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Found 191 results

  1. Hello! I just got myself a threadripper 3960x for freelance simulation purposes etc. My workstation is now up and I'm doing some performance tests. I'm getting some very unexpected results when rendering in mantra. And I'm very curious if someone can help me understand what's going on under the hood? A simple scene I created(with some geo, lights and reflective materials) takes about 2 minutes to render in mantra in bucket mode. All good and as expected! The same scene takes about x3 times as long in progressive mode. If I monitor the core activity, they're almost idling while rendering, then suddenly, about halfway through, they all accelerate up to max speeds and finish the render in seconds... Anyone wanna take me to school? Thanks, Joachim
  2. hey guys, do you know if it is possible to use intrinsic information in a shader? something like intrinsic:indexorder in a render state just like with packed attributes. also, still in a render state, packed:primnum or packed:ptnum doesn't seem to be working. if i make an attribute in a wrangle on packed prims, let's say i@primid = i@primnum, and i call that in the shader with a render state it works as expected. any idea? thanks Martino
  3. Hi all, this is a technical question to help me understand what's going on under the hood about how geometry lights are rendered: I am playing with writing my own raytracer within Houdini, where I also want to use geometry lights. The way I go about it is that each shaded point does a shadow test to a randomly generated point on the surface of the light geometry. As this happens completely at random it is somewhat likely that the generated point will lie on the far side of the geometry, so the light geometry itself will cast a shadow (self shadow on). This results in the first attached picture. This makes sense to me - if you consider a shaded point on the wall behind the turquoise cube - it has only a 1/6th chance of generating a point on that cube that it can actually see whereas a point to the top and right of that point sees 3 sides of the same light geometry, therefore it has a higher chance of generating a point it is illuminated by. This is not what I would imagine seeing in real life (though maybe my conception is wrong). However when I rebuild and render the scene in Houdini/Mantra (type geometry with a box as geo and self shadow on), the result is very different (see attachment 2). Maybe someone can shed a light on how Mantra does its magic. Cheers!
  4. Forest Fire

    Forest Fire entirely done using Houdini and Rendering in Arnold.
  5. Quick question. This is the diffuse AOV from a render using nothing but a distant light. To give you an idea, this scene is rather large. The geometry in this scene is a ocean volume and a plane. I have removed the displacement map from the material to isolate this as much as possible. I can not for the life of me find what sampling quality I'm missing here. Does anyone recognize this kind of circle pattern coming from the light?
  6. Reflection with alpha

