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Found 119 results

  1. Hello node friends ! I have a problem in hands here. Basically I'm doing a stadium crowd sim. So far so good. I'm then doing the shading over on the material style sheet and rendering with mantra. I also have a cloth sim with the same proprieties over on that style sheet. The problem I have here is the following: I can render the flags over on the farm with the IFD generation, I've included the SHOPs on the mantra ROP. That part is solved. When it comes to rendering the Crowd, it just renders black. I've tried caching out the results, using procedural geometries and the procedural agent SHOP but it still renders black. I can render it just fine on my machine, when it comes to the IFD rendering part, the machines can't render it. Notice that I have all the agent caches and maps over on a shared network drive that it can access, otherwise the cloth wouldn't be able to render it either. Any ideas?
  2. How to get smoothed UVs at seams in new Subdivide SOP? It was possible in Houdini 16.0...
  3. How can I render animated trail like these from my simulation? Be able to add material to these and do other stuff too if possible. Thank you so much for your help. I succeeded to see these trails in my Dop Import but it shows nothing in renderer (example pic from internet) http://www.sidefx.com/docs/houdini/images/visualizers/volume_trails.png Thank you so so much
  4. Flipbook every other Frame??

    Hello, I was wondering if anyone knew how to flipbook every other frame or every three/four/five frames etc? And if this isn't possible which I'm not sure if it is, how would you go about doing this with a render too? [ without manually flipbooking or rendering every other frame etc. ]
  5. I'm trying to provide an option to render to background so my artists can continue working on their shots Houdini. Currently in my OTL I am calling hou.hipFile.save() then proceed to trigger the render in background option in my mantra rop. hou.node(node.path()+'/render/render').parm('executebackground').pressButton() Despite saving the file, when the render executes, I receive an error telling me to save the file. Is there a better way to approach this?
  6. Hello, I have encountered strange difference in render outputs from different computers and I have hard time figuring out what might cause this to happen. I have created scene on my laptop and then tried to render it on workstation. Both computers have the same Houdini version installed (16.0.736) but they produce different results when rendering. I am attaching both renders - first one rendered on laptop and second on workstation. On second picture, there is strange noise and highlight around area in the middle (exactly where the point light is located inside cloud). I was rendering the same scene and I expected the result to be the same as on my laptop. The main difference is that my laptop is running on Linux while workstation is running on Windows. Also there are different CPUs in these two computers (laptop - xeon; workstation - i7), but I guess that should not make any difference. Please, does anyone know what might cause this difference in renders? Thank you very much. Best regards Trandzik cloud_test_01.mantra1.0001.exr cloud_test_01.mantra2.0001.exr cloud_test_01.hiplc
  7. Hey, When you use the render button in the toolbox, then click view:Mantra, what render node is it using? It definitely isn't using my render node. It renders from the perspective view as expected but its at some weird resolution and not my render node's settings. It renders at 640 x 465, lol. What node is it using and how do i edit it?
  8. Render Wrangler needed - TRIXTER Munich

    TRIXTER is currently looking for a Render Wrangler. Description: The After Hours Render Wrangler & IT Support position is a part-time but mission critical role to offer both after hours IT support and assist in the effective use of the computing resources (renderfarm) utilized in rendering computer generated images for our active projects. To start as soon as possible. Long-term contract. Primary Responsibilities: - Monitor, manage and keep the renderfarm running at maximum capacity - Monitor jobs on the “Pixar Tractor” render manager: identify stalling jobs, follow up and report failed jobs to artists/Production. - Check and re-start failed render tasks. - Update and maintain Render Manager job priorities according to instructions from Production. - Monitor disk space usage and flag high disk or network usage over-night. - Restart unreliable blades and report them to the IT as necessary for later diagnosis. - Provide first level technical support to artists and production team members working after - Provide additional information to, and where required, liaise with the IT team to assist in trouble-shooting larger technical issues. Required Skills & Experience: - A focus in Computer Science/Engineering as an undergraduate is a major plus. - Experience with Linux/UNIX, in particular the shell environment and navigating through the file system is a requirement. - Experience and/or interests in any of thefollowing IT technologies is a benefit: ZFS, Layer 2 Networking, esxi, vsphere, pfsense, RHEL, iSCSI, git, rpm, Bacula, NFS, SMB, python, Asterisk, Ansible, Graphite, Nagios, Observium, Cacti, Solaris, bash, csh. - Excellent communication skills, both verbal and written - Good organizational skills and attention to detail - Ability to handle a fast paced, occasionally high pressure environment - Ability to work well both independently and as part of a team - Willingness to work very flexible hours, including weekends and/or evenings. Please send your CV and your earliest commencement date by email to Laila.sleiman@trixter.de and/or jobs@trixter.de We are very much looking forward to meeting you! www.trixter.de
  9. Render depth layer but force matte object in the depth layer.
  10. Render ROPs in background

