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Found 323 results

  1. Pyro Disturbance for high vel

    Hello, How to increase the disturbance on high velocity source, Im using particles and volume as sources, both with very high velocity, but disturbance only affect after some frames, not on initial simulation frames, I`m using 3 "gas disturbance" microsolvers, 2 controling density fields and 1 controling the velocity.
  2. Houdini Pyro OpenCL Error

    Getting an error when trying to run a pyro sim with openCL: "gasturbulence1: Error: compute_turbulence_cl: Error: smokeobject1 - /obj/geo1/dopnet1/pyrosolver1/gasturbulence1/compute_turbulence_cl: Fields must be matching for OpenCL " Any ideas?
  3. collision of 2 smoke objets

    Hi everyone ! Do you know how to make collide 2 pyro objects, for example one pyro going in +y direction and the other going in the -y direction and pouuff ! In the pyro solver node you can define buoyancy direction but how to define 2 different directions ? multi solver ? Thanks !
  4. I am trying to recreate this effect, and I can't find any info on how this techniques were implemented… Any help ? Thanks, Diogo
  5. apply gas turbulence based on velocity

    hey! I'm trying to apply gas turbulence based on the velocity of my volume, what I want is turbulence only where the volume has some velocity, but I can't make it work although it seems pretty straightforward (see image attached)
  6. Pyro Cluster not working

    Hi guys. That is my first post =] I'm trying to create a cluster pyro, but I don't know why it's colliding with the boundary instead of continuing going forward to the next cluster The bounds are opened, the clusters are continuous been created as I expected, but the pyro are not doing what it should be doing.. lol I've created the cluster from scratch. But I already tried to use the setup from the shelf tool and it didn't work as well... I really don't know what to do anymore. It would be awesome if someone could help me Thanks!!!!! Cheers I sending the hip file so u can take a look RBD_Explosion_v1_t3.hipnc
  7. Hi, I just want to do it for experimentation. What's the best way to break up the edges of a pyro sim post sim with or without rest fields, and avoid swimming noise? If I have dual rest fields, do you combine them using a Mix node where the connections are rest, rest2 fields and rest2_ratio as the bias? Because there is also rest_ratio attribute. After this, do you displace the density volume using velocity field, gradient of the density or gradient of the SDF converted from density? Also negate the direction? I read here some people advising to use gradient or velocity to the position of the noise for example. Lastly which noise is more suitable for this task? Thanks a lot
  8. leaf burning

    Hello everyone! Any useful advice on how would it be possible to recreate this effect? Thanks Isy
  9. Pyro Resolution Fix

    Hi, I have setup a pyro, its resolution seems nice and crisp but as the bounding box expands the resolution seems to fall down and everything looks voxelized. How to setup the pyro in such a way that it maintains a certain resolution according to the size of the bounding box. I have attached a link of the pyro video, you can clearly see the fire becoming lowres as the boundingbox expands. Please let me know how to fix it.
  10. Gasoline flame

    Hi everyone, I would like to make a flame like the référence. It seems to be a flame from gasoline. The base of the flame look like it's transparent. I did a basic setup using noise on the fuel attribute and trying to get the transparency from the shader but it's not going so well. Is anoyone has done this type of flame before ? Thanks
  11. Hello guys! I have set up a pyro sim with instancing to have 7 slightly different fires. Now I am trying to figure out how to stop emitting from a selected instance point, for example having pyro_2 and pyro_5 to stop emitting at frame 24. I would really appreciate if anyone knew a good way to do this. Thanks! pyroCluster_controlled.hiplc
  12. pyro cache issue

    Hello, I'm probably doing something really dumb, but I'm unable to get my smoke simulation to show in the viewport without being inside of the dopnet. (I'm still pretty new to these complicated simulations.) I've tried visualizing and also caching many different ways, also tried converting my caches as well. My simulation also doesn't show up when turning off/on the visibility of my geometry node. I've cached under the Pyro preset from dop I/O, imported right back in, nothing. Show all objects is on... There's no lighting enabled in the viewport... I've updated the scene view pane... Saved and opened up the file again... I really just don't know. I have density, I have temperature, I should be able to see it. Using 16.5 - I appreciate any kind of help, thank you.
  13. Animated Pyro to world origin

    Hey there, just a quick little question: how can I transform a pyro sim that is been done on animated geometry to 0, 0, 0 in world space so it sticks there without jiggling? Thinks like - centroid or -$CEX etx obviously dont work, because the center varies due to the changing shape. What I want to achieve: the sim takes place on an animation and this anim changed. So I want this sim to stick on the same spot of the the new anim. Any hint? Cheers
  14. Houdini Pyro Collision

