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johnLIC last won the day on November 15 2016

johnLIC had the most liked content!

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About johnLIC

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  1. I want to use the u or v tangents of a NURBS surface in an attribute wrangle node. What are the names for the tangents? Well, I found the polyFrame node. It doesn't play nice with NURBses, not surprisingly, but if I switch to poly geo I get some tangents. I still want to know how to access the tangents of a NURBS surface, but at least I'm back in business now...
  2. pyro dust with camera move

    Thanks! My Nvidia GTX 970 has 4GB of GPU RAM. In that demo file I can crank the Uniform Divisions on the smoke object to 210 before the smoke solver stops working. That gets me 9,600,000 voxels. I'm using about 27 million voxels before I get a decent render. Maybe I can split the space up into smaller chunks....
  3. pyro dust with camera move

    Does anyone have general advice for a long shot with a huge zoom out/pull back? I'm trying to create some lingering dust. I can simulate at high enough resolution to get a decent rendered look when the camera is pulled back and we see the whole sim, but I've got almost 200 frames at the beginning of this shot where the camera is zoomed in and looking at a small section of the sim. That part doesn't look like much right now. Is there any alternative to simming a whole dining room with 3 mm voxels? Any advice on slow moving, lingering smoke?
  4. Flip fluid "noise"

    Or model the deforming tornado whirlpool shape ( maybe in NURBS so the tangents can drive the vel?), and sim on top of it?
  5. pyro render times in render view vs. mantra

    Well, openGL is not as pretty as the renderview images, so I kept looking, and found this awesome script: https://github.com/ArthurYidi/Houdini-Quick-IPR-Preview Here are complete instructions, not long, but maybe not intuitive for everyone... I put the two .py files in this directory, then restarted Houdini: /opt/hfs16.0/houdini/python2.7libs I imported the new modules in a Python shell in Houdini: import tiff import renderIPR This script needs to know the name of your Render View. In the Python Shell I did this: p = hou.ui.paneTabs() print p and then inspected the contents of p manually (well, with my eyes, so... visually?). In my case the Render View pane was p[3], like this: <hou.IPRViewer panetab3>. Knowing the name of the Render View pane, I created an IPR object, as defined in the file renderIPR.py. I named it J: J = renderIPR.IPR(p[3]) I set the frame range for a quick test: J.setFrameRange(0,10,1) The first time I tried: J.render() it failed saying invalid plane. It was looking for the color plane in the Render View, but I hadn't rendered anything yet. I rendered one frame with the "render" button in the UI, then tried: J.render() again, and it worked! It made a render directory and dumped 10 frames in there. I hope this is helpful to anyone wanting to save out a render view frame sequence.
  6. pyro render times in render view vs. mantra

    Thanks! This is great!
  7. pyro render times in render view vs. mantra

    Yeah, I guess you're right. I can't even get a crappy frame out in under 15 minutes. Does anyone have a script that will render a frame in the renderview, write it out to disk, and then advance to the next frame? I don't have 300 CPU hours available, and I really could use the renderview frames, at least for now. I'm looking at a list of Python commands now....
  8. I have a cached pyro sim I'm trying to render. When I render a test frame in the render view panel it takes about a minute. That's using the mantra node, without preview on, using micropolygons, with 2 pixel samples, noise level = 5, and other stuff turned down for fast rendering. I clicked "render to disk in background" and it's been running for 32 minutes, and doesn't seem like it's going to stop any time soon. This is a fresh mantra node. The previous one was just as bad. I've got two 2048x2048 depth maps for shadows. Could that be the problem? I'm stumped, but I've got 600+ frames to render, so any help appreciated.
  9. ocean spectrum questions

    The chop needs to be tuned according to the scale ("ampscale"). At lower scales it takes more chop to get peaks.
  10. ocean spectrum questions

    I'm having a go at it, but downsampling 3 or 4 results in that quilted, square patches look. I'm just having a hard time imagining how it's going to work conceptually. If I could gamma the map so the high values are higher, that might make the waves crisper, but I'm not sure how to do that between the ocean spectrum and the ocean evaluate. I'd like to do it to the output .exr map in Nuke, but my non-commercial license only outputs 1920x1080...
  11. ocean spectrum questions

    I'm trying to make an ocean surface about 10 meters across, with a quiet feel. I'm having trouble making waves that have peaks without a lot of higher frequency displacement. How can I get waves that are peaked but not lumpy? I need to export displacement maps to be rendered outside of Houdini, so I don't have the advantage of the Houdini ocean shader. I think I've got enough resolution in my maps (3000 x 3000). When I try to filter out the lumps I lose the peaks and it looks like a rubber sheet.
  12. FX TD available

  13. Alembic Export Houdini Indie

    Can anyone confirm that Indie will allow Alembic export?
  14. sand disintegration

    Did you ever figure out a good way to do this?
  15. pyro question

    I'm not sure if this is the problem you're trying to solve, but the emitter works if you turn off the gasresizefluiddynamic1 node. You can give the emission a chance to start by setting the Delay Frames to something like 10. I would also make the initial pyro box bigger. Delaying, and increasing the pyro size both give the resize node a chance to sense some density before collapsing the pyro box on itself, if that makes sense. There's also something weird going on with the timeline for me. If I step through manually I can see the sim, but if I press play I end up at frame 2.63, 3.63 etc, and there is no density to see in the viewport. ???