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Found 157 results

  1. Hey guys, i can provide my scene if needed, but my problem is after 2-5frames rendering to disk Mantra literally just stops/freezes rendering. Ive changed my frame ranges, new mantra render nodes, pathed to a diff hard drive which i thought had worked but didnt. Just seems ridicolous, frames that are rendering are coming out exactly as wanted, Just dont understand why its freezing for no reason? heres the scene too; Any help would be great as im trying to do some test renders and at the minute not suceeding due to this issue ocean_v2_t7.hipnc
  2. Goodmorning everyone! So, my problem is t he following. Everytime Im building a scene, no matter if complicated or simple, my mantra output comes out black. If I open a fresh Houdini scene. Place a box, light, camera and the same mantraROP it renders just fine. However if I make even a simple billowy smoke preset the render comes out black. Any ideas? Houdini 16.0.504 Indie
  3. I have experience using deep rendered images as a compositor at large facilities, and while the file size is large, the ability to work in nuke while slower is still functional and the benefits of the deep render outweigh the file size and comp slowdown. I am doing some testing with Houdini for a whitewater sim and the DCM output is gigantic.. depending on the particles on screen, file size maxed at 3.2 GB for an exr frame. Nuke needless to say can't handle this, even Houdini's output of a DCM with a relatively small amount of particles will bring Nuke to a dead crawl. It seems like there are quite a few DCM settings buried. Does anyone have any experience on optimizing the DCM settings to get a result that is good but saves on file size and computing for Nuke? Cheers, Ryan
  4. I have a long-ish PBR render (4-5hr frame) that ran to 66% with checkpoints enabled before timing out on the farm. I resubmitted the frame with checkpoints enabled and got the message: >Resuming from checkpoint file: read 4040 tiles from /path/to/bla_sh004_lighting_v010_bty.1062.exr.mantra_checkpoint (I presumed this meant a successful resume) I then watched as my new render started from exactly the same tile as the first render... it didn't seem to actually skip any part of the render. Is this expected behaviour? Am I misunderstanding checkpoints? I figured this should start back up SOMEWHERE near the percentage of completion I got up to previously, but it appears that's not the case... edit: interesting observation is that looking at the images in Nuke, the same tiles (up to 66%) in the EXR are there - just a hunch that the new render is just rendering straight over the old tiles instead of recognising that they've, in fact, been completed. Is this possible?
  5. Hi all! I'm doing some research on rendering pyro explosions, and here's the result of my comparison between mantra on houdini and renderman 21 on maya using a vdb cache from a pyro explosion. https://vimeo.com/218752467 my thoughts I'm pretty happy with both of them, fire looks detailed as I expected from the hi res sim, and I like the way the light scatters through the smoke and lit it. renderman version came out "hotter" in terms of color than the mantra one, but I guess is something to do with the way blackbody radiations infos were passed to the emission component of the shader, so I can probably get closer one to the other by remapping values in a slightly different way mantra pros render the explosion with mantra was fast in terms of setting up the scene, and the shader is much easier to play with. It's also nicely setup when you create the pyro sim, so you can get a nice looking fire in a few click. cons I found render time slower than renderman, and I couldn't find a way of getting rid of the huge amount of noise in the meshes lit by the explosions (especially when the core of the explosion is brighter) , although my render settings are pretty high (I think): pixel samples 9/9, min/max ray samples 1/9 with noise level 0.005, diffuse and volume limit 5 renderman pros I managed to get faster frames with less noise on the surrounding environments cons set up the shader was kind of a pain compared to mantra. I needed to import fields and remap some values to make them work with PxrBlackBody, nothing too complicated but far more slow compared to mantra I'd really like to get feedback, ideas, personal experience or anything you'd like to say about it
  6. Hello community, Some months ago I asked how to achieve this kind of effect Blackpixel user at sidefx forums did an awesome job with a mantra shader, at that time I was just learning the basics so I get stuck trying to understand, here is the post if someone wants to check out ( https://www.sidefx.com/forum/topic/44970/ ) I'm uploading the file that blackpixel did, all in mantra with shader builder, now that I learn the basics of shader builder I'm trying to really understand what he did, here are my thoughts: So he take a worley noise (4 points) and split up to 5 fit ranges, one is set to the refraction, he multiplies 2 to get the displacement, then he does several multiply with colormix, is this to get the colours on the borders? I tried to do it myself from scratch (attaching the hip too) with a similar but not the same result, I started adding one by one to see what is doing but I can't figure out yet. My main cuestion is, from a designer point of view, lets say I want to create a shader that is black/milky (btw he isn't using SSS but it looks like), how should I think to say: this will be the plastic hole, this will be the border one, this will be the main surface, I guess he's doing all of that dividing the worley in fits right?, mantra is kinda scary yet so powerful. Sorry for the long read Cheers! worley_holes_blackpixel.hip worley_holes_caskal.hipnc
  7. Houdini 15.0 - simulated using flat tank, and custom forces added in front and back of ship to get the wakes.render time : 15-20minsrendered in mantra and comped in nukeThanks to my mentors who taught me the awesome tricks to achieve the results.model downloaded from - cadnav.comAny advice or feedback appreciated.