    Hi there everyone. This must be a common question but I just cannot seem to get the Pyro Collisions to work correctly there is defiantly something I am missing and I would greatly appreciate some assistance. So this is the issue I am having. Below you can see the Multi Field going through the Collision Field where there are no holes. This is the Multi Field. Here is the Collision Field on its own so you can see its a solid Piece. This is the Temperature Field. This is another angle of the actual Geo at the same frame as the images Above. So I just wanted to mention what I have observed and what I have tried. first my observations, the Multi filed is only partly interacting with the collision field, in that some of the smoke travels along the ceiling of the roof before finding an exit and pushing outwards. Secondly have I have tried, Is using the Houdini shelf Deforming collision object but it only dose 2 frames then hits my 32gb memory cap and my system crashes and restarts. This is if the mode in the Static Object is set to Volume Sample. If I try Ray Intersection it dose not work, there are holes in the collision Field. so the method I am Trying to get right (Based on the Images above) is the secondary Volume Source set to collision. Here are my VDBs and I am merging in the Cached RBD Data. And this is my Volume Source for that VDB Surface If you need anything Please Let me know ! Have a Great day, Jody.
  15. pyro explosion using grain

    hi, am working on an explosion shot (desert explosion). i have seen some grain adverted pyro examples . can anybody give some tips doing it ?
  16. Hi, I want to emit fire from a geo and use a texture mapped on that geo to control the fire emission. I know there is a way to scatter particles on a geo and then use a texture mapped on that geo to control those particles scale and then use them to emit fuel, but I would like to know if there is a way to directly use a texture on a geo emitting fire to control the fuel amount so when there is a gradient in the texture, the fire really fade correctly instead of just being emited by smaller particles in the grey areas... also I don't like the idea to have to use a really dense mesh to have enough rez for the texture to show in the scattered particles when there are finer details in the texture (or maybe Houdini is so powerful that it doesn't bother to do this...) In the doc about the "attribute from map" node, we can read this: http://www.sidefx.com/docs/houdini/nodes/sop/attribfrommap.html You can use this node to create density, fuel, and temperature data to drive a fluid simulation. Using the Fluid Source operator, this data can become a set of volumes to be used as a source for a fluid simulation. So by "fuel data" do they mean scattered particles as emiter? Or is there a way to use that node to directly control the fuel by a texture? tanks in advance for any hint folks!
  17. Rolling Clouds Simulation Using Smoke

    Hey there, I recently saw a breakdown that Main Road Post did at last year's SIGGRAPH and I have been trying to recreate their cloud simulation but to no avail. Currently I'm using particle velocity to drive the smoke velocity in hopes of generating shapes similar to their video which I've attached here as a reference along with my scenefile. I'm hoping someone could take a look and maybe give me some pointers. I would love to get close to what their reference is. I really love how they achieved a rolling cloud look. Thank you. cloudSim.mp4 clouds_v03.hip
  18. Anyone know how you can make a custom container shape? An example
  19. Hi Does anyone know good tutorials for learning Explosions? Thx in Regards Balaji J
  20. Hi magicians, I was trying to create render passes for the fire, I want my temperature and fuel to be render as different render passes, I tried to use temperature and fuel as float in extra render images, but the problem is that, I am not been able to get it properly. what is the way to get render passes for temperature, fuel and heat in extra image details ? I would also like to know the way to render normal passes and any other passes which can be rendered out from volume, like opacity pass or something helpful in compositing. I get the fire mask from the shader but it is not that useful. Thank you.
  21. Pyro to Maya

    Hey magicians, What's the best pipeline to export pyro to maya? I'm working at houdini scale and I think maya scene is x1000 so I'm worried that the smoke probably will look bad. Any tips will be really appreciated Thanks!
  22. RENDER COLORED SMOKE

    Hi Everyone I am new to Houdini. I study three methods to make colored smoke. I can simulate color particles from all of methods but I can not render out colored smoke. As for method 3, more frustrated on the pcopen of material builder. I can not write out particles at all, there is no smoke to render out neither. I really need some help to know how to render colored smoke or pyro after simulation. sorry can't upload file so only use youtube to point out my questions. 1. Method 1: https://www.youtube.com/watch?v=sTObU9iYmmM I only can render grey smoke but can not render colored smoke at 9:18 of video No idea why? 2. Method 2: https://www.youtube.com/watch?v=FudW5RpFw9s&t=60s I set up a material pyro shader to render. I only can render grey smoke again not colored smoke. No idea why? 3. Method 3: https://www.youtube.com/watch?v=A_0emoJjWc0 I follow up video to make the path for point cloud texture, but can’t write out anything after rendering at 30:27 of video. No any smoke at this time. Hope guy can give a help to solve the above issue. No idea where I missing. Thanks in advance Ben
  23. Ground / Terrain Collapse Effect

    Hello all, I am looking at this amazing fx made by Axis for Halo e3 2013. Studying the reference ( the terrain fx ), I thought to approach this using RBD fracture to drive a second sim layer of pop grains (sand). However, I am also thinking maybe I could use vdb+volume vops to mimic the motion. and for the second layer, perhaps using just particles emitting in focus areas. I would appreciate your thoughts on how to approach this. GroundCollapse_Reference.mp4 @MENOZ would love your input if possible.
  24. Hey magicians, I've got a particle setup burst wich generates a pyro sim I know how to advect particles from pyro when we have ie: the same emitter (sphere) but in this case my main emitter is this particle system: So what I tried to do to have the base geo emitter match with the pyro shape is: 1) copy spheres on the particle emitter - 2) create a vdb from the pyro and use as source Both methods don't get me that pyro shape in motion with the particles, any suggestions? Thanks!
  25. Hello im a student and pretty new to houdini working on a personal project can u please help me figure out how this effect has been made since im still learning & cant afford high end simulations i would be really grateful if someone could give me an in detail explanation of how to do this... its pretty urgent since i need to finish the project in the next 15 days.. Thank you guys in advance
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