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Found 72 results

  1. Hi Guys, I try to simulate a quiet river. But I got the problem that in the areas where the water is not moving at all(or is really really slow), it is moving up and down all the time and looks like little hills. It is not flat what you would expect.I know it is possible to do with other programs but has anybody a solution for houdini ? I tried already the swirl kernel, a sop to settle down the y axis(based on velocity) and a blending with a simple grid based on the velocity. Is there an official way in the simulation process? I am thankful for any advice
  2. Hello! I've been trying to render this scene but it is over my head when it comes to render the ocean from a bottom view. How'd you go about rendering this ? I have the standard small ocean preset created, created a simple hdr and fliped it. I also tried reversing the normals from the render grid so the displacement goes the other way around. Someone can give me a headsup ? Found this example aswell
  3. Hi There! I am trying to transfer my smoke and water sim from Houdini to Unity but I am very lost. Any ideas?
  4. Looping FLIP Fluid Sim

    Hi, I'm trying to loop a FLIP fluid simulation, it's a simple water container with various floating objects interacting with the water. I need to loop the sim and didn't have any luck with the "Make Loop" node from the Games shelf. Anyone know how to get this to work with a fluid sim? Thanks!
  5. Hi all, I am trying to make a whirlpool effect and i am doing it by creating a circle and then copying it into itself creating a for each loop where every smaller circle rotates faster than the previous then copying it downwards and tapering it to make the typical "hole" that is formed. I previously made a mistake where i copied the volume created from the effect and put it as the source of the water and got it working but the surface water was stationary, now that i have the surface moving but when I let the effect run it only "spins" the top layer of the water and doesn't go any deeper into the water , any tips? or any help would be appreciated. Whirlpool13.hipnc
  6. WATER DRIP

    Hi, I've been trying to make particles slide down a vertical surface but I want them to stop for a second while in motion, and then continue sliding again. I guess, I badly need help with this. Can anyone help me out ? I've tried animating the response feature in POP Behavior Detect but didn't work out. Each particle should have its own movement. Regards, David
  7. Hi Guys! So i'm trying to do this simple flip sim where i have an emitter inside a teacup and i just want to fill up the cup. It's is definitely water tight, the only particles leaving the cup are over the top, but as you can see from my flipbook the particles just start multiplying on their own when they land in the saucer, which is causing them to go everywhere. It is worth mentioning as well that the particles are only set to emit between frames 0 - 24 so i'm not sure why they're multiplying. Any suggestions as to how to stop this would be really appreciated!
  8. Liquid Titanium

    Hey guys Any idea how one would approach an effect like this? flip sim with high viscosity and directional force? I would love to do a similar effect with more compliacated geo. Thanks!
  9. Hi, Would like to know how this effect was being done, please throw some ideas or simple set up. this is the link: test_wave.hipnc
  10. Hi guys! I would like to share here my latest personal project. Everything done in Houdini and Mantra Hope you like it. Youtube Version: Shark_Youtube.mp4
  11. Hello. I'm sorry to disturb you because you're not my native language. Can't you give time shift in case of ‘white water’? So, how do I work with “slow motion”? I'm sorry to disturb your language. RND_Slowmotion.hip
  12. Hey magicians, I'm getting crazy here. I have a FLIP setup wich I did a compress cache, when I jump into white water it works fine. I send the setup to my client, he run the sim for compress cache, but for white water he is getting only in the waterfall and not the river. I think it has to be with some groups. Here's an image to illustrate the issue When I go to "White wate source > Out" the ww shows ok for both mine and client, but in white water import I get this, any tips to fix this? I can't make him run the sim again since we are almost in the deadline. Thanks
  13. Bending control

    A few months ago I was watching “Avatar, the last air bender” for like 5ft time and wanted to create some bending control, I'm still working on the water bending, so here's a WIP from this weekedn. Right now there's only to WIP, but will keep on with this until I master the 4 elements! https://vimeo.com/286783260 [vimeo.com] https://vimeo.com/272510944 [vimeo.com]
  14. Hey guys, I have a flip sim with particle div. at 0.03. Cached the compress and surface. So far all good. Now when I generate the white water, there are frames that go up to 3 gb (and its incremental), any tips for optimizing this? Some stuff I tried: - Creating a bound by object group, to delete particles that wont be used This optimized the size to almost the half Size comparison Another thing I tried is splitting up the "bubbles + foam" and "spray" in different bgeo files And finally I tried reducing the birth in white water solver as well as lifespan parameters. Is this normal? the size of white water tends to be big and increments over time? Any tip will be helpful, I have like 300gb for 1/4 of the animation just on white water
  15. Hey Magicians!, I've got a flip tank and I need a splash from a object that collides on the side of the wall, how can I get this effect? so far I faked by making 2 sims and merging but there's probably a better way to do this. I need to have the boundaries closed on the flip so I don't get "air" on the sim. This is the result that I get with the closed container and it needs that outer splash Any tip will be great! thanks!
  16. Hey magicians, I'm trying to use a cached flip mesh as source for white water, but when I run the whitewater dop nothing happens, any ideas? I also tried using my flip particle cache as source but I guess this overlapping issue Any ideas? Thanks!
  17. 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!
  18. Hi all, Do you know how to remove tiny water drops in fluid simulation? As you can see below, there are many water drops in the air and these are looks weird. I wanna kill that particles, but I don't know what I use among the various attributes. I tried remove points by vector speed, but it's not good result. Is there any way to kill the particles? or should I remove them manually by @ID? or should I simulate until particles looks good? Thanks in advance!
  19. 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
  20. 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
  21. Hi everybody, thought I'd throw up a simple file to demo the problem, In the context of rendering a flip sim mesh in mantra, with the env geometry as both holdout 'forced matte' and 'forced phantom' to have it still show up in reflections and refractions, I have a situation where by adding the object as forced phantom, it cancels out force matte. But as a work-around - it seems if I duplicate that same env geometry, by copy&pasting the sop, and setting that new sop to be the phantom and not the original, mantra renders as expected. Go figure... Cheers, Matt 01 Render with everything visible 02 forced phantom cancelling forced matte 03 both forced matte and forced phantom working after sop object duplication phantomHoldoutTest_v001.hip
  22. 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
  23. 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!
  24. 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
  25. 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
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