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Found 85 results

  1. Check out the new tutorial about creating explosion with pyrofx in Houdini. https://www.cgcircuit.com/course/explosion
  2. 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!
  3. 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.
  4. 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
  5. 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?
  6. noob query: anyone knows why this is happening (please refer to picture) thanks in advance m.
  7. Hello Everyone, This is a fairly long introduction to Arnold in Houdini.
  8. Hi guys, I use Houdini apprentice v 15 and I wanted to render RBD as phantom but nothing works. And i need your help to fix the issue. On the first picture file_kitchen there is the phantom option and it works when i do a render. The second example is different when i select the dinner plate there is no phantom option like on the first picture. In the render visibility section i chose the phantom option and the dinner plate is still visible. Does someone know how to fix this ? Thanks you all.
  9. light

    Hey everyone, I'm working on the scene of water effect. I project a texture (.exr format) that there are few spot lights on the image to a grid card through a constant shader, in order to catch the reflection from the projected lights on ocean wave's surface and big spray ( created by millions particles), and there are 4 lights ( envlight, 3 other lights ) in the scene. Then, I render the wave and spray all together. For the moment, the passes I use are: color(RGB), normal, all_emission ( created by Mantra- Extra Image Planes- click " Combined Emission"), depth of field, id. I could do some adjustments in Nuke by using those passes. the lights on the card are reflected on both wave and spray very well on the color(RGB) pass. But on the all emission pass, the lights from projected card are only reflected and restored on wave surface, not on the big spray ( particles). So I couldn't grade them down and up by using this pass. I tried to assign the wave's material to the big spray ( particles ) , it still doesn't work. Does anybody have the same situation, and how can I solve the issue ? I know that I could use other method to grade separately in comp, however, I would like to know the reason. Thanks very much!
  10. Hello Everyone, This is a series of videos on how to use the Redshift renderer in Houdini regards Rohan Dalvi
  11. Hi all, I'm trying to render to several outputs at the same time, and perform multiple takes on those outputs. In the example scene shows more clearly what I mean, I have two sub-takes (each shows a different primitive), and a Wedge node that is set to render both of these takes. In the /out you will see a Wren node plugged into a Mantra node, the idea being that if I set the Wedge node to render using the Mantra node as an output driver, the Wren node that is connected into it should also render. But it renders using the wrong take. If you open the attached file and click on 'Render Wedges' of the /out/wedge1 node it should render the Wren node, then the Mantra node to MPlay. You can see that the Wren node always renders the same output. I see in the documentation there are instructions on how to wire up multiple nodes to make them all render in sequence, but this doesn't seem to work at all where takes are concerned. Am I doing something wrong or is this a bug? Wedge.hipnc
  12. I have a question that has been bugging me for some time and I couldn't find much information about it. Which is the best and most efficient way to render many polygons? Using delayed load procedurals or using packed disk primitives? Or, am I confused and are they both doing the same thing and there's no difference between the 2 workflows? As far as I know, they both create instance geometry. The documentation doesn't help much either, half of the things I read talk bout optimizing a render using delayed load procedurals, and the other half about using packed primitives. I'm wondering if packed primitives is the new workflow and using delayed load procedurals was the old way of doing it as is now obsolete? Here are the 2 workflows I'm talking about: Packed Disk Primitives Here I pack all my geometry and write it out to disk. I then load it back and change the load setting to "Packed Disk Primitives". Then I generate my IFDs and they are now referencing the geometry from disk instead of having to write them out (And the IFDs are a few KB or MB big). I then render using those IFDs. Here is what the documentation says about it: "Packed Primitives express a procedure to generate geometry at render time." "Because Packed Disk Primitives by their nature are geometry streamed from a file, similar to Alembic primitives, we don’t have to use a special procedural to get smaller IFDs." Delayed Load Procedurals Here I write out my geometry (not packed) as bgeo and then make a Delayed Load Procedural shader and select the bgeo files I just wrote to disk. I then go to the Rendering -> Geometry tab of my object and load my Procedural Shader. I then create my IFDs and then render them out. In the documentation about the delayed load procedurals, it talks about optimizing geometry this way. So I know there are these 2 ways, but are they both equally the same, or is one of them better than the other? Which workflow do you use? Also, when using the packed disk primitives, if the geometry you want to render is unique and it can't be instanced (or there's just no point in doing it), do you still pack it (so its only 1 packed prim) and save it out? Or do you use the delayed load procedurals? Do you use any other workflow? Any advice on this would be greatly appreciated! Thanks
  13. Hi, We started using deep rendering and noticed nuke scripts literally explodes if we forgot to check "Exclude from DCM" for each extra passes. My problem is, how do we exclude base components from DCM, like Direct Lighting and Indirect Lighting? There is no Exclude from DCM checkbox for those passes. I tried in H14 and H15. Do I need to manually export those passes in the Extra Image Planes section? Thanks Maxime
  14. hi every one, whenever i pick a color from the final render i got this weird result , some times it's slightly bigger and other it's lower , i'm using default value in houdini didn't change any things in render or linear workflow any idea ?
