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Found 102 results

  1. New tutorial at CMIVFX about creating fire and flames, check it out
  2. I'm clearly being an idiot here. Can someone explain to me why if I render a pyro sim from two different cameras it looks totally different - even the alpha is different? One is wide and far the other is close up. One directional light, mantra. Is this a scattering issue within the shader? I'm using the stock pyro material but I've removed the flame colour bits and thrown in a heat>fit>ramp into the emitcolor instead.
  3. Hello all, Has anyone else run into this issue? Using Houdini 16.0.597 on Linux, I created a flip sim, used the Ocean Flat tank setup and created an extended ocean and all works well. But at render time, the flip part of the sim that sits above the waterline appears to be missing something and renders very dark. I have checked the reflect/refract limits, checked the displace bounds and I'm using the standard oceansurface shader. I have generated a suitable interior volume, and the issue is there with or without the interior. I have a screenshot of the issue (taken with my phone cam so apologies for the quality) - just the ocean surface, no interior. I have tried with simpler sims, different settings on the shader, and the problem persists... Any advice would be appreciated! Thanks, Matt.
  4. I put together a simple intro to writing/rendering IFDs, using Packed Disk Prims to make better IFDs, and using HQueue to efficiently generate IFDs for rendering with Mantra. https://vimeo.com/223443000
  5. 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
  6. Anyone keen in sharing their setup for vector / 2D rendering ? I'm looking for some options similar to Rhino on how to render more technical drawings (wireframes. solid shading, ...) Thanks!
  7. 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
  8. 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?
  9. Hello everyone, I'm beginner in water simulation and I would like some tips if it's possible. For the simulation part, I'm not in trouble for the moment, but the rendering it's another thing. I'm trying to make an ocean flip simulation of a submarine going out of water, for the ocean shader, I have something pretty good now with ocean spectra and the ocean shader of houdini 16. The problem is the whitewater, for the ocean surface (the flip mesh) I don't know how to do the white part like in the sreenshot, is it particles, or tweaking the shader with velocity or vorticity, but which parameter in the shader (refraction?) ? And for the foam, spray, bubbles , I have to render simple particles or do another thing? Thank's for your help, I want to learn water, it's very fun to do! I let the breakdown of the screenshot here
  10. I've been practicing particles using Rohan Dalvi's Tutorial:Rohan Dalvi's tutorial Everything has been working great so far except for one major thing. If i compare my renders to Rohan's, my particles seem to clump together and generally have a larger scale. The left picture show's my particle render and the right shows Rohan's One issue i've considered to be the cause of this is that Rohan is using VOPSOP from 13 I'm using 16 and point wrangles, so maybe something is going on with the scale in there. I still only have a couple months of experience so any help would be great. Cheers ParticleDisintegration.hipnc
  11. 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
  12. Hi, I have some particles that I was trying to use instance to Copy lights on them. But I want to control their intensity base on random point/id numbers, so each particle will follow different intensity. I couldn't come up with a way to control the lights intensity for each individual particle separately. I came up with the idea of using copy stamping after my popnetwork node. but I need to use a way such as object merge, but unfortunately it doesn't support lights. I would like to know if there is anyway to import light in my nodes with something like Object merge. Any idea that how can I do that or how can I control each individual lights intensity based on random id/point number? Thanks
  13. Hi everyone. I've got a little problem, I'm trying to render my work in mantra, but the problem is that houdini reload the geometry for each frame and it's a bit long. When i render it in the render view everything works well, Houdini loads the geometry once and render each frame very quickly, but when i render it on the disk , he loads the geometry for each frame, and i don't know why. what i render is just a simple sphere instance on a lot of point , arround 10 million. Is there a way to cache the geometry for the render ? Thanks.
