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Found 382 results

  1. Houdini ocean explosions

    Hey guys, I'm pretty new to Houdini. But I'm looking to create an ocean explosions almost like a bomb going off under water. I have a flip tank and an deforming mesh that replicates the exspolsion, however I cant seem to have the mesh interact with the flip at all. I'm sure I'm doing this very wrong so hopes you guys can help Cheers ocean_explosions.hipnc
  2. guided ocean from animated geometry

    Hello this question was originally asked here (and I hav https://www.sidefx.com/forum/topic/46028/ "I am wondering if it's possible to simulate a thin layer of ocean from any given geometry mesh in houdini?" Or from my input mesh that is a deforming animated plane? It is basically wave previs anim from Maya -- I am looking to drive a flip sim with this animation similarly to bifrost guided parameters: In the sidefx forum I linked someone mentioned "- detect position of flip particle if it is below or above the surface if below the surface but the distance with the surface is below a certain threshold advect it by the point velocity. if the distance is more than the treshold it get deleted every frame." I was wondering if someone can headstart me with how to go about this implementation, does this process need to be done within the solver? Thank you all for your time! -Shane
  3. Hello magicians, I'm working on a large scale FLIP scene and need some tips regarding to workflow. The main scene has 2 FLIP sims, 1 for a waterfall, and 1 for a river. On my current setup I made the river using narrow band, and the waterfall using a emitter, not sure if this is the best workflow in terms of speed and direction, the current setup looks like this (blue = waterfall / red = river) And here is a viewport sample Questions: 1) Is this the best approach for mixing a waterfall with a river? emitter + narrow band? 2) I saw in other post that some people breaks the geometry in equal modules and then put them together, should I break the river within 3 equal parts to save time and quality? 3) I readed that when you export particles, is useful to delete attributes that won't be used, I did a quick test with all attributes and 1 frame was 800mb, deleted some and took it to 200mb, is this a right approach? 4) For final meshing, should I create VDB / polygon soup and export passes in order to make detail stuff like foam? 5) Should I export particles in wedges? 6) There is a dop workflow to upres particle/flip mesh like "gasupres" within pyro? Would love to hear any tips regarding to large scale flip, will keep reading on the forum in the meantime Thanks!
  4. flip particles follow the surface

    Hello everyone! I have a question that is how to make the flip particles follow the surface flow.look like this viedo.
  5. Hey magicians, I'm working on a flip river wich I need to have color attribute, followed H16 Flip Masterclass and get there, but then I tried to add color in several ways but I can't get it working. I tried adding a sop solver to dops with attribute transfer, but the color didnt worked on the motion. Also tried making source volume with points from volume with uv texture but velocity gets weird. Working river without CD Cd particles with weird velocity Any tips on how to fix this? attaching a hip. Thanks in advance flip_issue.hip
  6. Color in FLIP sims - milk pour into tea

    Hi everyone, I was thinking of creating a simulation of milk pouring into tea as a showreel piece, but I'm not sure how best to go about it. I have seen people using color in FLIP sims, however in all the examples I have seen, the fluid is shaded to be opaque (like different color paints mixing). In my case though, I'd need to be able to see the milk as it is poured into the tea and see it underneath the surface. Then over time, it needs to change the color of the tea. My best guess would be to simulate the liquid, and then create a separate smoke simulation for under the surface of the water. However I have no idea how I would integrate the two. Here is a reference video I found: Any ideas for this would really be appreciated!
  7. Flip Splash - Grid Scale Optimisation

    I'm doing a flip sim of a splash. My particle separation is 0.006 which produces 14mil particles so pretty low. However because its quite a big splash the bounding box of the sim gets quite large so by the end of the sim I have 600mil voxels in the surface volume and 115mil voxels in the vel volume. So this is crashing my machine (which has 128GB ram)... My grid scale is the default of 2 but the vast majority of those voxels will be wasted since there are no particles in most of the bounding box. Is there any way to optimise this? The obvious way would be to use sparse volumes in dynamics instead of Houdini's native volumes but I imagine that would be creating a flip solver from scratch.. Or can I increase the grid scale without it negatively affecting the sim too much (i'm going to test this now..) I've attached a flip book of the sim https://drive.google.com/open?id=1k3Kexf-DJ5_ULPLt6dpsfx5f9LtW2OVz
  8. waterman

