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Found 250 results

  1. Recent work from Chinese animated feature 哪吒 (NeZha), I was responsible for creating and rendering of the water effects using Houdini flip to build a guided system for water and render in Mantra, final compositing done in Nuke.
  2. I have a switch with some inputs. Swtich input is linked to $F to loop through. For all of the inputs I created a detail attribute "type" e.g. "sphere" / "torus" / "box". The null node reads the detail attribute and writes the value in its parameter. I want to setup the rendering in a way that it will skip the render if the null node detects that I am rendering a "box". I thought of doing that with a pre frame script that checks the parameter of the null node if its == "box" and then skip the render. What would be the best way to skip the render here? Is there a hscript or python expression for that? Jon skipFramesByAttributeValue.hip
  3. Hello; In Mantra, is it possible to render a region, in sequence? Thanks.
  4. Hi; I would like to render smoke with motion blur, so I turned on "Geometry Motion Blur" option on "pyro_import" geometry, but it doesn't work. Any idea? Thanks.
  5. Render deep data with Mantra

    Hey guys, I was wondering if it is possible to export exr images with deep data information in them. It would be to use those in Nuke later for Deep Compositing. Also, I would like to know what is the difference between exporting a fully textured model from an explosion or a fire. Cheers! Trapo.
  6. Howdy, I'm running into memory issues when baking textures (using the Bake Texture mantra node). Right now I'm unable to bake 2048x2048 textures on a machine with 32GB of RAM at a 16x16 sample rate, which doesn't seem right. I'm seeing two different bad behaviors: 1. It starts rendering and the RAM usage just builds up and up until eventually it crashes. 2. It renders until the RAM usage is basically maxed out, then the CPU usage goes down to 3%, and the render never finishes. I'm not sure why it's not flushing any of the RAM as the render goes on? More details: I'm not rendering any extra image planes. I've tried png, exr and rat file outputs. I've tried setting a Cache Limit using both memory ratio & fixed size, but neither seemed to do anything. Running on Windows 10. Houdini 16.0.557 Looking for ideas for how I can fix this. Hoping there's something stupid I forgot.
  7. Hey everyone, Whenever I go to the render viewport in Houdini 17.0.352 I get the following message "Error : failed to save output to file "traceback (most recent call last):" I joined here both the error message I get when I start Houdini and the Message I get when trying to render using mantra. BUG report.pdf Trying to render a frame manually (save to jpeg) also leads to an error. I tried reinstalling Houdini or even deleting preferences but none of this worked. I believe this is a bug linked to Python, but can't figure out what exactly. -- Could you guys please help me with this situation ?
  8. Efficient point rendering

    I'm rendering a big point cloud from a BGEO file. The only thing that changes is the camera animation. If I use the interactive renderer then the scene updates super quick and renders at about 10-20 secs a frame. If I render using a mantra ROP it takes about a 60-70 seconds. I'm assuming it reloads the geometry every frame (or something!?). Is there a way to get something like the interactive render speeds in Mantra? I've tried using delayed load and disk primitives and also various renderers in Mantra (e.g. micropoly, physical) without much success. There is no lighting or any other vex or vops or anything going on. Simple constant shader. Thanks Simon
  9. Hi all, I'm rendering some jellies, in water, in a glass tank. Any pointers as to how to optimise this? My render times are huge. Using mantra.
  10. SlimeFX

  11. Hi there everyone. I am having a really strange issue with my river scene when I render it out. The reflective of the water seems to turn on and off randomly. I then did some further testing and found it to be the interior Volume giving me issues but this only happens in the center section of my River, the Top and bottom are not affected by this problem. Below I have two Images to show the result of the Volume issue which is consistante on these two Frames even if I re-cache the Sim Frame 350, the Volume in the center is really Thin. Frame 357, the volume is much Thicker in the center. Please check out the Link HERE for a low quality render with a few frames on Vimeo. Password : JodysFX I feel like there is a setting I am not turning on or a value thats two low. It might be in the Surfacing node but I am not sure, I will continue to test. Any help is greatly appreciated.
  12. Hello, after a small nightmare with switching to new whitewater system I'm a bit stuck with rendering an ocean shot: I would like to see a structure in water dissapear slowly into the abyss. Because Mantra is quite slow I don't want to use the volumes or a uniform volume shader for that (which is recommended). Absorption/Attenuation would be ok I think but it's missing from the Ocean Surface material! It's mentioned in the manual... What's going on? Any ideas how to switch it on? Screenshots, maybe I'm not looking at this correctly: Extra question - any ideas why Mist shelf tool was removed? We're supposed to build our onw on Pyro, right?
  13. I am trying to use the color visualizer to colorize a topographic map, it is all working perfectly in the scene view, however, the render in Mantra is not picking up those colors and the render is only a single base color. Anyone could help how this can be done? Appreciated Khal
  14. Mantra UV Pass

