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Found 348 results

  1. I'm using the Ocean Flat Tank Shelf tool to do a flip sim, and then render an extended ocean with the ocean displacement tools. Basically, trying to follow along with the example shown in the Houdini 16 Ocean tools masterclass. The issue I'm having is, when I use the Flattening tools on the particlefluidsurface sop, I get a lot of extra geometry below the surface. The default Extrude Polygons mode is planar and I get a lot of planes below the surface. If I change to Along Each Axis, I get the extra geo planes above the surface as well. Has anyone run into this issue? I didn't really change any simulation settings on the flattank_sim from what the shelf tool set up. I suppose it's possible the new narrow band settings are somehow breaking the flatten geometry tools? I should test with the narrow band turned off maybe but I would hope that wouldn't break the setup. I'm hoping someone else has seen this before and found a solution.
  2. adding turbulence to flip sim

    Hey! What is wrong with my setup? I am just trying to use a source volume node to add turbulence to my sim. However, I can't get it to work! Any help would be amazing. Thanks, flip.hipnc
  3. 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
  4. Hello Houdini Users, I am new around the forum, and have been exploring the software for some time now. I come from a Realflow background, where I usually would go for an open domain Hybrido simulation and the particles could leave the container freely. Now confronted with the FLIP Tank workflow, I realized that the waterline option kills the particles at the boundary, instead of them rebounding (I always get some rebound with just waterline turned on), making it look like the container's walls don't exist above that certain waterline level. To avoid the loss of volume due to the killing of the particles,I turn the boundary layer on and it looks like it somehow replenishes the particles, but it generates artifacts that I can't comprehend: -Just turning on the boundary layer and leaving the padding at 0 makes it look like it is not working at all, thus I still loose volume and get some rebounds. -If i set padding values like for ex. 1 (in x and z) I get jittery particles around the boundarys. Could some one explain to me how is the Boundary Layer suppose to work (very briefly), most specificly the "Padding" options and in what context should it be used? Thanks, Diogo
  5. Hey everybody, I'm following some lessons about the reworked ocean tools in Houdini 16, and made a typical FLIP sim of a boat on ocean. But when I plug my compressed flip cache into the Particle Fluid Surface node and select "compressed fluid surface", I don't get any surface mesh at all - just the particles from the cache. Has this happened to anybody else or does anybody know how to get it work.
  6. Floating Particles in Water?

    Hi there! I am currently a vfx student and very new to houdini! So far it's been tons of fun but I've come across a problem, basically I want to create particles like algae and dust floating in water, but I'm really unsure what the best way to go about it is. Originally I was just going to do a very basic particle sim with some currents going through...but that didn't really work out. So, how do I approach this? Any little bit of help would be greatly appreciated!
  7. Hey! In my scene (I think it may only work with 16.5) how could I use the sphere in my scene to be an additional flip emitter? The idea is to keep adding water to the top bowl. I want to use the top sphere as an flip fluid emitter. How would I set that up? Is it possible to have to flip objects going into one solver? Thanks water.hipnc
  8. 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!
  9. 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
  10. Hello Magicians out there. I am following up the Johnny Farmfield's tutorial Houdini - RBD to FLIP Johnny's set-up works fine with nodes but when I try to change the geometry to others, The sopsolver in the RBD_SIM make things won't work. When I bypass sopsolver, the rigid body sim works fine but Johnny's vex code @active = (@P.y < 1.25 + (@Frame/150)) ? 1 : 0; if(@P.y < 0.1){ removepoint(geoself(), @ptnum); } Is unavailable. could anyone tell me what is wrong with my nodes? Thank you in advance! rbd_to_flip.hiplc
  11. Flip Lava Flow

    I know I'm a bit late to the party with the lava, but here it is:
  12. Realflow user - Flip questions

    Hi, I am a Realflow user looking into Flip. I really like the narrowband effect in Houdini and I think this can be powerful. I am still a bigger with Houdini. The workflow with Realflow is: save your animation from 3dsmax as an SD file. Wire that up to the Domain you want to affect in Realflow and you have your fluid interacting with the fluid. How do I get an FBX or Alembic animation exported from 3dsmax to interact with a flip tank? To my knowledge, you have to convert the object to a static collision object for it to interact with the fluid. This works fine if the object is animated with Houdini but not if it is an alembic or FBX file. What is the workflow? Is it possible to make the flip tank from a custom object? Please see the setup in Realflow below that I want to duplicate in Houdini. https://www.dropbox.com/s/jayv6o6oa8d78gb/realflwo_tank.JPG?dl=0 Thanks!
  13. Hello! I don't know if this is normal, but it's really whoring my surfacing... During the flip simulation using the narrowband option, the level starts to drop thus changing the waterline which really messes up the surfacing part causing artifacts. Why am I losing particles during and the sim causing the level to drop? It's a basic shark swimming around using deforming object collision in a flat tank off the shelf :/
  14. 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
  15. I am trying to make a water tank using FLIP, but I am having collision problems. The tank is hollow inside, I intend to render it as glass, but when the water collides with the surface of the tank it disappears. I have had to use surface collision as opposed to volume because the volume collision does not detect the hollow inside, it simply makes the collision the outer shell of the tank. I have attached a hip file to show what is happening, as well as the obj of the tank. I have tried increasing the collision offset, but it doesn't seem to have any effect, plus I can't go too far with it because it will plug the hole I have in the center. Any help would be greatly appreciated. WaterTankTest.hiplc WaterTank.obj EDIT: I did forget to mention, I am on 16.5.323
  16. 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?
  17. Mask Flip Suction