    Hey guys!I want to make a waterman by houdini , Can you give me some advice? look like this one:
  9. Hi everyone just a QQ, I'm playing with some variable viscosity on a fluid sim. I have a simple object (torus) that i've added some aa noise to to drive the viscosity, that's all fine but when i run the sim and the fluid drops to the floor the noise texture doesn't stick to the fluid particles. the particles pass through the noise texture and so their viscosity changes every frame. same happens if i just paint the color onto the geo, once the i start the sim the color attribute stays static in world space and the fluid just passes through it (if that makes sense). Anyway Im sure its something simple im overlooking but any help around how i can get the noise texture in sops to map and stick to the fluid in dops would be awesome. Cheers.
  10. flip object explosding

    hey! I'm trying to turn a deformed box into a flip and let it explode (the deformed box is just to fake some numbers exploding into water). I'm looking into some way of applying a radial force to my flip sim, but metaballs doesn't work, not sure if I'm missing something...or if there's a smarter way of doing it... countdown_explosion_v002_t000.hiplc
  11. Caramel Goo Tear Apart

    Hi everyone, my first post, newbie to houdini but diving in! ive been trying to find the best way to achieve the classic mars bar chocolate caramel bar being pulled apart in close up detail, where the caramel slowly tears apart with strands becoming longer and thinner as it gets pulled. kind of like the classic bubble gum on the shoe type thing. FEM ive tried fem, but couldnt get it to become strandy enough and then completely tear apart. love to know if i continue to explore fem that it would be possible to make this effect. GRAIN SOLVER?? perhaps the grain solver with some noise determing the glue strength so natural tears become apparent in the grain block as they get pulled apart? FLIP: VISCOUS FLIP viscous sim perhaps might work? anyone experienced think this could be the way to do it? im hitting lots of newbie dead ends, so any help on which avenue will actually get me the desired effect, id be much appreciative. J
  12. hi, i have a shot where i need to make boat interaction particle . waves deformation mesh seq are already made in maya . if in real flow we have real wave with object interaction .it create particles,but its bit slow compared to houdini. is there a way to do it Houdini ??
  13. calm flip water in custom conteiner

    I'm trying to create simple fluid scene - calm puddle water in some ground hole and some rbd object goes up through this water. But I can't get really calm water - my flip particles can't stop during 100 frames and more. How can I fix this problem? my scene with some cache files attached below water.7z
  14. Hi, I have general questions about FLIP. For instance, there are splashes like an attached picture. If I want to change velocity or delete splash/spray, I think there are 3ways. The FLIP concept could make it tricky because FLIP contains particle and volume fields together. Thus, questions are: 1 - in general, if I want to change velocity or delete splash, do I need to modify the both of particles and field together? Or just modify one of them? 2 - It's kind of similar question as #1, but, when we use sinkFLIP and pump and sourceFLIP; 2a - pump seems to add velocity, but it's strange why source volume sets copy, and velocity sets normalized?? It should set source Volume none, and set velocity normalize OFF. Also, why don't we use pop node to change particle velocity directly?? 2b - sink seems to just kill particle, but why sourceVolume is maximum? It should be subtract although it's not exist.. And there is still surface volume exists after deleting particle... Can't we use just pop kill to remove waterVolume/splash? 3c - sourceFLIP looks just adding particle. I guess we can add velocity with particle together, then when it passes solver, it create water volume (surface field and vel field), then why don't we just use pop-source to add particle with velocity?? 3 - There is FLIP solver > particle motion > Droplets > and min/max particle Density. However, there is no density attribute. What density talks about and how they calculate density?? Thanks for reading a lot of questions!!
  15. Hello, I have a few questions about creating FLIP Splash particles and what is considered the typical approach to them. One issue I have is that I have a FLIP tank that's quite small. It works great for the actual FLIP(object impacting the water) and the waves tend to dissipate by the bounds. Of course Splash tends to go much further than that. What is the usual solution to this? Is it really just having your original FLIP tank bigger? That seems quite inefficient when you know you don't need that resolution of FLIP at that distance A common question i've noticed but no straight answers. Spray & foam always looks very "ballish" when settled when motion blur isn't taking effect. Is the solution really to have hundreds of millions of particles? I see that Houdini shelf likes to convert them into a volume but that volume always looks too wispy than no matter what density.
  16. Hi, rebels! I`m currently looking into some Houdini flip RND and I got this shot where I need to paint friction attribute on one side, e.g the water falls faster on one side of the ground. Is this a straight forward thing or is it a bit of a pain in the "!$ due to the nature of water? I attached a test file so you guys can get a sense of what I`m talking about friction_water_test_v001.hip
  17. Flip Fluid odd behavior

