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Found 314 results

  1. Hi. I have an image rendered with Mantra in Houdini. Please let me know if there is a way to do it with a python script. Do you know how to copy only this mantra node to Nuke and that image can be loaded directly from Nuke? Thank you.
  2. I am trying to do some point replication in mantra at render time with replicate point procedural shader but when I apply the procedural shader to the SOP geo that I want to render I get the error in the attached log and the render comes out completly empty. error_log.txt
  3. Pyro render issue mantra

    Hello everyone, i'm having an issue with rendering my pyro sim in houdini 18 in mantra, the sim is visible in the viewport but not able to render in mantra render view and idk why. I'm attaching my file plz help me out where i went wrong. thank you. campfire5.hip
  4. Pyro render issue mantra

    Hello everyone, i'm having an issue with rendering my pyro sim in houdini 18 in mantra, the sim is visible in the viewport but not able to render in mantra render view and idk why. I'm attaching my file plz help me out where i went wrong. thank you. campfire5.hip
  5. Hi Guys. I downloaded this FBX file a while back and it's been great. It's a Mark VI ship that's textured. I brought it into Houdini and mantra reads it well. The only problem is I'm using Redshift for the scene with water and I'm not sure how to get redshift to read the shaders or how to connect them. I can't seem to find any useful tutorials on this either. A couple years ago Grand Master Atom was amazingly helpful with a script that he wrote for redshift to read downloaded shaders but I can't get that to work anymore. I think the recent updates over the years broke that script or something. Anyone know how to connect so redshift reads the shaders? Pierre Mark_VI_Patrol_Boat_Dirty.hiplc
  6. Hey Guys! This issue is driving me crazy! When I try to render my model I get a bad artifacts in the shadows. I think its most mantra problem. Tried different renders (Redshift, Arnold) everything is ok. Tried many debugs. Did anyone had a chance to encounter this problem? Images and scene attached. bug_scene_v001.hip
  7. Hi Odforcers, does anyone know how to wire the 'fake caustics' VOP inside mat builder? (apart from using the principled shader, tx)
  8. Hi, I've setup a simple scene with a grid and a material applyed to it and I've exported the roughness map to an AOV, I've checked the Luminance values and they are different from what I see in Nuke, do you know why this heppens? Mantra values around 0.92 Nuke Value around 0.87 I've put in the attachment both the scene and the map Roughness.zip
  9. Hey everyone, so I've set up a scene with a principled shader and it rendered fine when I exported it to ifds and rendered it on our farm. But then I needed an extra AoV for an attribute to mask out parts of the object that has the shader assigned. In order to get that to render, I opened the principled shader and did a simple bind->bind export setup for that variable which then rendered fine locally. But from then on, no matter what I tried when exporting the scene to ifds, the object with the open principled shader would always render as if it has no material assigned. I tried forcing VEX shader embedding, which made the ifds quite a bit bigger and made me hopeful, but to no avail, all I get is grey shading. For now, I render the mask as a constant material in a separate mantra node but there has to be a way to output an attribute in an AoV when using the premade shaders. Any help is very welcome!. Thanks in advance, Paul
  10. Hi, I have mantra rendering issue. When rendering from render view is fine. However, when doing batch render "Render to Disk", I am getting critical error message as below. It was fine until 17.0, and this happened recently with 18.0 and 18.5. However, I suspect WINDOWS auto update significantly influences, instead of Houdini problems. If anyone knows how to fix this, it would be great, thanks!! My PC AMD Ryzen 9 3900X 12-core Northbridge AMD Ryzen SOC rev. 00 Southbridge AMD X570 rev. 51 NVIDIA GeForce GTX760 ASUS ROG Crosshair VIII hero wifi DDR4 128GB Houdini 18.0.499 Error ---------------------------------------------------------------- Command Exit Code: 139 4528: Fatal error: Segmentation fault -- TRACEBACK BEGIN -- Traceback from mantra 18.0.499 (Compiled on windows-x86_64-cl19.16): CURRENT THREAD 14400 +0x19b26f2f [UT_StackTrace::doTracebackIntoBuffer] C:\Program Files\Side Effects Software\Houdini 18.0.499\bin\libUT.dll +0x19b26c4c [UT_StackTrace::doTraceback] C:\Program Files\Side Effects Software\Houdini 18.0.499\bin\libUT.dll +0x19775b6b [UT_CrashHandler::setApplicationName] C:\Program Files\Side Effects Software\Houdini 18.0.499\bin\libUT.dll +0x19aa8194 [UT_Signal::processSignal] C:\Program Files\Side Effects Software\Houdini 18.0.499\bin\libUT.dll +0x2de6bf83 [seh_filter_exe] C:\Windows\System32\ucrtbase.dll See more in attached file error message.txt
