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Found 211 results

  1. Hi guys, I'm trying to write a light path expression that excludes the default custom bsdf label "coat" To have only the coat layer is: lpe:C<...'coat'>.* To have all reflections but the coat I would expect it to be: lpe:C<RG[^...'coat']>.* This gives a syntax error and doesn't seem to work. Has anyone tried this before and knows the correct syntax or is this a bug? Cheers, Luca
  2. Hi, I am currently trying to use mantra in distributed rendering mode. (mantra -H machine1,machine2) It all works as expected, but as soon as I connect something into a cached shader (for example a constant into the principled shader), the error “No Code Generator Available for opshader_path_xyz” pops up and it doesn't render at all anymore. It also happens with custom cached shader assets. All works well in non distributed rendering mode. If I unlock the asset, then it seems to work again since the asset is then "in the file", but this is unfortunately not useful in production. Additional Info: I am using windows and the “Force VEX Shader Embedding” checkbox is on. Has anyone experienced this error before? If no I'll submit a bug report. Cheers, Luca
  3. Hey, iam using a simple glass material with some tweaked parameters and i rendered out one single frame, it took me 1.5 hours to render it complety and i still got a decent amount of noise? Im using a hdri image for lightning and increased my samples from my lightsources to reduce noise. anyone would know how to reduce my noise? This are my render settings.
  4. Modulating Motion Blur

    Hello, you helpful people, I'm currently doing snow VFX and I'm a bit bothered by the tube-like look of the mantra motion blur. I'm also using VRay quite a bit which has some helpful features to make the motion blur look less sterile, especially two settings, as shown below. The first setting allows me to move more samples towards the centre of the time interval, simulating a shutter that's not instantly opening and closing. The second setting allows me to move more samples towards the front or the back of the interval. Using the two settings combined, I've quite a lot of control over the look of the motion blur. Is there anything comparable in Houdini or are there some tricks to emulate that look? I think I've diligently read what I could find about motion blur and mantra but I couldn't find anything comparable. Thanks in advance! Paul
  5. Hello! So I just started dabbling in FLIP and have a little river scene everything looks decent except for the whitewater. It takes forever to cache but I have the rasterized particles cached out and the standard particles will be finished caching later this evening. I've played with the spray shader but it looks kind of weird when applied to the rasterized particles, especially with the noise parameter that's [on] by default. I also read a few posts that suggested trying a billowy smoke shader instead. That made it look much better but still not correct so I figured I needed the regular particles cached in addition to the rasterized ones. If that's so they're caching now, but when they're finished what do I do with them? Last time I had whitewater particles cached they just rendered as spheres because of the pscale, am I supposed to mesh them like the FLIP and then layer them? I can post some screenshots once my cache has finished.
  6. Hey ODforce! I recently published the next installment of the Houdini For The New Artist series. This course is all about making Houdini easier to learn, and you can watch the first chapter for free! Here's the link: http://bit.ly/2okYpY4 Some of the main topics include: Chapter 1: How to understand and set up DOP networks Using SOP attributes with the dynamic context Forces Particles Life & Variance How to use groups Rendering Particles Sub-steps, Sub-frames, & Time-Steps Caching Sub-steps & Practical Applicaitons Chapter 2: Texturing & Lighting Techniques How to Integrate a Substance Painter Workflow with Houdini Spot Lights, Area Lights, & Artistic Considerations When Placing Key Lights Utilizing Light Attenuation Gobos Aim Constraints, Near-attenuation Techniques for Reading & Emphasizing Form While Lighting How to Make Light Blockers Shadow Masking Techniques for Controlling Light Placement Component-based Lighting Light Linking Chapter 3: HDAs, Velocity, Normals, and & VOPs What is an HDA? How do you make one? Data Types & Adding user Parameters Booleans, Switch Nodes, & Parameter Behaviors Additional HDA Modifications What is Velocity? What are Normals? An Introduction to the Point Wrangle Introduction to VOPs How to Blend Materials Basic Noise Parameters Additional VOP Techniques Chapter 4: Geometry Types, Animation, & CHOPs Geometry Types & Attributes Introduction to Volumes Animation Basics Channel Groups, Animation Layers, & Motion Trails Introduction to CHOPs Curve Constraints, CHOPS with DOPs, & Additional Settings Chapter 5: Rendering & Compositing Introduction to Multi-pass Compositing Rendering Concepts How to Use Takes Rendering Multiple Jobs De-noising passes Compositing Basics with Houdini Thanks for watching! - Tyler
  7. Hello everyone, I'm trying to set a blackhole effect like gargantua in Interstellar, in a low cost way. The idea is to us a grid as a renderer, parented to a camera (sticked to its frustum), to send a ray from camera position, through the grid, to a sphere and if the ray sent is in the periphery of this sphere it curls/bend. I have found the script to do that in another software but I don't know how to get the global ray direction information and how to use it. I thought use a snippet in a material to write the script and put the material on the grid. Maybe it's not even the most relevant idea to do this effect. I'am open to other solutions Don't know if I'm really understandable ^^' Thank you anyway in advance
  8. I've noticed in mantra when I'm using a shader that has a very low roughness the reflections of my environment light HDRI are blurred/low resolution compared to the actual image. Is there a way to increase the resolution that my HDRI is being sampled at in reflections? I've made a test scene here with a grey + chrome ball, and a perfectly reflective ground plane to show the issue. Thanks! envlight.hiplc
  9. I have a main volume that I want to render. however In that volume I would love to be able to merge other volumes into it and use those volumes as extra image planes. This means that my second volume should NOT show up in my beauty pass, but be available as an AOV. is this possible? Right now I have it setup so I render the second volume separately, but I wonder if the other thing could be done?
  10. Maybe a basic question, but every studio I have worked at so far have had a custom node usable in the ROP context to fetch a cache. This way one was able to setup dependencies from your cache nodes to your Mantra ROPS. Is there a way to do this using standard nodes? I looked at the Fetch node, but it seems it can only target other rop nodes, like a rop in cops or similar. Cheers
  11. Houdini Lighting Artists - ETC LA