    Hello! I have a question concerning ROPs, because I can't seem to figure out how to render them "in the background" as you can do with other write-to-disk SOP-nodes or Mantra-render-nodes. I really like this options as it gives me the ability to still work in the same scene without having to open another window. My particular case is that I have a flip sim and want to render two caches out at the same time (one fluid cache, one surface), frame-by-frame dependent on each other. If, as I expect, you say that there is no way to do this, because of the dependencies, then I'm fine with that. I just wanted to ask if I missed some usual Houdini-black-magic. Thanks!
  11. Hi Can someone shed some light on how to render a velocity pass, from a flip fluid vdb mesh, for compositing? Here's a reference videos:
  12. Hello friends, I was using Arnold for a long time while also playing with Mantra, but until now I never really had a time to dive deep to Mantra. The thing I really adore about Arnold is that in its settings it has this beatiful "Samples calculator". It seems just like a small detail but in my personal experience it was a great help for optimizing heavy renders. So few weeks ago I decided that I would try to create some similar calculator for Mantra. At first I implemented it by Arnold example which works like this (I'm not 100% sure with the equations but in my tests they work ): Camera (AA) Samples = pow(Camera (AA) samples parameter, 2) Diffuse Samples (Min) = pow(Camera (AA) samples parameter, 2) * pow(Diffuse samples parameter, 2) Diffuse Samples (Max) = pow(Camera (AA) samples parameter, 2) * pow(Diffuse samples parameter, 2) + (Diffuse depth parameter - 1) * pow(Camera (AA) samples parameter, 2) Specular Samples (Min) = pow(Camera (AA) samples parameter, 2) * pow(Specular samples parameter, 2) Specular Samples (Max) = pow(Camera (AA) samples parameter, 2) * pow(Specular samples parameter, 2) + (Specular depth parameter - 1) * pow(Camera (AA) samples parameter, 2) Transmission Samples (Min) = pow(Camera (AA) samples parameter, 2) * pow(Transmission samples parameter, 2) Transmission Samples (Max) = pow(Camera (AA) samples parameter, 2) * pow(Transmission samples parameter, 2) + (Transmission depth parameter - 1) * pow(Camera (AA) samples parameter, 2) Total (No lights) Samples (Min) = Sum of all min samples above Total (No lights) Samples (Max) = Sum of all max samples above But soon I realized that Mantra does not work this way. (Well yes, it was silly to think it works the same way ). So after reading a lot about how sampling works in Mantra and talking to my friends I came up with this calculator: ray_count_calculator.hdanc Which counts ray count like this: Camera Samples (Min) = clamp(Pixel samples X parameter, 1, ∞) * clamp(Pixel samples Y parameter, 1, ∞) Camera Samples (Max) = clamp(Pixel samples X parameter, 1, ∞) * clamp(Pixel samples Y parameter, 1, ∞) Diffuse Samples (Min) = clamp(Pixel samples X parameter, 1, ∞) * clamp(Pixel samples Y parameter, 1, ∞) * Diffuse samples parameter * Global multiplier parameter * Min ray samples parameter Diffuse Samples (Max) = clamp(Pixel samples X parameter, 1, ∞) * clamp(Pixel samples Y parameter, 1, ∞) * Diffuse samples parameter * Global multiplier parameter * Max ray samples parameter Reflection Samples (Min) = clamp(Pixel samples X parameter, 1, ∞) * clamp(Pixel samples Y parameter, 1, ∞) * Reflection samples parameter * Global multiplier parameter * Min ray samples parameter Reflection Samples (Max) = clamp(Pixel samples X parameter, 1, ∞) * clamp(Pixel samples Y parameter, 1, ∞) * Reflection samples parameter * Global multiplier parameter * Max ray samples parameter Refraction Samples (Min) = clamp(Pixel samples X parameter, 1, ∞) * clamp(Pixel samples Y parameter, 1, ∞) * Refraction samples parameter * Global multiplier parameter * Min ray samples parameter Refraction Samples (Max) = clamp(Pixel samples X parameter, 1, ∞) * clamp(Pixel samples Y parameter, 1, ∞) * Refraction samples parameter * Global multiplier parameter * Max ray samples parameter Total (No lights) Samples (Min) = Sum of all min samples above Total (No lights) Samples (Max) = Sum of all max samples above While using premise that these parameters in Arnold and Mantra influence the same things: Arnold Camera Samples = Mantra Pixel Samples Arnold Diffuse Samples = Mantra Diffuse Quality Arnold Specular Samples = Mantra Reflection Quality Arnold Transmission Samples = Mantra Refraction Quality Arnold SSS Samples = Mantra SSS Quality But there is a catch: In Arnold if you set Diffuse Samples to 0 you will get black diffuse indirect pass In Arnold if you set Specular Samples to 0 you will get black specular indirect pass In Mantra if you set Diffuse Quality to 0 you still get samples in diffuse indirect pass In Mantra if you set Reflection Quality to 0 you still get samples in reflection indirect pass So I think we can be sure that Mantra pixel samples fire also diff/refl/refr/sss samples - so when having diff/refl/refr/sss parameters set to 0, their corresponding rays cant be 0 (but I really don't know and can't find out how much of them is fired) Also pay attention to the clamping of pixel samples - in my tests pixel samples parameters were always clamped like this: clamp(Pixel samples parameter, 1, ∞) - when using values lower than 1 the result was always the same as when using 1 This catch made my calculator useless It seems that Mantra fires all kinds of rays even when using pixel samples only while Arnold does not. I personally did not expect this behavior and as far as I know it is even not documented. (Or at least I could not find it). I spent few days trying to figure out how these parameters could relate to each other but I did not find any good solution. So in my frustration I decided that it would be probably better to ask you guys if you did not try to create some calculator like this before or to find out how all Mantra parameters relate to each other I think it would be a great help for all Mantra users to find out how Mantra works "under the hood" Thank you very much for any advice and have a nice day.
  13. Hi all, I want to import a particle simulation from houdini to Maya without using the Houdini engine and render in Redshift. I made a way around it stamping spheres into particles and exporting them as Alembic, but the file is too damn heavy. Do you have any suggestion? Thanks in advance.
  14. Hi, I am pretty new to Houdini and I've got a noob question: how can I only render the light and shadow on the ground without the ground? Thanks a lot, Máté
  15. Hi, We are having issues with tiled renders not writing out the images planes that are present in scene. Doing a local render or non-tiled submission with Afanasy works as expected. Looking at the tile renders generatedby the job before the stitch, it appears that whilst there is a separate .exrfile written out for every tile named "filename.exr.tile_1.exr" for example for tile #1, this contains no image plane information. We also have a file namedsimply "filename.exr" which does have embedded image planes but seems to be being written to by each node that is rendering a tile, simultaneously and is always unreadable. Is this correct behaviour and does Afanasy actually support tiled rendering with image planes in Houdini? I would have thought that each separate tile .exr would contain all of the required image planes for the stitched image. If you can shed any light on what we may be doing incorrectly that would be appreciated. thanks Tom
  16. Mantra render trouble

