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Found 365 results

  1. I'm working on a houdini pyro smoke scene and the problem is when I render it, the smoke comes out like it's boiling and also with layers ... I don't know why this happens... maybe because of the emitter or maybe render setting...? I couldn't find it on google as well... somebody help please
  2. I'm working on a houdini pyro smoke scene and the problem is when I render it, the smoke comes out like it's boiling and also with layers ... I don't know why this happens... maybe because of the emitter or maybe render setting...? I couldn't find it on google as well... somebody help please
  3. Hi I've been playing around with the wdas data set cloud and I've noticed that we houdini users (who are not lucky enough to have access to shaders dveloped by giant companies) lack an overall dense (almost pyroclastic) cloud shader that shows the distinct features of puffy cumulus clouds. After a through searching both in web and odforce i've seen that a few people also inquired on the same subject but it was inconclusive. I've decided to use this post as an idea dump to possibly implement a new shader or track your opinion on the subject. During the searching i've realized that distinct features of dense clouds are achievable by either using a very high number of internal light bounces or by faking them. I have seen that dark edges are the most prominent feature of the dense clouds since the other effects as transmittance and high forward scattering are already studied and implemented in shaders. To assess the current state of volume rendering other then mantra i've done a couple tests with several renderers in maya and also tried the new terragen 4.2. The most beautiful (simulating a real cloud light) is the hyperion render. Terragen 4 clouds are also very realistic and detailed (http://terragen4.com/first-look/). Arnold seems to be the best commercial option out there and is very good in giving the edge darkening but fails at details in dark areas (which is highly visible in hyperion) but i think these areas can be compansated with additional ligths. Redshift render is blazing fast but no where near the realism. In houdini i have used pbr with 50 volume limit, 5x5 samples, volume quality at 2 with a standart volume cloud shader. I have just started to see dark edges but even rendering a very small portion of 1920x1080 image took me about 10 minutes ( 2xE5-2680 v3, 48 cores total) . For speed comparison, redshift was the fastest with a couple minutes, arnold took about 10 minutes, terragen is said to be around an hour for a very heavy cumulus cloud. No information about hyperion but since wdas has a 50.000 core farm it shouldn't be a problem. Mantra was the worst with a projected couple hours of total render. Below are the sources i found for future reference for myself Oliver also asked about a cloud shader and Mike Lyndon says he has implemented a shader before (https://forums.odforce.net/topic/17900-cloud-shader/) . This is the most prominent one and is the one i will be implementing. The thesis of Antoine Bouthors that Mike says he has implemented (http://evasion.imag.fr/~Antoine.Bouthors/research/phd/thesis/thesis.pdf) . Beautiful mie scattering solution by Matt and the base for my shader (http://mattebb.com/weblog/rendering-clouds-with-the-mie-phase-function/) Odforce user Andrea was also interested in such topic and has some ideas in it (https://forums.odforce.net/topic/24831-cloud-shader/) Modelling aspect of clouds (https://forums.odforce.net/topic/12923-pyroclastic-noise-demystified/?page=2) Siggraph presentation by Magnus Wrenninge (http://magnuswrenninge.com/content/pubs/VolumetricMethodsInVisualEffects2010.pdf) Realtime clouds for horizon zero dawn by guerilla games. realtime but has really nice implementations (horizon zero dawn real time clouds) A hefty paper from Hyperion developer Yining Karl Li (https://blog.yiningkarlli.com/2017/07/spectral-and-decomposition-tracking.html) With the directions i gathered from Mike Lyndon's post i have started implementing the photon map approach. I have already implemented a henyey-greenstein phase function and added the contribution by radiance photons. Now i will try to implement the ideas presented in the thesis of Antoine, with high focus on cumulus cloud rendering (ch. 7). Attached is the current state of shader (cloud_shader.rar) I am also interested in GLSL implementations for viewport and cloud modelling tools but i guess this post wil be mostly about a shop type implementation. anyway here is a simple glsl implementation work and i am open to every feedback https://forums.odforce.net/topic/32197-glsl-pipeline-in-houdini/?tab=comments#comment-190945 I am definitely not an expert on this subject, so all input, ideas, criticsm, and source is welcomed. Thank you. Hyperion Render (wdas_cloud_hyperion_render.png is Copyright 2017 Disney Enterprises, Inc. and are licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License ) Terragen 4 Render terragen_4_render.tif Houdini Pbr Render (the little part on top took 10 minutes to render so i left it unfinished) Arnold Render Redshift Render
  4. Hi, probably very stupid question and basic, but can't figure it out by myself and internet... How to bring Material from "Material Palette" to a "Shop" ? I want to take "Principled Shader" and other shaders to Shop... Hope Its clear. Bretislav
  5. Houdini Lighting Artists - ETC LA