    Hey guys, we have a big need for Houdini Lighting artists here at Electric Theatre Collective LA. Any referrals are also welcome!
  12. Houdini mantra shadow~

    i just need self shadow don't need the shadow on another object how to do it?~Thank you
  13. Hi, I hope I'm not asking a question with an obvious answer, please refer me to the relevant resource if there is one! I have a geometry which rests on a plane. After rendering with mantra, looking at the edges of the geometry which rests on top of the plane, these are looking strangely bright ( I've tried with different light sources, different samplings, etc...) I have recreated said issue with a basic box on top of a plane ( see attached images and hip file) The same issue still occurs if I move the box down, and make it intersect with the plane. If any relevant, this is with Houdini Indie 16.5.496, on Mac OS High Sierra 10.13.5 Am I missing anything obvious? Thanks in advance for any suggestion you guys might have! close_up_Active_Render.0001.0.exr higher_point_Active_Render.0001.0.exr funky_bright_edges.hiplc
  14. Hi guys, I am currently building a environment for which I want to instance a lot of mega scan rocks. I am using the instance object so that I can instance thousands of the rocks with a huge hit. The problem is now that I turn on the displacement on the rocks everything comes to a halt. It looks like mantra is placing all the objects and then dicing and displacing the geometry. Is there a way of dicing and displacing the geo first? Should I just bake the displacement into the geo?
  15. Speed up Mantra IPR

