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Found 52 results

  1. 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
  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. 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!
  4. 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
  5. 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
  6. Hello! I'm new to Houdini, please help!!! I need a small tornado from the fountain that enveloping the character's arm. I try to do this in a simulation, but I can not get a stable beautiful shape. I've tried to do custom velocity field like that too (https://www.youtube.com/watch?v=z19fxCbe2Eg), but still don't get stabil tornado shape. Also,I noticed that if I make a simulation in real size, then it is even more unstable and not beautiful(maybe I'm doing something wrong). The tornado should react to changing the position of the hand (hand is mooving back and forth). And do not know how to achieve the shape of whilrpool,as at my picture. Please, help! armGeo.obj armFX_experinemtal2.hipnc
  7. Blood in water

    Hi Guys, I am struggling to achieve a believable blood in water effect. I was hoping someone could give me some tips or advise to help steer me in the right direction. Currently I am using a pretty simple pyro setup and sourcing a custom vel field, in an attempt to simulate underwater turbulence. I am also wondering if I may be approaching the problem in the wrong way and if there is a better solution. I've attached a scene file incase this helps. I have posted an example below of the look I am trying to achieve. Between 0:21 and 0:25. Essentially the blood flowing from the chunder and dispersing. Many thanks, Clive Blood_in_water.hip
  8. 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!
  9. 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!
  10. Hey guys, I've been trying to use the extrude polygons feature of the Particle Fluid Surface, but the bounding box makes my meshing weird, even tough my mesh looks fine without using the bounding box. Using the BBox, on the first four frames the mesh just goes away and I also get some gaps between the mesh from the flip and the mesh from the extended. Since I need the Bounding Box to extend my ocean using the Particle Fluid Surface node, and that's acting out, I'm looking for some good alternatives to that. Does anyone has any suggestions?
  11. Water drop splash

    I know that houdini 16 have cool water drop splash system and there is few tutorials about this kind of effect but maybe someone was trying to achieve this kind of splash when fluid drop falling down and collide with static object, not with the tank like usually on tutorials? I'm trying for two day create this kind of effect usually adding some forces but it is flat :/
  12. Water sim with bubbles

    Hi Troops One of my first sims of water pouring into a glass (and with bubbles.) Not sure there isn't any motion blur on the bubbles and I had trouble having just a few bubbles at the start and grading to more at the end even though I keyed the scatter node. Anyway, here it is. C&C always welcome. Peace Josh Whiskey_Bubbles.mp4
  13. Flip rendering

