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  1. Hi guys, I want to simulate two (or more) boats in a large ocean, so I tried to use the "Wave Tank" from the shelf, but it creates a following fluid around one of them, and I don't know how should I add the second (or third) one to the sim. Most of the tutorials show how to make it with one boat. I think I should merge the "Particle Fluid Masks" of them..! I would appreciate any ideas. Two Boats_02.hip
  2. This one has me stumped - is it possible to move and offset (not retime!) Spectrums and corresponding Foam caches post sim? I'm rendering an Ocean in Karma but need to transform and offset it at render time. For previews I am timeshifting and transforming the Ocean Preview Grid with applied Spectrum, moving it around in camera to art direct where a wave is along with its Whitewater foam cache etc. Works great, can easily take a long cache, offset it, move the whole ocean closer or farther from cam as per supervisors needs without having to resim etc. Realized at render time, simply doing the same to the Spectrum wont work. Thought to offset the Time in Spectrums but that of course just made totally new patterns in the waves. And cant move it with a Transform really can you? I am worried the only way is to bake the geo then move and offset? To be clear, I dont want to retime, or change the look or speed of the sim at all. I simply want to take the cached foam and its corresponding ocean (which works when the spectrum is baked to geo and then moved), and move it in space, and offset its cache a few 100 frames so Karma renders it correctly. Cheers!
  3. Hi! I used displacement mask for redshift in Houdini.But there was such a problem.I don't want displacement where I mask and blend into the ocean smoothly. You can see the problem on the edges of the mesh in the first photo.How can i fix this? I shared the displacement mask and material setups below.I will be glad if you help.Thanks in advance.
  4. As you can see I used a guided ocean layer from the shelf, But the interior volume doesn't obey the extended surface size. How can I fix that?
  5. Hi everyone, I am having an issue I never had to deal with before, since I used to use Arnold and just render from Mantra for many years. Basically I have a few spectra on my ocean and some of them have the volumes going really high (around 30 milion voxels or so) and I was wondering if there is anything I could do to ressample these volumes and not make them as heavy, without losing too much detail. Any ideas? Thank you.
  6. Hi all.. I'm trying to find the solution, how to control water (or whitewater) shape behaviour around the floating boat. I would like to obtain shape like in top picture on the left. But my results always looks something like on picture bellow, (very extensive side ripples) which I don't want to. Nobody in tutorials or PRO courses doesn't explain how to control that behaviour, if I don't want leave simulation to work 'naturally'. I think it has something to do with the custom velocity values, but I had no good result with my experiments. I saw some tutorials for Maya's or Max's PhoenixFD, where was really good looking results. So, does anybody know, which parameter, feature or node is responsibile to control that, if I want to avoid natural behaviour and obtain the shape like on top left on the picture? ps: The top picture simulation made somebody in Houdini (all boat floats is 58 km/h) with some personal 'KA_wave' tool, which doesn't exist for commercial use. ..I can pay for explanation or shared example hip file..
  7. Ocean experts - what is really the difference these days between a Guided Ocean and just a Wave Tank? Are Guided Oceans just legacy and no use anymore? Pros and Cons? Cheers!
  8. Hi, I am getting white spots when i add any lights(spot,distant etc) on the ocean surface. Also after using the lights a lot, the displacement also goes at several places. I wont be able to post the file but i can post the setting images or whatever else is needed. I went through other forums but sadly they did not work well. Reducing the color limit did not work. Any help would be appreciated.
  9. I posted about this on the sidefx.com forums and got no response. This is about a feature that SESI has shown and discussed in the Houdini 17 Launch Presentation video. I'll link to the original post and copy it below. https://www.sidefx.com/forum/topic/61375/ "In the Houdini 17 Launch Presentation video https://vimeo.com/293116223 [vimeo.com] at around 1:20:00, Scott Keating briefly shows and mentions using the whitewater solver for spray and foam with only a deformed ocean surface (no underlying FLIP sim needed). I can't seem to find anything on how to actually do this in Houdini 17. The whitewater nodes and shelf tool still expect a FLIP sim. Can anyone point to what I am missing?" Anyone know how to do this? Or at least can confirm that this feature is missing? It'd be great to know either way. Thanks!
  10. So I have been trying to emerge a temple from under the ocean. but I keep getting this weird collision when it comes from below the water. Looked everywhere if anyone had the same issue, but couldn't find anything. The model is from kitbash and I believe I clean it up and polyfill it so it is watertight. I tried to use another geometry like a super quad from Houdini and that created realistic collisions. Not like in the picture. It seems like it is using the whole bounding box of the vdb of the temple to move the particles. I have collision detection in the solver as Move outside of collision Ocean_emerge_02.hiplc
  11. HI, I'm just struggling trying to undersatnd the way he coiuld modified the idea of wave instancing backu up some attribute in order to use them at rendertime (Arnold) timestamp 3:17:36 i understand how to sample some attribute like frequencie, chop etc but didn't get the idea of wave instance and noise as attribute as he showed in the talk. eventuel someone can point me to the function in Ocean.h to sample those attribute. Thanks a lot for your help Cheers Farid
  12. My ocean foam particles are not flickering, but for some odd reason when I render the foam shader flickers as can be seen in the attached video. Does any one know what's going on here? tmp.mov
  13. Hello As I was going through some tweaking of my Ocean scene, I have discovered a problem. Why my flip fluid area has a different color then my extended ocean?? I have done a few times ago the same things but sometime this problem had appeared! :/ would be nice if someone knows the answer how to tackle this!? thanks!