  11. Hello guys, This is after much research that I resigned myself to a call for help First, my mantra freezes my computer when I tweak some stuff and see the result in real-time in the render view. I was advised to pause the render every time I make a change because of my weak computer (AMD Radeon 580x, Ryzen 7 2700X 8 cores, 32GB RAM). This improved and it crashes less. Now that I finally managed to hit the render to MPLAY or render to disk, it freezes at some point. Last time it was in frame 3. I tried to render with .exr, .tiff and .jpg, it is the same problem. I tried to adjust the camera frustum, which I believe reduces the area processed during rendering. Really nothing works (to my current knowledge), and this is supposed to be my first render! How sad!!! It doesn't generate a crash report (I think) as it doesn't really crash but freezes, and I have to force shut down my computer, which I did dozens of time and I am wondering if this is healthy for my computer to keep doing... I will upgrade my computer but at the moment everything is sold out so I am waiting. Any tips? Thank you very much
  12. Hello guys, I have a sphere that I use as a background for my render in Mantra. I am using an environment light with an HDRI texture as a source of lighting. My problem is that my background blocks the light from reaching my geometry. I have tried using Light Mask and the Light Linker but without success. Any ideas? Thanks a lot
  13. Hey guys. This shading effect was originally made on Redshift. Does anyone know how to achieve the same effect on Mantra? . I’m new to Houdini and this is way beyond my knowledge. Any help would be much appreciated. Here's the hip file just in case. LiveScalingBulletsSetup01.hip
  14. Obviously this goes against the concept of what tiled renders are used for, but I was wondering if it's possible to somehow render the entire camera frame inside only one tile of a tiled render? And then map a separate camera to the next tile and so on. Thoughts?
  15. in the attached basic scene I dont get the aliasing artefacts away. Tried so much things... no problem in RM. Would someone mind to check the file and give me some hints for the rendersettings? thanks in advance. nested_dielectrics_finish.hip
  16. Hi! I'm working on a project with pretty limited rendering resources and am trying to avoid an expensive environment light on my hero volume. I have dialed back Mantra's step size, shadow step size and opacity step size but I need more. I have also tried reduced the environment light's sampling quality but it seems to need to stay at 2 for my 16spp render. I am using volume shader core, and of course volume indirect is off. I am super-curious to hear any tricks to get a similar look to an environment light without an environment light. When I think about it, for a volume it is really the AO-style overcast day lighting that I really like. I think (but need to test) that multiple area lights on my volume would be just expensive as the environment light... but I am wondering if there are any old-school tricks to replicate the AO look with only point, spot and directional lights. Similarly, if there is any way to hack up an AO volume shader in VOPs rather than computing true lighting. I feel like there must be some old-fashioned ways of lighting volumes that can get me 80% of my look at 10% of my render time... but if not, I will at least learn more about Mantra!
  17. Hello Houdini friends, For upcoming automotive commercial project, UPP Prague is looking for Houdini generalists, with experience creating photoreal CG environments. Ideal candidate should be a resourceful and reliable artist requiring minimum supervision, and able to deliver top quality work within tight deadlines. Your work could range from generating high quality models, textures and look development (Mantra, Redshift), to creating modular, CG environments related Houdini digital assets. This is 4-8 weeks contract, starting mid-November 2020. Due to current restrictions, you need to be able to work remotely (VPN). For more info, please contact dominica.jandova@upp.cz, and include "3d enviro artist" in the subject line. website and showreel: https://www.upp.cz/advertising
  18. I am trying to create watermelon juice splashing out of a watermelon. Kinda struggling with the shader. I'm playing around with IOR and reflections but failing to get that translucent kind of look a juice has. Any help is appreciated. Thank you!
  19. Hi everyone, I'm having a bit of an issue importing Quixel textures, does anybody know a way round this? From the Quixel forums I have looked at, I think this might have something to do with the Quixel texture (jpeg) not being properly converted into a 'rat' format . Any help would be greatly received.
  20. Rendering thin lines Mantra