    Hey guys, we have a big need for Houdini Lighting artists here at Electric Theatre Collective LA. Any referrals are also welcome!
  6. When bake texture in houdini,it products some noise。I wanna to know the possible reasons。
  7. Hey folks! I'm working on a crowd scene. I set up an attribute to store unique RGB color for each generated agent. In the material builder I use bind parameter nose to incorporate the parameter. I set up the extra image plate too. It works properly with all other objects, but it doesn't work with crowd. I need the RGB color I need to control the RGB and also export it as a text file Cheers Szabolcs
  8. Houdini mantra shadow~

    i just need self shadow don't need the shadow on another object how to do it?~Thank you
  9. Hi, I hope I'm not asking a question with an obvious answer, please refer me to the relevant resource if there is one! I have a geometry which rests on a plane. After rendering with mantra, looking at the edges of the geometry which rests on top of the plane, these are looking strangely bright ( I've tried with different light sources, different samplings, etc...) I have recreated said issue with a basic box on top of a plane ( see attached images and hip file) The same issue still occurs if I move the box down, and make it intersect with the plane. If any relevant, this is with Houdini Indie 16.5.496, on Mac OS High Sierra 10.13.5 Am I missing anything obvious? Thanks in advance for any suggestion you guys might have! close_up_Active_Render.0001.0.exr higher_point_Active_Render.0001.0.exr funky_bright_edges.hiplc
  10. Hi, I tried to render this simple thing, but I can see only black on the render view. What am I missing something?? Thanks! tryTT.hip
  11. Flipbook Tool?

    Hello hive mind! I'm looking for a better solution to saving out my flipbooks as .mp4s. Right now I have ffmpeg installed so I can go directly from mplay and save an .mp4, but I cannot figure out how to change the preset for the menu so that the default file name matches my naming convention. Which is really annoying. I'm looking for any of these solutions! 1) Does anyone know how to update this ffmpeg window with a custom string in the "Output File" field? 2) Does anyone know where mplay stores the tmp images, so I could grab them straight from there and go to ffmpeg from a shell? 3) Does anyone have a better solution for flipbooking? Thanks!
  12. Hey guys, I am having trouble converting a SHOP setup to the MAT network. I am sampling colours from a cached point cloud to change the surface colour and it works as expected in the SHOP network if I promote the pcopen file and pick a sequence. But it doesn't work in the MAT network, if I leave it as a flat network there is no where to promote to and I get the "time dependent warning" and putting the setup in a subnet and promote that still doesn't work. I either get the first frame of the cache sampled or nothing at all. Is it because the MAT network is just a massive VOP? And is there another workaround? thanks, Z
  13. Hi Folks! I'm quite desperate trying to bake AO. My Scene consists of a grid and the rubber toy. I want to have the AO on the grid. Could anybody give me a hand with the steps involved or point me in the right direction. I'm a noob trying to get a hang of it. much obliged
  14. Hi guys, I am currently building a environment for which I want to instance a lot of mega scan rocks. I am using the instance object so that I can instance thousands of the rocks with a huge hit. The problem is now that I turn on the displacement on the rocks everything comes to a halt. It looks like mantra is placing all the objects and then dicing and displacing the geometry. Is there a way of dicing and displacing the geo first? Should I just bake the displacement into the geo?
  15. Houdini to WebGL