    Hi there! I'm learning Flip Fluids with Houdini Apprentice 16 and I did a simple test. It' just an animated character (from Mixamo) rolling over the water. But oddly the fluid start behaving in a strange way, both in the direction of the fluid and velocity, in slow motion, almost anti-gravitational way. Someone may know what could be causing this? Using only shelf tools. Thanks! roll.mp4 roll_water.hipnc
  18. HOUDINI FX- RENASCENCE PROGRAM PROMO VIDEO: Welcome, soldier! Are you ready to demolish buildings, flood cities or maybe, making a stadium sprout from the underground? These are just some of the things that you will be able to learn in Houdini FX Renascence Program. At Houdini FX Renascence Program, we train you to face any FX project successfully. We have tried our best to offer you the best material. This course has been meticulously structured to take your FX skills to the next level so that you will be able to find a job in a top VFX studio in the future or maybe, become a successful FX freelancer. Our commitment, as an online school, is to offer the best learning experience in the market. Therefore, all our content is available in English and Spanish. HOW IT WORKS This course will be delivered via video only. We will work on weekly projects, so will have to meet the assigned challenges. Keep in mind that these assignments will make up interesting material for your «Demo Reel». Likewise, we will give you access to the Facebook support group, where you can interact with your instructor and classmates. The course is divided into 4 modules: MODULE I The Awakening (8 weeks) We will start by explaining how to take your first steps in the software. The content is highly optimized to get you familiar with Houdini in a dynamic and productive way. We won’t talk about every menu or button; all this information will be explained on-the-go, along with the training. Our priority is to make you feel comfortable from the start. You will find out about the main nodes in Houdini, you will learn to move around the interface and we will teach you how to control points and particles (points, pops and grains). At the end of this module, you will be able to create simulations of rain, sand, snow, perspiration, sparks, ashes, confetti, fireworks, bubbles, and much more. This is not a lighting and rendering course, but we will teach you everything you need to submit your project with a perfect final look. MODULE II Fire Inception (8 weeks) Explosions, fire, smoke, clouds … everything you have been waiting for! This module is full of action. We will focus on learning to emit and control volumes, using of one of the most powerful solvers in Houdini, i.e., “Pyrosolver”. You will learn different methods to accelerate your simulations, always working as quickly and efficiently as possible. We will teach you how to create shaders that will make your simulation look realistic. Recycle! Every setup created during these 8 weeks, can be reused to create new scenes. MODULE III Rise of the Fallen (8 weeks) You will become a weapon of mass destruction! You will learn to perform different types of fractures and we will provide you with all the tools to control and choreograph your simulations. In this third module, you will put together everything you have learned so far to create complex scenes using particles and volume. Breaking objects, demolishing buildings or splitting a land into two lots, are just some of the challenges you will face here! MODULE IV Deep Dive (8 weeks) We will have to put out the fire after the chaos… This is the final module of the course, and here you will learn to work with FLIP, which is the Houdini’s solver to create liquids. You will recreate infinite oceans and simulate water. You will learn how to create foam, bubble and spray passes. Finally, we will teach you how to deal with the different viscosities to get simulations of blood, chocolate, honey, yogurt, caramel, etc. APPLY TO THE RENASCENCE PROGRAM NOW AND GET 25% OFF!* 399$ 299$ http://houdini.training/
  19. meshing slow mo flip fluid