    I'm trying to control the suction force for flip with point attributes. Eg: only want the suction force to work when an attribute is above 0 (in this case, the "suction" attribute, I created in the emitter represented by the colored sphere). The suction force however is created using a gas wrangle dop. How can I import this point attribute to work with this dop? flip_suction.hip
  18. Hi guys. I'm trying to achieve a covering cream effect with Houdini flip and I have two issues here. As you can see in the hip file I used a Pop Attract DOP in my simulation. One of my problem is though I append a Drag DOP the flip particles won't stop in a smooth fashion and it jitters all the way to the end. Also when I mesh my sim I can't prevent my flip to build random holes. Can you help me to fix those problems please. AttractingFlip.hip
  19. Add custom force to foam particles

    Hi all, Anybody know how to add custom force to foam? I try use popvop but it don't work. I check witewater solver, its looks like force always 0 when particles is foam. Thanks!
  20. Sticky FLIP on moving Object

    HI everyone! It's my first time here, I hope I'm doing it the right way. I'm practicing in a shot where I have a couple of cherries falling by gravity and hitting each other, releasing some droplets. In order to have the droplets following the surfaces I'm using Stick on Collision in the flip solver collision tab. Unfortunatelly, no matter how much I increase the values in the stick microsolver, the fluid start moving fine but after a few frames It starts getting off the surface. Is there a way to consistently transfer these velocities from the geometry to FLIP? The movie bellow shows what I've got so far. Thanks everyone!!! stiky_FLIP_test.mp4
  21. Hello, Houdini wizards! In Houdini 16, I'm trying to merge my FLIP sim with the ocean surface, but i'm stuck with the workflow. It seems like in the newer version of houdini 16+, save_spectra has "replaced" "ocean render". With houdini 15, all you had to do was connect the core fluid to ocean preview AND ocean render, and then use the fetch node and point to the ocean render displacement location. However, in Houdini 16, due to the different nodes for the "small wave", i am experiencing lots of problems creating the displacement maps. My viewport which shows the FLIP sim and the ocean waves is completely different to my render window! 1) What i did was that i saved the output file in "Save spectra" node. 2) The fetch export node is already sourcing from save_spectra. 3) Mantra node connected to fetch export spectra. 4) Created and locked the camera to perspective view. Now when i render, its only rendering the small ocean waves, and completely ignores my FLIP sim. What am i doing wrong?? Can someone save me? Thanks!
  22. Flip vs scale vs collision

    Hi people, I want to create a simple apple who drop into a water flip tank. -1 square in Houdini flip is 1 meter so i tried to make a realworld scale apple but it dont work at all my apple bouncing back violently from the water. Any suggestions please ? i tryed to flip sovler -> volume motion -> solver -> feedback scale to 1 but it dont seem to work Houdini 16.5.268
  23. flip reseed group new particles

    Hi all, I was wondering if there is a simple way to group newly seeded particles during a flip sim. The reason I would like this option is that I have a sim where I'm not meshing the particles but rendering them directly and the seeded particles pop into existence in an unpleasing way, so I was hoping to somehow scale them up gradually over a few frames. Thanks in advance
  24. Static Object BBox

    Hello Houdini Gurus, I'm going through Ocean and Flip tutorials and in order to expand my knowledge and understanding of the topic I play around with settings. Simulated Boat, converted to static collision object shredding Ocean Flip waves. For some reason, my boat is cut in half by some bounding box. Could you please advice which BBox responsible for collision Object? please see attachment
  25. FLIP - Slip on Collision Control Field

    Hey guys, What is the best way to use the slip on collision control field, to avoid viscous fluid of sticking on objects? I managed to do it with the help of a friend, using the gas match field + a source volume. it works fine for static objects but not at all for moving ones. I have a project with an alembic animation and I really need to use it on the animated surface. Can someone help me? Here's the setup in dops: Here's it working fine with a static object. It's a top view and the red box is the sliping object: and here the red box is animated, not working: Not sure if this is the best way to approach it so any other ideas would reeaally help me scene file is attached Cheers, Alvaro flip.slip.v2a.hiplc