    Hello everyone, I'm beginner in water simulation and I would like some tips if it's possible. For the simulation part, I'm not in trouble for the moment, but the rendering it's another thing. I'm trying to make an ocean flip simulation of a submarine going out of water, for the ocean shader, I have something pretty good now with ocean spectra and the ocean shader of houdini 16. The problem is the whitewater, for the ocean surface (the flip mesh) I don't know how to do the white part like in the sreenshot, is it particles, or tweaking the shader with velocity or vorticity, but which parameter in the shader (refraction?) ? And for the foam, spray, bubbles , I have to render simple particles or do another thing? Thank's for your help, I want to learn water, it's very fun to do! I let the breakdown of the screenshot here
  14. !ZLS Productions is looking for a Houdini artist for a project based remote job. Project includes: - Beach tank simulations - Ocean tools with flip fluids (jetsky and large waves) - Grass creation - Shading and proper render setup for the above - Scene setup, environment development Project will start in the very near future, please, apply only if you are available for immediate start. Send your relevant reel here: info@zlsproductions.com
  15. Hi everybody, I'm making a water explosion, I already have the water column, the splashes, but I want to this collide with an Ocean Flat Tank. Like that, I'll insert this flat tank in a Large Ocean with a displaced grid. But the problem is, my emitted water for my column doesn't collide with my tank. I saw that to make fluid collide, we need one FlipSolver, but two Source Volume. But in this case, with a flat tank, displaced by wave, how can I achieve this ? Anyone has an answers ? Cheers, Gael.
  16. Hi guys, I'm started on a H16 sim where I have a cup of ice and fluid and another piece of ice that will dive in and float back up (animated). I've almost always dealt with larger water sims and don't have much Houdini experience with small scale sims I figured some people here have experience with such simulations and would like to ask if there are any best practices and tips here? I have some questions myself 1. How important is it to try to simulate and keep everything to scale for rbd and flip sims of this sort? I have found in my initial bullet tests that just trying to fill the glass with ice at scale tends to give me exploding rbd sims. In this case, I had the ice cubes and glass modeled in maya. When I brought it into Houdini I scaled it down by 100x to match the meter scale in Houdini. I tried adjusting the collision padding to stabilize the sim but to no avail. I had no issues when I worked at 100x scale. I'm curious if anyone else has experienced this? However, not working to scale meant that my flip sims feel larger in scale, like a swimming pool and not a cup. Increasing gravity 3x has helped the sim look more to scale. But that seems very arbitrary to me. I'm more inclined to work at a bigger scale as adjusting to smaller scales have given me all kinds of problems from unstable rbd sims to leaking water particles and decreasing water levels. 2. Is flip the the recommended approach for these fluid sims? I've seen sph being recommended. But honestly, I don't even know where the sph tools are 'hidden' these days in Houdini. And I know these days SideFX recommends flip for everything. 3. What is the best way to get some of the ice to interact with the water sim? Via density and flip solver feedback or the bouyancy force dop node? 4. Any tips on dealing with collisions and keeping things water tight in a thin lip glass that still needs water to splash out of the glass? When testing, I often found that it was very easy to leak fluid from the container even though my flip collision guide shows that there isn't any holes in glass collision. 5. Any tips in meshing the fluid with regards to lighting and rendering? I've seen it recommended that the water geometry be slightly larger then the glass. How are folks doing that with flip sims? I'll try posting an example file whenever I get to a good point. I really would like to benefit from the experience of folks who have done this sort of sim. Thanks in advance.
  17. FX Animator- Houdini Arist Needed

    FX Animator If you are qualified and interested please email Angela at ageier@laika.com with your reel and resume. General Summary The FX Animator is responsible for creating Character and Environment FX, and elements for lighting and compositing to support of the visual style and narrative of the film. They will also be involved in the collaboration of creative and technical tools and workflow. Essential Job Functions Design and create the look of computer generated FX and elements through shot production. Under the supervision of the CG Supervisor, VFX Sup and/or Director help establish and follow the look of the film. Troubleshoot creative and technical issues. Partner with the Modeling, Texturing, Lighting and Compositing and help support each departments’ FX integration issues. Maintain a high level of quality while working on multiple projects, both looks development and shot production under aggressive deadlines. Perform technical work in support of shot production using various production tools. Qualifications Bachelor’s degree in Computer Science, Animation, Art or other relevant area of study and/or equivalent job experience. 3+ years of high-end production experience in television or feature films as an FX artist and/or TD. Experience in producing effects such as smoke, fire, clouds, water, steam and explosions. Knowledge of applicable software and platforms including Maya, Renderman and Houdini REQUIRED. Working knowledge of Digital Compositing in Nuke. Experience with advanced lighting techniques such as Global Illumination, HDRI, subsurface scattering and real world lighting set ups, a plus. Experience with 3D paint packages, a plus. Modeling, Texturing and/or Lighting experience, a plus. Disclaimer The above statements are intended to describe the general nature and level of work being performed by people assigned to this classification. They are not intended to be construed as an exhaustive list of all responsibilities, duties and skills required of personnel so classified.
  18. FX Animator- Houdini Arist Needed