    hey! I'm doing a product splash with a slow mo effect. I tried different solutions about how to retime the sim, and I'm pretty happy at the moment with the technique of timeblend / tiemshift. I was also keen on trying the substep caching ( so a more accurate solution, but slow...) . Anyway, as I said I'm pretty happy with the sim, but once I mesh the particles it seems like the mesh is not really consistent across the frame. Is something you don't notice at full speed, but in slow mo is quite important, especially with water where even a little change in the mesh dramatically modify the look of reflections/refractions. So what I'm doing is cranking up the number of particles (reducing the separation...) to get a more precise mesh. But I'm paying this in terms of sim speed...I was wondering if any of you has experience in this topic. I'm also thinking about changing the scale of the scene, is quite big at the moment (geos are from another software), maybe simming this at a proper scale will help sim_v003_t000.mp4
  20. Hello everyone! How would you go about making the bubbles generated from a whitewater sim to last a few frames on the surface of the fluid before being killed? Thanks, Diogo
  21. Fluid Explosion with Viscosity

    Hey guys, I was having a little trouble with my fluid explosion. I want it to be very similar to this but I'm having a few problems. 1. The ground plane doesn't react with the fluid. 2. I want the explode the fluid in a series of directions but for some reason, it is only going in one. 3. I can't seem to get it to burst. Instead, it keeps emitting I'm sorry I haven't done any fluid simulation before but really want to learn. Thank you! Fluid_Explosion_002.hip
  22. read back substeps

    hey! I'm simming a flip fluid sim and I'm writing out substeps to disk in order to do a slow mo effect. At the moment I'm having something like this for 4 substeps testretime.125.25.bgeo.sc testretime.125.5.bgeo.sc testretime.125.75.bgeo.sc testretime.125.bgeo.sc testretime.126.25.bgeo.sc testretime.126.5.bgeo.sc testretime.126.75.bgeo.sc testretime.126.bgeo.sc testretime.127.25.bgeo.sc testretime.127.5.bgeo.sc testretime.127.75.bgeo.sc testretime.127.bgeo.sc how can I read this info back and render it in mantra so that 125.25 becomes 126, 125.5 becomes 127 and so on? should I rename those frame by hand? or there's something smarter?
  23. FLIP Collision and behaviours

    Hello, I come from a Realflow background where you adjust the collision settings like roughness and bounce within the menus of the object of collision. In houdini there are 2 places where I see the same settings, and I don't know if both of them affect the simulation (if not, then wich one?): FLIP Object -> Properties -> Physical. Static Object -> Physical. In Realflow there was a parameter that easily let me escalate the intensity of the collisions, meaning that some objects would create bigger disturbance and higher splashes (not affecting the global forces on the scene). In Houdini I thought the equivalent was Velocity Scale on collisions, and I tried to change the value to 0 only to find out that not much changed in the splashes generated by the collisions... Any idea how to achieve this difference in intensity? Thanks
  24. FLIP Spray not colliding

    Hello every one, I am doing a regular FLIP simulation where I have my particles colliding properly with a passive object. I have added a whitewater dopnetwork from shelf, and I re-created the collision setup in there. When I add foam and spray, everything goes as expected, but the spray just goes ballistic and completly ignores th collision borders. In the capture below you have an example of the overshooting particles (the ones making the correct form are the regular corefluid FLIP particles).
  25. I'm having a bit of trouble with the diplacement working from the ocean flattank_fluid_extended node. I got the volumetric fluid to extend, but getting the displacement effect is giving me some trouble. I'm trying to get the volumetric fluid to follow the extended fluid plane's displacement, but it doesn't seem to follow when I point it to the /obj/flattank_fluid_extended/RENDER vs. the /obj/flattank_fluid/RENDER. What is missing in the extended node that doesn't give the volume the proper displacement? Thanks. This is a bit of a new system, so I'm a bit lost in the woods. The surface is working great, though, and I really love the new system.