    Hello everyone, For the past 2 years, I've been learning Houdini with the hope of transitioning from working fulltime as a HTML5 developer, into a 3D interactive visualiser. I'm using Houdini to further my understanding of 3D, realtime, VFX, AR, VR and machine learning. It is an amazing experience learning the software. This is a video showing the creation of a mech: https://vimeo.com/258470468 I then derived a realtime model from the high resolution version to create a 3D web presentation with options to alter the environment lighting, material and accessory: https://playcanv.as/p/zBVh4yEF Any feedback from the Houdini community would be amazing! Thanks, David.
  16. Speed up Mantra IPR

    Is there a way to stop Mantra from regenerating Scene ? at the moment I am working on some Shader and Texture work and and have only a Plane and a basic light and everytime I drop a node on to the IPR it regenerates the scene and makes my work for parameter changes very slow...
  17. Hi, I want to render a custom pass for clouds in mantra. The reference jpg shows a custom pass from Maya (density / ambient) and the alpha for the same clouds. In Maya a gradient ramp was used on the incandescence channel. Basically where the clouds are denser should be black and the opposite, for lower density I should have white. Can I replicate that with mantra? I'm using the sky rig tool so everything is calculated at render time. Thank you!
  18. REDSHIFT AOV EMPTY

    if I render with redshift my aov are always empty, whether zdepth, gi, diffuse raw....
  19. Hi everyone, I'm trying to render a scene where my lights change colour/intensity between frames. I was hoping to see these colour changes in the motion blur but when I try and render it the light just stays a constant colour/intensity even though I can see it changing when I scrub through in the viewport. Has anyone else managed to get something like this working before in mantra? I've set up a simple test scene here with one light animating around and changing colour & intensity. Cheers! MotionBlur.hiplc
  20. Showreel 2018 Tom Freitag

    Hello, I am FX/CG generalist. Here you can watch my new showreel compiling some work for feature film, commercials, personal work and R & D. I am available for freelancing remote or berlin based studios. Breakdown: https://www.dropbox.com/s/94tmwcmkmk279c2/breakdown_reel_2018_tomfreiag.pdf?dl=0
  21. Hi all, First time poster, very new Houdini learner. Attempted to render a FLIP fluid simulation in Mantra, rendered to disk. Changed the file save type from .exr to .pic as I had read that this removes the watermark for Apprentice users. The render took 4 hours, however the resulting file output is a single .picnc file of 2017kb. Having looked over the Mantra parameters (screenshots attached of what I thought might be relevant information) I can't see anything that might explain why this happened. If anyone has any suggestions they would be greatly appreciated! Thanks in advance for your time & advice.
  22. Why is the roundededge node so buggy? I want to use the node as alpha in a layermix node. When i do so, i always get a message the my pc is running out of memory (i have 128gb ram). Somebody any solutions? kind regards
  23. MultiColored Material

    Hi, Would anyone know good tutorial on how to make multicolored materials like this? It tried it with color mixer note and cell noice pattern , but i doesnt give me a good result , also is there a way to expand the color mixer note to use more than 2 colors? Thanks
  24. Hello! I'm trying to render a flip simulation and I'm getting a lot of flickering. They're all caused by my direct lighting, but decreasing the intensity still doesn't fix it. I've tried to change the sample rate and the rendering limits but I can't find a problem to fix the issue (noise is not a problem but the white reflections). I attached an image with the result. Thank you in advance!
  25. Deform Bend Camera Ray?

    Is there a way to bend the I-ray over distance when rendering? Trying to do something similar to Interstellar space bending scenes. So far I got it partially working with multiple frustrum planes in front of the camera (at different distances). Those carry a shader which continues the I-ray in an offset direction (using raytrace). This seems pretty slow. So I was wondering if there is any other way to do something like that? Was thinking of using a volume / volume shader for that, but that might get a bit excessive ...
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