  8. Hi all, I wasn't sure whether to put this into shading or effects, so it just ended up here. The title says it all - is there a way to move points at render time? Just apply a noise or something like that, essentially a render time VOP Network. The reason is I have a heavy piece of geo that just needs to sit in the background and wobble slightly. That's all. It seems very wrong to write out geo for every frame.
  9. I'm having trouble with mantra rending hair with houdini16. I keep getting an error message. [17:06:10] mantra: Unable to resolve geometry op:/obj/geo1_deform/OUT_GROOM. Please ensure the object is included for rendering. You can turn off vm_renderable if needed. Invalid detail specified Invalid detail specified Invalid detail specified I don't know how to turn off vm_renderable or what is causing mantra to fail here. Is this a bug? any help much appreciated B
  10. Hi, I just released a new tutorial about lighting and rendering with Mantra in Houdini. Over 5+ hours of content. Topics include Cameras, Lights, Lighting Setups, Materials and Shaders, Render Settings, and Scene Management. If you don't know where to start with Mantra, or with lighting and rendering, in general, this is a pretty good, comprehensive explanation: http://helloluxx.com/product/houdini-training-learn-jumpstart-vol-8-intro-to-lighting-rendering/ -Adam
  11. Hey all, The team at Psyop just open sourced their ID matte toolset called cryptomatte. I started working there a couple months ago. we are looking from some contributors for Mantra implementation for the project! anybody interest? https://github.com/Psyop/Cryptomatte Have look and if your interest hit up the team, we are eager to make this apart of mantra Cheers!
  12. hey guys we are hitting a wall. kinda thought it should be simple, but the motion blur in Mantra isn't matching the motion blur coming from Maya-Vray render. any tips or the reason why this would happen? thanks
  13. I'm watching Houdini 15 Masterclass | Shaders and Shader Building tutorial which shows the pbr specular node. I can't find this node in houdini 16. I find a specular node that also has an f output but not the pbr specular node. even though it is in the Houdini 16 docs. Is this node included in houdini 16? Has it been removed? thanks!
  14. I'm trying to render out my file under two separate mantra nodes, one for the particle simulation and one with the lighting. Neither of them seem to be working? I went to render and it stopped and now the mantra nodes are red. Any suggestions please? Ball Pit Ball mantra nodes.hipnc
  15. Hey guys, I'm new to mantra, made a material and I'm trying to animate, for example changing te offset on the noise or the displacement amount, but seems not having effect (i'm renering in mplay), also tried promoting parameters with no luck. Displacement says: cannot have channels wich depend on time Also Im trying to get the artifacts out, added some dicing to geo node as well as in rop, should I increase more? Thanks! mantratestanim.hipnc
  16. how to create the effect where the trail created by motion blur is faded off instead of being solid through out. in renderman it's achieved with shutter effects, but i could not find anything similar in mantra. Please help.
  17. Hi everyone, I've noticed an issue shining a light through a refractive material. The refractions don't seem to be energy conserving. Using a point light with intensity 1, exposure 0, no attenuation, shining through a grid with a basic mantra surface material with refractions enabled, the brightness values of the resulting pixels in the render are extremely high. Some are as high as 4,000. Why is this? In this thread, Symek mentions that the BSDF model is not inherently energy conserving, so it would have to be applied post-process. Seems odd that this wouldn't already be done in SideFX's shaders... If that's the case, though, how can I make refractions in the mantra surface shader energy conserving? Thanks, Chris EDIT: Forgot to upload sample scene, here it is light_refraction_broken.hip
  18. Hello, everyone! I'm very excited to share my Procedural Lake Houses tutorial series, where I show how to generate the houses all the way from base silhouette to final shading. Example of the Generated Content: Link to cmiVFX page: https://cmivfx.com/products/494-procedural-lake-house-building-creation-in-houdini-volume-1 Thank you for watching and have a good day!
