples on here that suggested using an rbd fractured object so I have tried that as well. When I use the egg as a packed object, the fluid seems to just slowly disappear over time, and when I use a rbd fractured object the fluid sticks to the eggshell on the second frame and then flies out. I know the eggshell is thin geo for being a collision object (it is accurate to a chicken egg), but even when I thickened the geo I still had fluid disappearing. Any advice regarding using fluid inside rbd objects would be appreciated! egg.zip
  6. Fluid is not flowing

    Hey guys, my problem is, that my fluid won't flow down... I think that is because my emitter is to small, or could it be something else? Milchkarton.hiplc
  7. sticky slime

    Hello guys. i was trying to make sticky glue, that 100% sticks to two objects (never peals of). I have two boards, each with piece of slime, as they touch, slime should join and as they move apart, the slime should stretch and break apart (but never peal off from board). I did spend some time, investigating, but im having hard time to force the slime to stick without pealing. anyone can point me in better direction?
  8. Advice needed for pyro sim

    Hi Guys, I am currently working on a shot where I need to simulate an object falling slowly through deep water whilst bleeding (The more blood the better). Initially I began with a pretty simple setup, An emissive object, a collision object and a divergence volume which is being used for expansion. The problem I am running into is that I need the smoke to continually expand, whilst becoming more diffused and transparent, but to always remain in the sim. So I have disabled dissipation as I don't want to lose density, but this leaves me with a dense volume which isn't transparent or diffused. I would like the density that is in the sim to have an aged based blurring. I did try to achieve this with a gas dissipate and heat field but this still wasn't right. I have also spent time trying to tweak the pyro shader to achieve the desired effect but I am not having much luck. Below is an example of the look I am trying to achieve. Between 0:21 and 0:34 Any advice will be greatly appreciated. Many thanks, Clive Blood_in_water_odforce.hip
  9. Flat tank n00b - Why isn't my boat wake working?

    Hello! I'm trying to create the wake and white water created by a boats engines/propellers. I've made it work by adding forces from a PointVOP into a fluidsource, but as soon as I change the Particle Separation in the flattank_initial, it stops working. Also, when entering the node containing the plane from which I create the force, the perspective gets all weird. In the attached file the forces do not work. It's a super simple setup, but as this is my first attempt at Houdini, I'm stumped. Any and all help would be greatly appreciated. Attached: Workfile, Indie Limited-Commercial license. Tug_Sim_V06.hiplc
  10. Hello, I was wondering if anyone had any suggestions as to why my flip fluid sim seems to "compress" as my container moves. Any help would be appreciated. Thanks!
  11. Flip Fluid Collision Problems

    Hello! I am having a problem with collision for my flip fluid sim, frame 2 for some reason a chunk of particles falls through the bottom of my "cup" I've checked my collisions on my "cup" and I've also tried adding a sub d node in my tree. both didn't have any result. Also, as the sim continues my particles pretty much all disappear. I'm pretty new to water sims so I'm not really sure the problem. Thanks!
  12. Cofe with foam/bubbles on top

    Hey, I have to to some fluid stuff for a cofe. It needs to have some cream/foam/bubbles on top. It shall run in from the top of the glas and generate that stuff on top. Pretty tough deadline. Any ideas on how to approach this in an efficiant way? Maybe using the surface field and change the chading on top depending on the distance? Any tipps are appreciated
  13. Didn't you think of these fluid solvers? How are they made? How to build them? We will talk about the theory of the process of building fluid solvers in my new course understanding fluid solvers on MIX Training. This is volume 1, volume 2 soon! http://mixtrn.com/course/understanding-fluid-solvers-volume-1/
  14. Fluid Follow Curve

    is there away to control the force along the curve want the force on the end of the curve is much higher than beginning of the curve, iam using Cruve to drive it by curve force, btw curve is not converted to poly or Volume hipfile Fluid_Juice.hip
  15. Hi guys, Any idea why there is a bump kind of a crease there where the ocean extension happens?
  16. Turn fluid to soild

    How can i pour liquid into a container and then turn it into solid jell-o ? Thanks in advance.
  17. Gently wobbling fluid and foam

    Hi. I'm new to Houdini and wondering how would you guys approach something like this the simplest way: Wobbly fluid example I don't necessarily think that flip is needed for this. Maybe there is a much easier way (like animated booleans) but the foam part is what concerns me. The example looks like it is a texture but I'm not sure if live booleans can have UVs. Anyway I'm just thinking out loud. Any ideas would be highly appreciated. Thanks! wobbly_fluid.mp4
  18. Looping Fluid Simulation

    Hi I made a water tornado, the movement is just like a tornado, rising from ground but I used flip particles and the pop axis force to generate the orbit and lift force. After a certain frame, I would like to let the simulation loop but without increasing the height of the water pillar. Basically, the pillar stops rising but the flip particles still behaves dynamically. Is this possible? How would I go about doing this? Thanks
  19. apply noise to flip fluid source

    Hey! I'm trying to replicate some sort of noise on my flip fluid emission volume in a volume I can use a volume VOP to multiply the density and create some interesting shapes that change over time, but when I emit flip fluid I have this fluid source and I couldn't find a way of eroding it to get a much nicer and organic shape. I'm introducing some noise on the emission speed and that works well, and also I'm applying a mountain SOP to the original shape to break the surface, but I still miss some noise on it. Any idea? fluid_source_noise.hipnc
  20. Hello! just wondering what's the best way to gradually decrease the amount of fluid emitted by an object...is there any way of multiply the emission volume by a noise that slowly goes to 0 in amplitude?
  21. Hi! Just sharing another work of mine, this one took me a lot of time and I like more what this setup can achieve than the result that I got , but at least I finished. Hope you like it!!
  22. Hey everyone,My overall goal is to simulate liquid poured into a glass with ice cubes inside, with the ice cubes floating.Everything works normally until I enable feedback forces: Normal: https://gfycat.com/LameCarelessIzuthrush With feedback: https://gfycat.com/FlashySolidFreshwatereel There's a ton of particle loss. For these sims, particle separation is 0.004, grid scale is 2, feedback force is 1, and max FLIP substeps is 10.The best I got was to maintain volume with 1.75 grid scale, but with overreacting ice cubes: https://gfycat.com/MiserlyEmbarrassedAfricanbushviperI've attached the Houdini file for this below.Anything related to this problem would be helpful. Why is there particle loss, even without reseeding or with many substeps (I've tried using 20)? Is there a problem with how I'm using feedback? Why does changing grid size cause volume to increase or decrease?Thanks! ice-tea-milk_027_017.hipnc
  23. hey houdini users, i'm doing a flip simulation for strawberry falling into chocolate but i cant figure out the right surface tension for viscous fluid and i don't know how houdini calculate Surface Tension or how to find the relation between liquid mass-density and surface tension ? and also does houdini calculate it in millinewton per meter ?
  24. hey houdini users, i'm doing a flip simulation for strawberry falling into chocolate but i cant figure out the right surface tension for viscous fluid and i don't know how houdini calculate Surface Tension or how to find the relation between liquid mass-density and surface tension ? and also does houdini calculate it in millinewton per meter ?