    FX Animator If you are qualified and interested please email Angela at ageier@laika.com with your reel and resume. General Summary The FX Animator is responsible for creating Character and Environment FX, and elements for lighting and compositing to support of the visual style and narrative of the film. They will also be involved in the collaboration of creative and technical tools and workflow. Essential Job Functions Design and create the look of computer generated FX and elements through shot production. Under the supervision of the CG Supervisor, VFX Sup and/or Director help establish and follow the look of the film. Troubleshoot creative and technical issues. Partner with the Modeling, Texturing, Lighting and Compositing and help support each departments’ FX integration issues. Maintain a high level of quality while working on multiple projects, both looks development and shot production under aggressive deadlines. Perform technical work in support of shot production using various production tools. Qualifications Bachelor’s degree in Computer Science, Animation, Art or other relevant area of study and/or equivalent job experience. 3+ years of high-end production experience in television or feature films as an FX artist and/or TD. Experience in producing effects such as smoke, fire, clouds, water, steam and explosions. Knowledge of applicable software and platforms including Maya, Renderman and Houdini REQUIRED. Working knowledge of Digital Compositing in Nuke. Experience with advanced lighting techniques such as Global Illumination, HDRI, subsurface scattering and real world lighting set ups, a plus. Experience with 3D paint packages, a plus. Modeling, Texturing and/or Lighting experience, a plus. Disclaimer The above statements are intended to describe the general nature and level of work being performed by people assigned to this classification. They are not intended to be construed as an exhaustive list of all responsibilities, duties and skills required of personnel so classified.
  19. Hi Have a simple scene with some splash geometry and a cylinder in the center lit by 2 area lights. I've increased my Max Trace depth for both Reflection and Refraction in my RS ROP to 7 each but still it seems my water splash lacks transparency. Can any Redshift users have a look at the attached .hip and suggest what I am doing wrong? redshift_test.zip
  20. My Latest Houdini works

    Hello Guys Im Ahmed Saady - Houdini FX Artist based in Iraq now i would like to share with you my latest houdini projects i have done and i hope you like them Also i'm available for freelance remotely work or full time position ahmedstudios@gmail.com Copa America Identity 2016 - beinsports Copa America - mainstudio 2016 Building Destruction - R&D All the information regarding of the houdini work is under each video description Thank you!
  21. Hi all: i'm working on a shot which is similar to the effect of the movie Battleship I've been working on it almost 3 weeks .but I can't achieve the effect exactly here is some screenshots of Battleship,could you give me some advice about the splash? thank you all.
  22. I'm looking to create as asset that will generate water droplets onto the surface of any input geometry. This would mostly be applicable to still shots. My first assumption would be to generate points from any mesh of a geometry and just use a copy node to place spheres on top of the outside mesh of the input geometry, however I want the droplets to look organic, like this: I don't expect anyone to write an entire tutorial here (unless it is actually quite easy), so if there's a tutorial already made hidden away somewhere I'd really love to be redirected. I'm intending to make a .hda out of it so I can use it in c4d.
  23. Hi all, I am looking to achieve the kind of effect in the given reference video below: https://vimeo.com/100104687 Check out the characters, they are made of grains and I am also looking for same/similar effect that can work with fluids. Thanks in advance for your help. Hope to hear from you soon. You can find the reference file here: Regards
  24. Hello, I am new to Houdini and learning. I have a task to do for a client, who requires water to flow along curve just like Realflow DSpline. I am using POP Curve Force to achieve the curve flow but not able to get the turbulent motion. I am trying to achieve something similar like the link below: https://vimeo.com/146377194 Thanks Poojan
  25. Flip Collision Issue

    Hello, i am having a hard time fixing this collision issue which i am facing in flip sim, Attached with this is the video to describe the issue. Two videos have been attached to show the difference, what i want and what iam getting now. I am not able to get complete collision with the water surface as only some particles are being driven off the surface. With the same file and settings earlier i was getting a good feel of drip but now it just won't consider the collision. I have tried literally everything like checking guide geo ,particle radius scale,substeps, collision methods but nothing helped till now. If someone could throw some light on this. PROB_01.mov Related_01.mov
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