  19. Still a Houdini novice, but curious what all the fuss is with 3rd party renderers. Especially hearing a lot about Redshift. Can any experienced Houdniks summarize the key advantages of Redshift over Mantra? RS apparently used to create this impressive still http://jm-b.cgsociety.org/art/sculpture-maya-woman-houdini-nude-redshift-flower-figure-pose-dry-ballisticpublishing-cfe-expose12-figures-adult-3d-1345912
  20. For anyone rendering scenes with mantra, and have lots of lights, there have been some amazing optimizations that showed up in the last few days. The scene has 528 disc lights with varying colors: 16.0.504.20 11m 51s (no active radius) 8m 29s (active radius 3) 16.0.535 3m 28s (no active radius) 3m 13s (active radius 3) 16.0.537 1m 18s (no active radius) 1m 9s (active radius 3) I haven't had a chance to try it in 15.5, since the scene was built using several H16 nodes, but if anyone else gets the chance to compare against 15.5, that'd be cool!
  21. Hello guys, I'm working on a Bifrost liquid mesh that I imported into Houdini to render it with mantra since Maya couldnt manage my huge alembic file ( +300Gb ). There is no foam yet since it's in the process of meshing but I wanted to know what do you think about the liquid mesh shader ? I used the Ocean material from Houdini with some adjustment. Thank you guys!
  22. Hey Guys, this is the first visualisation of a project for school. It's a Floating Island which has 4 different areas. A grasland, a sand desert, a swamp area and on top of the mountain an ice land. The base geometry was made with WorldMachine 2 and also the base textures were made with this tool. After that, the base textures were edited in PS. All of this data was then imported in Houdini and things like clouds and plants were added. Also the shading, lighting and rendering was done in Houdini with Mantra. This is my first project in Houdini, Greetings Chrizzo Floating Island_Konzept_V1.0_Ani_01.mp4
  23. Hiya! I'm still new to Houdini and I was wondering if anyone had made use of 3D decals (projected textures) in Houdini? I've found them really useful in the past and I was wondering if anyone had played around with them. They look like this kinda thing: I'm not talking about the Decal material node, I mean things similar in effect to what is talked about in this blog post. Thanks!
  24. First things first: – This is not a “why Mantra is so slow” topic. In fact, Mantra is my first renderer, so until now, for what I read, it seems pretty fast and good. – I came from a digital product design background and I’m really new to 3d and Houdini. – I’m using a MacBook Pro for learning which I know its definitely not the best machine to work with 3d stuffs. (Specs: Mid 2012, 2.3Ghz i7, 8GB RAM, GeForce GT 650M 1GB) So after this (not so happy) presentation, lets talk about my problem: I was doing a tutorial from Niels Prayer about how to make a geometry react from an audio file and after that I've tried to render a sequence of 860x540 images. I waited 14 long hours for about 12 secs of video. Is this normal for my computer specs? I forgot to cache the geo, but I don’t know if this could be a great factor to get a faster render, could be? I've read some topics about Mantra settings from Odforce and SideFX forum and found some interesting tips about how to get better and faster rendering trying to get down the pixel sample values, increase the max ray samples and tweak the noise level to an acceptable value. So I’ve attached a hip file with my Mantra settings, and my machine can render this frame in about 3:13 min. This is current the best I can do in terms of speed and quality. Do you guys can check it out my file and see what I can do to get a faster render? Please feel free to hit me with tips on how to get the best of Mantra and Houdini in general. Thanks a lot. Cheers, render-test.zip _render_test_1.exr
  25. i am starting to experiment some Non Photorealistic Rendering. First i am starting off with non animation Versions. simple point replicate rendered disc's: Houdini viewport: constant shader in mantra: working out some edge strokes and rendered with toon shader: scene Files: point_repli_v001.hiplc point_repli_v002.hiplc