    Hey everyone, I've got a question that, even after lengthy research still has me stumped. I've got a pyro fireball and a ground geometry that reflects the fireball. The simple question is: How do I set up the ground plane and its material so it reflects the fireball, including alpha, and just gives me a black alpha where there is nothing to reflect? I've tried to force it to phantom, that just makes it invisible, other, somewhat hacky workarounds like this one are rather old and in the SHOP context. Nothing I tried seems to work. When I'm working in 3ds max and Vray, I use this technique all the time (vray object properties -> reflection/refraction matte), I just don't get how this can be this much of a faff in Houdini, so I'm probably missing something pretty obvious. I'm grateful for any and all help, thanks in advance!
  7. Hi all! There's 1 week left to register for my Mastering Destruction 8-week class on CGMA! In supplemental videos and live sessions we'll be focusing on some of the awesome new features in Houdini 18, and exploring anything else you might be interested in, such as vehicle destruction. For those that haven't seen me post before, I'm an FX Lead at DNEG, and previously worked at ILM / Blue Sky / Tippett. Destruction is my specialty, with some highlights including Pacific Rim 2, Transformers, Jurassic World, and Marvel projects. I've also done presentations for SideFX at FMX/SIGGRAPH/etc, which are available on their Vimeo page. If you have any questions, feel free to ask or drop me a message! https://www.cgmasteracademy.com/courses/25-mastering-destruction-in-houdini https://vimeo.com/keithkamholz/cgma-destruction
  8. hey i am new to houdini and i just created something like explosion, and i want to render with a moving camera, so the scene is moving. can i do it? will it take a longer time to render with animated camera? i am afraid that it wont work so mybe someone who has done it before can tell me?
  9. I've start test Houdini 18 and Arnold 6. the first test was simple splines rendering, 250.000 splines instanced 25 times. it loads a 140MB alembic file. rendered in 6 core Xeon CPU and Nvidia Quadro RTX 5000. (windows 10 pro) the startup for Arnold GPU is slow, it renders faster, so it seems but for clear up the final image it takes for forever or just dropped /crashed, hard to tell on the GPU. the CPU is quite fast but much slower then GPU if it ever would finish. (adaptive sampling was on) As soon as Arnold finishes rendering the scene, it stops and do not refresh any more on parameter changes. so far i am not impressed with the Arnold GPU rendering. here is the same scene Arnold CPU with only direct Lighting. (on my MacBook) some test with Arnold GPU. it performed much better with just direct lighting.
  10. I am working with the sea of cloud.It takes me too mach time to rendering it,so I want to render this cloud seperately and composite them by using the DEEP Camera Map,but there is no relationship between clouds,because they are rendering seperately.I want to know if there is a solution to add the shadow to the cloud. secondly ,what's the difference between Deep Shadow Map(DSM) and Deep Camera Map(DCM)?
  11. How can I render my particles with the isotropic volume lighting model and get self shadows? Its like there is no occlusion and I can see my particle field from one way to the other side, and I can't distinguish wich are in front and wich are in the back... Cheers, Diogo
  12. Are there any good resources on rendering particles with Karma? And does it support micropolygon rendering? Thanks
  13. 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.
  14. Hi all, Im exposing a few parameters on a shader within a material builder node. This are things such as spec roughness etc. For some reason they do not have any effect after having added a few. Any pointers?
  15. Hi! I'm trying to figure out how to add a glittery effect to houdini mantra hair. Would I have to build that into the hair shader? If so could anyone giv eme a quick rundown on how to start doing that? The effect I'm going for is like you dipped your hair in glitter water. So the end result is a very sparkly hair. Also I would like to adjust the color of the glitter. Edit: Also I'm generally finding it hard to find a good explanation for how to start adjusting/bulding your own materials.
  16. Friends, I am worried about this effect, I need your advice.
  17. 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.
  18. Hi Everyone, I'm trying to setup a TOPs network to cache out sims with multiple parameters being sent to the dop network. Seemingly basic stuff, however nothing I'm doing seems to be working how I think it's going to work. What I've tried: Using a wedge node to set a random attribute and trying to use that attribute in an exterior dop network - caches into a view able geo rop output but all the wedges were the same Rebuilding the pyro sim purely in the tops network - it makes something but when viewed all the frames appear empty Have the source inside the tops and the dop outside - same result as the first
  19. Anamorphic Lens Squeeze

    I know this is a bit of a bizarre request but I'm trying to simulate rendering in anamorphic squeezed, to later be unsqueezed in comp. I've set up my resolutions and pixel aspect ratio but as expected it just reframes the image and doesn't provide that squeezing effect you might get from something similar to Maya's lens squeeze parameter? Any advice on how to achieve this? Thanks!
  20. gradient r&d

    Hi all, I'm approaching something in H/Redshift which I've not really attempted before - So was interested to see if there were any thoughts surrounding it. Basically I'm trying to recreate the soft/feathered gradient seen in the attached ref image. The inner hard edge I'm planning to achieve with some transformed geo floating above the grid below, however the super subtle feathering is challenging me a little. At first I though of using a simple attribVOP on a grid > point Cd. However I'm nut sure how to achieve the outer feather using that technique... Similarly with an attrib transfer from geo > grid it seems not very feasible to get the extreme feather unless the mesh is crazy high res? I'm continuing to experiment & look through forum threads, but if anyone has some suggestions/tut links/examples etc. would be very much appreciated! (Worth noting system = H17.5.258 & RS 2.6.43) Thanks in advance!
  21. I'm running into an issue. I'm using the convert node to change my wires to NURBS. However, when I render these out it renders them as if the conversion hasn't happened. Is there a good reason as to why this is happening?
  22. Hi all - I've got a TOPS network to render 25 different sim variations at low resolution just to evaluate them. I've stitched together a contact sheet with imagemagick and found a few I'd like to try compositing with. Now I want to render three specific ones with a different ROP setup that's higher resolution/quality. I've tried branching off of my wedge and doing all kinds of things with the map nodes and partition nodes but nothing has worked. Anyone out there know how to do this? Thanks for reading!
  23. 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.
  24. 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?
  25. Hello everyone, I made this tutorial to show a workflow to setup passes for rendering using python. The same can be achieved by the Takes, but I find using python for the task can be quite useful in some cases
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