    Look at my render here... Notice I have these funny effects where some render buckets appear to not have finished rendering. I have pasted in my mantra settings to the right top and bottom. What is causing these render anomalies?
  17. I need to reduce render time for volume so, I tried to use make ifd format. then, how can I render this IFD? the only thing I can is just to click render to MPlay. I wanna render to disk.
  18. Hey, I am rendering to disk a 400 frame ocean simulation. The ocean mesh and foam particles are cached out. I hit render to disk, and it will randomly stop rendering. No error. It even still has render dialog up. However, the file size on frame it is "rendering" currently doesn't change and there is no mantra checkpoint. It just stays sits and does nothing. I have to keep starting the job again and again. Once I start it again it keeps rendering till it randomly stops. What could cause that? This has happened to me before on other simulations. Thanks.
  19. Spark + hip file

    Download : https://www.dropbox.com/s/amy4f2smp8qt2m4/Spark - H16.rar?dl=0
  20. Does mantra do not have a motion vector pass? If so how to render it? Every explanation I found on internet is quite old from 2009 I can only hope there are new methods to do this, right? Any help will be appreciated.
  21. Strange pixelation in Fire

    Hey all, I'm getting some strange pixelation issues in my fire render. I was playing with various settings all night yesterday. I'd love to get past this part and start working on the look of it. Has anyone ran into something like this before? To give you an idea of scale, the model is 25cm. I would attach a .hip file but I'm using a bgeo cache for some elements, including the fluid source. Thanks for any help in advance
  22. Hi I have to work on and animated piece of cloth where the individual square pieces are docking into the animation. How would you go about the rendering? I got an attribute that separates bright pieces from the dark ones. Can call that attribute into the shader but need more variation. Would you use a for each loop to iterate over each piece in order to apply e.g. individual uvs for each piece? The material should be very sparkly on some parts.
  23. Hey,I am new to ocean simulations in houdini. I have a beach tank that I would like to render only the foam. The reason why is we are rendering everything else in Maya, including the water mesh. Does anyone know of of a tutorial or can anyone point in the right direction to rendering a “white water pass” correctly so it can be composited on the water render? Thanks
  24. Hi guys I'm making explosion fx with box, (like lego movie) and how do you put explosion color on box?? I tried to get density, heat or temperature attribute and multiply ramp param but I think it doesn't work or I did wrong way. If you have any ideas please help me thank you CubeEXP.hip
  25. Hello everyone, I have recently wrote an inhouse python plug-in in c++ for houdini. H2A is a custom plug-in to export houdini geometry in arnold ass file format to be able to load in mtoa, htoa or c4dtoa. This plug-in exports almost every geometry type to arnold i.e. points, polygons and curves. You can compile or grab the compiled plug-in from: https://github.com/sergeneren/anima/tree/master/anima/render/arnold/H2A P.s. please excuse my sloppy c style
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