    Hi all, Recently I have been trying to understand a bit more about rendering. I was trying to achieve something similar with Mantra. My approach from past experience would be running a pop sim and drawing lines out of the particles to create straight trails as the picture shows. I would then volumerasterizeattributes an attribute like curveu which is ramped to control the intensity along the curve. It would essentially create a volume to render in Mantra and then use Micropolygon rendering to render the volume slightly faster than PBR. I would use a pyroshader and would wire the rasterized attribute into the temperature and density to give it some intensityand color. What I can't seem to achieve is these thin lines that are shown on the photo, I end up with a very thick individual lines in the volume regardless how low I push the pscale or how high the point count is. I assumed I needed more subdivisions to prevent the volume from stepping which solved the issue to some degree but took a tool by being a lot heavier in the scene, but I still can't get the thin lines like in the preview. Can someone explain their approach on how they would use POP's and lines to create such result as the picture shows, or just clarify that it is indeed a necessity to push the pointcount quite high and reduce the pscale in volumerasterize as low as my hardware allows. Thanks, C
  21. Mantra render process script

    Hello I want to know process of 3d to 2d. Do you know the location that process mantra script? (Ex) mantra.py)
  22. Hello! Thanks for come here. I want to know process of converting from 3D modeling to 2D with mantra render. (I mean i want see python code or parameter..) because I'd like to get the object's minimum and maximum value of x,y coordinates on Mantra renderer (you can see picture). how can i do?
  23. I have two sets of color data for a single geometry. One is the color that I want the geometry to look like when rendered. The other is black and white and I want to use that to drive opacity on the 'Constant' material that I have applied. I have tried caching the geo with b/w and then using that on 'Get Attribute' node in the shader network. I tried a few settings, but it just turns opacity to 0/black and my geometry isn't visible after rendering. The geometry that I am working on is a polywire output. They are a lot of long and thin cylinders. Each cylinder has a gradient from one end to the other. This gradient is the black and white color that I want to use for opacity. The required output is to have these strand like objects have an opacity gradient. Where one end is invisible and the other is visible. I have the color data that has mapped it as I want. Just need a way to use that data on opacity parameter on the 'Constant' material. So what can I do to achieve the aforementioned output?
  24. hey people! Im having a terrible problem here. Im doing a guided ocean sim, problem is im doing a 0.004 particle separation and meshing. My final mesh is around 4 mil polys and The moment I try to render it with a simple 2k spectrum I get over 50gb in ram usage. Is there a way to reduce the ammount of polies at render time for displacement? I tried the dicing quality and flateness but nothing seems to work I can't even render with with a principled shader and a small scale disp noise. Same problem The camera is a close up, but I get the same problem even with the mesh on 10% of the screen Im using a 64gb setup
  25. Hey guys, I'm facing a problem when I want to render my extended ocean. Mantra crashes during the displacement creation process, and I'm pretty sure it's not an hardware issue (Ryzen 2700X, 64 gb ram). The output mesh is pretty bizarre : I have a surface created under the mesh when it should be flattened and so there should be no surface here : I dont know what's causing this, but I'm pretty sure that this makes mantra crashing everytime. I tried using a grid instead of the mesh and it's working. I think that what's causing this issue is that when I simulated the fluid there was no particle under the collider and so it results in this weird mesh, I'll try to simulate again with a larger particle layer to see if it solves something. Here are the meshing parameters : I can attach the file if needed but as there are heavy caches that needs to be calculated it may bothers when looking for the bug. Cheers,