  15. Hey all, I've cached out a cloth sim that's was attached to a static object but when I read it back in with a file node the geometry jumps around in some frames. In the sim in the DOP net it's fine but in the cache it jumps around. Anyone know what's happening?
  16. Hello guys! I'm some kind of a newbie to Houdini but not really in the 3D field. I would like to have some feedback and your opinion on my ocean shader. It's a simple scene which will be animated with a camera traveling toward the horizon, I use it to learn more about houdini ocean shader. Here's my shot : It's been few days I'm struggling with this one, so any feedback is more than welcome! Thank you guys, have a nice day.
  17. Hello guys, Here is my problem, I just finished building my shader for the ocean. When I watch the animation using the viewport everything is working like a charm, When I'm rendering the animation using the ocean_preview node in mantra, everything is working like a charm. However when I try to render using the ocean_render node or the ocean_render_export_maps, the animation is not rendering, only the frame 1 is rendering and it keeps the exact same frame for all the next. Can you tell me what is wrong ? The only way to make it work is by moving to the frame 2 and render the displacement from the current frame of the ocean_render_export_maps and then rendering the current frame using mantra. Should I render the whole animation using this process ? I need to render using the ocean_render1 to keep the infinite ocean which is connected to the grid1. Thank you guys, I really need help on this one
  18. Hello! I'm kind of new to Houdini and when I save a frame in mantra ( file > save fram as... ) it doesn't keep the real color which are displayed in my mantra render. I tried TIFF, TGA, JPEG 100% and nothing worked, colors are still different from the one coming out of my mantra render.. Any idea how to keep the exact same color ? Need help, have a nice day guys! Fay
  19. I would really appreciate help with doing the simplest possible volume render using RenderMan in Houdini. I always just get a black image. I think my issue is that I don't know how to set up a volume shader... A sample .hip file, or just telling me which nodes to use, would be very appreciated.
  20. Hi everyone, I seeking workflow tips to render characters separately from the environment but still have all the interactions such as reflections, shadows and so forth in both layers. Any tips and ideas would be much appreciated as I'm working on a project which would benefit greatly from this technique in comp. Thanks in advance.
  21. As a novice I can quickly see what a HUGE amount of time might be spent iteratively tweaking the various settings in Mantra Surface materials to get just the right look. In addition to what is installed by default, is anyone aware of any 3rd party libraries of material settings for Mantra Surfaces?
  22. Hey Guys! In a recent demo vid on how Houdini can be used in games, they showed how ocean fx can be used to create normal maps for fluid. at 7:46 I'm just wondering, how do I render the normal map? So far, I unwrapped my grid, and used polyframe to get my normal, tangent and bitangent. But I'm unsure on how to get the colour to reflect the correct values. From a lot of reading, it looks like I have to orient my current normal to turn it into tangent space? I've given it a guess, but it doesn't look right. My next step is then how do I bring this into COPS (what it looks like he's using) to save the normal map out? Thanks a lot! fluid_texture_02_HALP.hipnc
  23. Hello all, I was wondering if anyone has any experience working with Infiniband and Houdini. I have recently purchased two Voltaire HCA700ex2-q Infiniband cards (40Gb/ps) and have them connected via a Mellanox 40Gb capable fiber qsfp+ cable. I've already upgraded the firmware on both cards to the newest available version. And both cards can see each other and I am able to set up and transfer files between them using shared drives in Windows 7 Professional x64. (I will be trying this next in CentOS 7) What my question is: how do I get the two computers to see each other in Hqueue so that I can use my faster Infiniband connection rather than my much slower gigabit Ethernet connection which is getting fully saturated during distributed fluid sims. Do I need to edit the client information in some way to use the IP from the Infiniband card (cards are capable of 10Gb/ps IPoIB)? Thanks, Ryan
  24. Our new GridMarkets Simulation and Render Submission tutorial is out! Our new video tutorial describes how to submit a Houdini render or simulation to GridMarkets. A sample .hip file can be found at the bottom of the following page to help you to get started: How to submit a render or simulation to GridMarkets
  25. Hi everyone. First post here and new houdini user, so be gentle! I'm trying to understand how one might go about adjusting an HDR within Houdini rather than adjust in another DCC and reload in Houdini. I tried loading the HDR in to /img/ then adjusting with a color-correct before loading in to the mantra environment light using an "op:" path, but this introduced a painful delay as houdini seems to "cook" all too often even when as far as I would assume, the HDR doesn't need colour corrected until render-time, and even then, only on a per-pixel basis during render. So, I assume I am approaching this from a totally non-houdini way of thinking. The options as I see them are 1) Adjust the HDR in a different application. 2) Adjust the HDR in the environment light by adjusting the color tint values. 3) Adjust the HDR in the /img/ context and save out with a ROP when satisfied with the result and then pass the direct path to this saved file to the environment light (rather than pathing to the file-in node within \img). 4) Access the file-in node within the environment-light and add a color-correction in there (although when I open the environment light node network, there is no sign of the file-in as one would expect or as you can find in a standard mantra shader node network). So, I guess my question is, where I have a 'map' in houdini, what is the best way to colour correct the map either by processing outside the object or inside the object node network? (where 'object' could mean primitive/light/shader/etc). Thanks