  14. I'm trying to create an animation of a ship rising out of the water and simulate the water on it. But the animation is so fast that sails and thin ropes are not recognized as collisions. Perhaps raising the substep is a good idea, but is there any other way? Ideally, the collision should be as clean as this
  15. Hello community, I am doing a SpaceX starship rocket landing on an extended ocean (flip sim integrated), right now I am working on the rocket exhaust which should interact with the flip simulation. 1. I have created the pyro simulation of the exhaust flame and now I want to add this pyro flame sim to the rocket model where the exhaust should be. 2. I have done a point expression for the pyro cache, it has worked out. BUT now, when I want to render it, the flame is staying on the grid and isn't on the rocket. I hope you understand a bit about my idea. Here is a screenshot with the problem. here is the hip file with the 3d modell https://drive.google.com/drive/folders/1Q_c7VAu4qidMzSdMLl7IBvPs3VeqTlMi?usp=sharing I would really appreciate help, because I have set a deadline for my own and I want to reach it!
  16. Hello there, I have a few problems here: I am trying to make a unlimited ocean scene which I have done without any problems. But now, on the ocean horizon, the water is white for some reason, and I just don't know why it is white, a bug, or I'm just doing something wrong. I tried to make all the bakes in one folder, but it somehow helped, but somehow it did not. I tried to change the parameters in the ocean spectrum, and then bake it again, it helped for some time and then the water was still white. If someone have time, you can take a look on my scene file and the screenshot with the problem. and also, when I try to make a flipbook render, then the flipbook is just rendering the first frame and after that it stops and when I try to render the scene with mantra, then mantra isn't rendering at all... here is a screenshot of the ocean problem and the hip-file: https://drive.google.com/drive/folders/19F8rb7mvUHI_7TNgVI9TzrNU4nlvWcSu?usp=sharing I would really appreciate the help if someone could figure out why it isnt rendering with flipbook and mantra and also the ocean problem.
  17. Hi, I have a big splash into a large ocean extended and I would like to render separately de mesh into the mask and the other one, but I can't find the way. Does someone know how can I do this? Thank you very much.
  18. 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.
  19. Hello all, I am working on a Ocean scene right now, I have created a unfinite Ocean but now I have a problem. So, there is these strange pattern in the ocean (like in the picture). And now my question: How can I get rid of these patterns? what i have tried so far: 1.) I have try to mix two Ocean spectrums, it hasn't worked... 2.) I have try to turn on the make in the mask tab in the ocean spectrum, i hasnt worked too... is there a straight forward option to how to this??
  20. say i have a ocean ,i need do some deform in the ocean surface shader , transform the space from current to object ,then i did some deform work ,then transform it back to current space ,give the new surface position to shading normal , the render have this prob , i think my way is wrong , someone who familiar about it pls help me . appreciate it . i did a simple hip file show this question , you can download it ,in the shader ,put a aanoise plus with object position ,you can switch it between normal and wrong . you can regenerate you ocean spectrum . thanks ! deformOcean.hip
  21. Hello folks! I used default shelf Guided Ocean layer tool that provided me with the right set up I needed to recreate the moving vessel. The problem is that the waves coming from the Spectra are evaporating over time in sim becaming less and less pronounced. Why is that happening? I tweaked almost everything and ended up with no solution. Any tips?
  22. I am creating a long animation of a boat on an ocean surface. I am using the new guided ocean surface with Houdini 16 to make use of the extended fluid surface blending to an infinite ocean. I am encountering a couple of problems, one being that as the sim continues the boat becomes a submarine due to so much fluid, but also, relating to the topic of this post, white water emission is occurring everywhere making blending into the ocean a problem. The question is, how to I use the volume mask created by the particle fluid mask node to reduce the velocity, curvature, and vorticity of the compressed fluid sim so that the white water emission will blend better with the infinite ocean? Any insight would be very welcome. Thanks
  23. Hi everyone, I apologize in advance if this is not the right section to post this. I'm trying to find a solution to use Houdini Ocean Tools in Vray. I have the basic scene with the giant grid, which in Mantra is displaced at render time. At first I connected a material node with a basic Vray shader (without any displacement) after the Ocean evaluate node (I know that I will have a gigantic grid with many subdivisions but that isn't a problem) but it doesn't seem to pick up the full displacement value. Then I tried to export the textures from the Ocean Evaluate node but I'm having a problem with the displacement in the Vray shader. Has anyone ever achieved a realistic look with HOT in Vray? Thanks for the help
  24. Hey I have some issues with my scene. As you can see in the image, the ocean looks strange. Also there are a lot of tiles repeating again and again, also inside the Non-Region. In this render the wave high is okay. But in other stuff it is not. You can see this here: Not only that the wave is too high (I do not find where the change this or I do not have a result inside the viewport idk), it looks like the water goes threw the ship hull, which would look weird. Any ideas on how to fix this? Edit: I also have the issue that the ocean flat tanked created the water not in the central where the ship is. I tried to fix this but nothing really work. Honestly I do not know the reason why it went this way anyway. I think Houdini is a very powerful software, but I am new to it. As always it will take some time to learn but helping me with this would really help
  25. Hi everyone, I want to render extended ocean with renderman, and I am not sure how to set up spectra and mask bgeo sequences in Pxr surface shader.
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