  14. Hi everyone, Here's a weird one: I am trying to use the crowdsource to copy a simple agent animation on a point sim. It is basically a swarm test. Now the problem is that when I try to render my agents they render as boxes. So far I have done a couple days of research but I didn't seem to be able to find a solution or anybody with my same issue. The simple answer that I gave to myself was "use the copy sop with some timewarp stamping for each point" but the copy sop gets too heavy to quickly. Does anybody have an idea of what am I doing wrong? I have attached a zip file with the hip and the fbx of the bee animation. Thanks for your help! bees_test.zip
  15. Hi all, I am encountering some strange artifacts while rendering a flip sim with mantra. I applied a platinum preset material to the mesh, environment light with HDRI and rendering with Mantra. You can see the artifacts all around the edge of the splash in the video below. I smoothed the final mesh quite a bit on the particlefluidsurface and it helped a bit, but still getting serious artifacts. I also tried remeshing and subdividing as a post process to the mesh it but that introduced new problems where the mesh would look totally unstable. My guess is that it might be doing that because of the constantly changing topology of the mesh? Maybe these meshes were not designed to be rendered with anything but a fluid like shader? Is there anything I can do about it? Attached video and file (using mesh from OUT node in Mesh obj node). Thanks, Top Down Test_1.mp4 CrownSplash Anim.hiplc
  16. Hello Everyone, I'm offering a 25% discount on the "volume rendering using houdini and arnold" tutorial. The techniques demonstrated in this course are 100% applicable to Houdini 16 and to the latest arnold version and to volume rendering using arnold in maya, cinema 4D and or xsi. Preview: Same techniques used to render these volumes: Get it now: http://www.cgcircuit.com/course/volume-rendering-using-houdini--arnold?affid=e245f471eae8980461f2286ce070ff396d6ffc54930aad03cf3d811923ff74900aff8e3de73a75c248b4ff557c8d5f8b12788af79c176c15116b82b6fabc2310 Enjoy!
  17. 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
  18. Hello Everyone, This training is an update to the Tea and Cookies training. The training covers fairly similar topics such as modeling, shading, lighting and rendering. The primary difference is that instead of Mantra the training focuses on using the third party render engines namely, Redshift, Octane and Arnold. The modeling part of the training covers a variety of techniques ranging from basic poly modeling, VDB, fluid simulations and even POP grains to build the scene. This shading and lighting part primarily focuses is on building all the various shaders required for the scene using a variety of procedural textures and bitmaps. The training will also cover SSS, displacement and building fluid shaders using absorption. We will also build relatively detailed metal and plastic shaders. Trailer for further details kindly click on the link given below http://www.rohandalvi.net/dessert/
  19. Check out the new tutorial about creating explosion with pyrofx in Houdini. https://www.cgcircuit.com/course/explosion
  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. Hi guys I recently created a free asset to test shaders in a consistent environment regardless of the scene I am. I am kind of old school and feel a consistent shading testing area is very comfortable to create different shaders. The idea is that no matter what complex scene you are in, you can just bring this asset and then test render shaders on a tri light set up with background and env. light. The asset itself is very flexible. multiple shapes test, and grid or plain background. You can even bring your own object or shader ball into the scene. You can find the asset here: https://www.orbolt.com/asset/Butachan::nh_shadertest::1.0 Please read the instruction as I made the asset object, light camera, and actually everything invisible in the scene so it doesn't really clutter the scene you are working. I also made it open because as it is a render related asset I feel it will need some tweeking here and there to adapt to your needs. Bests, Nico.
  22. Hi. I'm new to Houdini. I used Softimage for 20 years then went to Maya but am giving AD the bird and learning Houdini. Something I haven't found is a clear definitive guide on how to set up different render passes in Houdini. I see a few different approaches but none seem like the THE definitive way it should be done. Is there a tutorial or video or something about the best way to do render passes in Houdini? Thanks! Lawrence * I originally posted this on the SideFX forums but got no response
  23. Just want to put all the extracted image plans (diffuse, AO, reflect, etc...) into there own directories(folders), is there a way to do this?
  24. noob query: anyone knows why this is happening (please refer to picture) thanks in advance m.
  25. Hello Everyone, This is a fairly long introduction to Arnold in Houdini.