    Is there a way to stop Mantra from regenerating Scene ? at the moment I am working on some Shader and Texture work and and have only a Plane and a basic light and everytime I drop a node on to the IPR it regenerates the scene and makes my work for parameter changes very slow...
  16. Hi, I want to render a custom pass for clouds in mantra. The reference jpg shows a custom pass from Maya (density / ambient) and the alpha for the same clouds. In Maya a gradient ramp was used on the incandescence channel. Basically where the clouds are denser should be black and the opposite, for lower density I should have white. Can I replicate that with mantra? I'm using the sky rig tool so everything is calculated at render time. Thank you!
  17. Hi everyone, I'm trying to render a scene where my lights change colour/intensity between frames. I was hoping to see these colour changes in the motion blur but when I try and render it the light just stays a constant colour/intensity even though I can see it changing when I scrub through in the viewport. Has anyone else managed to get something like this working before in mantra? I've set up a simple test scene here with one light animating around and changing colour & intensity. Cheers! MotionBlur.hiplc
  18. Showreel 2018 Tom Freitag

    Hello, I am FX/CG generalist. Here you can watch my new showreel compiling some work for feature film, commercials, personal work and R & D. I am available for freelancing remote or berlin based studios. Breakdown: https://www.dropbox.com/s/94tmwcmkmk279c2/breakdown_reel_2018_tomfreiag.pdf?dl=0
  19. Hi all, First time poster, very new Houdini learner. Attempted to render a FLIP fluid simulation in Mantra, rendered to disk. Changed the file save type from .exr to .pic as I had read that this removes the watermark for Apprentice users. The render took 4 hours, however the resulting file output is a single .picnc file of 2017kb. Having looked over the Mantra parameters (screenshots attached of what I thought might be relevant information) I can't see anything that might explain why this happened. If anyone has any suggestions they would be greatly appreciated! Thanks in advance for your time & advice.
  20. Why is the roundededge node so buggy? I want to use the node as alpha in a layermix node. When i do so, i always get a message the my pc is running out of memory (i have 128gb ram). Somebody any solutions? kind regards
  21. Deform Bend Camera Ray?

    Is there a way to bend the I-ray over distance when rendering? Trying to do something similar to Interstellar space bending scenes. So far I got it partially working with multiple frustrum planes in front of the camera (at different distances). Those carry a shader which continues the I-ray in an offset direction (using raytrace). This seems pretty slow. So I was wondering if there is any other way to do something like that? Was thinking of using a volume / volume shader for that, but that might get a bit excessive ...
  22. hey I'm rendering some fluid with mantra, and I noticed that if I turn on motion blur the fluid gets darker, I thought it was an issue with low samples and noise, but even if I crack up the samples the fluid is still very dark compared to the image without motion blur
  23. Hi everybody, thought I'd throw up a simple file to demo the problem, In the context of rendering a flip sim mesh in mantra, with the env geometry as both holdout 'forced matte' and 'forced phantom' to have it still show up in reflections and refractions, I have a situation where by adding the object as forced phantom, it cancels out force matte. But as a work-around - it seems if I duplicate that same env geometry, by copy&pasting the sop, and setting that new sop to be the phantom and not the original, mantra renders as expected. Go figure... Cheers, Matt 01 Render with everything visible 02 forced phantom cancelling forced matte 03 both forced matte and forced phantom working after sop object duplication phantomHoldoutTest_v001.hip
  24. I'm trying to render out a volume inside of a clear object and running into an odd materials glitch. To test I have created a box with a default glass principle shader and a VDB volume of the same box shrunk down inside the box which I have colored blue. Rendering with Mantra, if the volume is inside glass box, it loses all color, but outside keeps it. There is one other issue. I really want the volume to filter the light to color, so the shadow/rays coming out of the volume should be roughly the same color as the volume, as opposed to being black. volumeTest.hipnc
  25. EXR meta data issues

    Hi there, I'm trying to set custom data as meta data using the mantra render attribute: "vm_image_exr_attributes" according to the docs i should be able to parse the attribute a python dictionary object, however whenever I try to do this: test_dict = {"count" : 0, "path" : "/jobs/"} my_node.parm("vm_image_exr_attributes").set(test_dict) I get the following error: TypeError: in method 'Parm_set', argument 2 of type 'std::map<std::string,std::string,std::less<std::string >,std::allocator<std::pair<std::string const,std::string > > > const &' What I am trying to achieve is a dictionary comprised of file paths that I can then check in nuke. Can anyone shed any light on this? thanks
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