    Is there a way to add a uv aov in a shader ? I've tried to bind uv to an output ut uv pass is black ? Any idea ? Thx untitled2.hipnc
  15. Hello guys! Can I ask U question, Im very new in houdini. Can u help me please? Im trying to render short video of volume (smoke) in matra, but I really do not know how to set the mantra settings, because one frame is mantra creating for 43 minutes, which is rediculously long time for 250 frames. can U help me, with settings? I already increased the Volume step size, but thats all what I did, (I read somewhere its helpfull) is there any other way, how to make render time (per frame) shorter? Thanks a lot for any advices! Im looking forward to your re´s! By! advice.hip
  16. Houdini Rendering Issue

    Hello, I am needing advice/solutions in regards to my current pyro render in H17. I am doing a volcano plume with some billow smoke, I have a pyro shader sourced into a OBJ merge for my Mantra. I also have a directional light and an environment light that has a 2k IBL. The sampling on my environment light is at 10 and also my mantra pixel samples are at 12x12 and I seem to not be able to get rid of this flickering happening with my environment light. I have looked all all sorts of setting and such changed my HDR to a .rat yet it still doesn't see to remove this flicker. My camera is set at 1080 and is doing a slow pan over 300 frames. Would anyone be able to advise what this may be? Thanks, K
  17. Hi everyone, so currently I am stuggling with wedges in Houdini 17.0. The current setup is the following: My intention is to run a wedge on a pyroSim, cache it out with the Geometry ROP (which works), and then with each one of the cached wedge sequences render out a sequence of .exr with the Mantra ROP. In whichever way I connect them though, I can't seem to find a way for it to work - it only does with the geo caches. I hope any of you could lighten me up a bit on the matter. Thanks!
  18. Hi houdinist ! I am trying to apply saturn ring texture in mantra but I failed to reproduce the texture mapping in attachement (done in blender), someone could help ? I tried to rotate UV by an angle of 90° over each face, but I don't know how to achieve this hip file in attachment with saturn ring texture thanks Alex ring.hipnc
  19. Hey guys, Im rendering a pyro sim around 1-3 mil voxels, im using an environment light and a volume light emitting from the pyroshader. Rendering using PBR with pixel samples 3x3, volume limit 1, noise level, 0.1, volume quality 0.1, volume shadow quality 0.5 and stochastic 8 im not even using motion blur, but one frame is almost taking 1.5 hours. Any ideas how to increase the performance, am i doing some nonos that i missed? the smoke is fairly transparent and the light from the fire is strong.
  20. [I think I'm probably more than a few days from understanding and being able to write the necessary recursive function, but I thought I'd tap the brains here to save time (or see if I'm on the wrong track and it's easier than I assume).] I want to build a list of render nodes that include the nodes they depend on. (see image) Something like: (node name, nodes it immediately depends on) (r,as & b), (as, cs), (b, ds & es), (cs, 0), (ds, 0), (es, 0) --- I know I can run hou.node("out/r").inputDependencies() to get the full list, but that doesn't give me the dependencies of each node in turn. I figure, like I said above, that I'll probably need to write a recursive function to spit these out. Something that runs over each subsequent list of dependencies until there are none then return the list. Somehow. But maybe not? I imagine there might be an internal to Houdini way to do this, no?
  21. I am using an IFD workflow, and I want to render an identical scene from 3+ different camera positions. I've come across several different ways of rendering these 3+ images sequentially, but that's not exactly what I want. I would like to make 1 IFD file that renders 3+ images from different camera positions. Is there a way to do that? I am working with a large dataset. For easy math, let's say that it takes 10 minutes to read/load, and then 10 minutes to render. Rather than doing three sets of load+render + load+render + load+render (60 minutes), I'd like to be able to do load+render+render+render (40 minutes). I have found that I can use the "Stereo Cam Template" (even though I am not rendering in stereo) to work with two of these cameras to do load+render+render in one IFD file. But how can I do this with more cameras?
  22. Hi guys, I had a problem while compositing my project. For some reason, around my object, on PyroSim there is a transparent strip that does not look beautiful. If I render each object separately, then I have this empty space (screenshot1 and screenshot3), if smoke + object in one mantra render, then everything is fine (screenshot2). But I need to have them separately for compositing. Here are screenshots of my render settings (object - spacesip and PyroFx - smoke) I would be happy for any of your advice, I see that there are a lot of cool guys here who know the houdini like their 5 fingers Please forgive me for my english
  23. Render specific frames

    i am trying to render out specific frames from my timeline, can this be automated and saved out to disk? i would like to have control over which frames exactly or control via a pattern, for example per 10 frames render
  24. How would you render the furthest ray hit surface? I'm not even sure where to start. Well, that's not entirely true. I have an altered shader using IsFrontFace to "turn off" the camera facing polygon. The problem is that this only gives me the next surface behind the first. Which is great if one is rendering a simple convex shape. But for a more complicated concave shape, like a wildly rippling blob of liquid, this isn't very usefull for comp. notBackHelp.hip
  25. Hi guys, I'm not quite sure if I'm doing something wrong here, but starting with houdini 17, whenever I'm using the surfaceexport-node to connect i.e. a classiccore I'm getting this warning: ‘Warning: /opt/hfs17.0/houdini/vex/include/physicalsss.h: Using uninitialized variable: nmax (247,26:29)’ - using computelighting doesn't yield that message… (tested under windows and Linux) Anyone else experiencing this? cheers, flo
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