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malexander

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malexander last won the day on February 7

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About malexander

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    Houdini Master
  • Birthday 03/06/1974

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    sidefx.com

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    Mark Alexander
  1. Assemble creates Packed Fragment primitives, while Pack just creates Packed Primitives. A Packed Fragment refers to a portion of an underlying shared geometry. In this case, all the packed fragments will refer to the same geometry, just different parts of it. The viewport can then draw this as a single mesh. But when you pack to Packed Primitives, the parts of the geometry you are packing from are extracted into new geometry for each packed prim. When the viewport goes to draw this it sees 7000 separate meshes. This takes much longer to draw as the overhead of sending 7000 batches is a long higher than sending a single batch. It's this overhead that slows things down a lot.
  2. Set Display Options in Python

    "Faded" may not exactly what you think it is. It just suppresses geometry color on the model. "DisplayModel" also only affects the geometry of displayed SOP when inside a SOP network. Are you looking for the ghosted look instead?
  3. If you manually install the driver, it compiles the kernel module for you. It's important to make sure it's using the same gcc version as the one used to compile the kernel itself. You can set the environment variables CC (to gcc) and CXX (to g++) to specify the proper gcc versions before installing the driver with the NVIDIA_...sh script.
  4. Disabling Texture Wrap in UVQuickshade

    The Decal SHOP will gives you a material which has a texture that doesn't wrap. Create one in a Shopnet, then use a Material SOP after the UVQuickshade to assign it,
  5. Yes, you can do that. The Envelope CHOP is useful to extract a much lower frequency curve from the volume, while the Pitch CHOP can be used to extract the dominate pitch of the audio. You can use either (or both) to affect the object. Instead of using noise, substitute a FIle CHOP and load your audio through that. Then use the Envelope or Pitch CHOP to filter it. You will likely need to scale or smooth the channels to get the animation results you're looking for.
  6. Background image

    It's greyed out because the camera is currently defining the background image. If you lock the view to the camera then it'll enable these options, and any changes you make will be applied to the camera Background Image parameter.
  7. Rendering Normal Maps?

    You probably need to flip the green channel (1.0 - G). There's 2 styles of normal maps, GL and DirectX, due to the fact that window Y=0 is at the bottom in GL, and the top in DirectX (matching X11 and Win conventions).
  8. Is AMD potentially risky? (Threadripper)

    I think it's worth noting that any new CPU architecture is inherently risky. AMD's offering has NUMA issues and Intel's heat issues (due to poor packaging of the heat spreader). If you have any issues, I'd suggest dialing back any overclocks. Rendering a sim or sequence isn't any faster if it crashes midway through.
  9. Compositing- increase canvas area

    Yep, Window COP. Also, the Border COP will give you some additonal options about how you want that area filled, if you need that.
  10. Controlling Focus Distance

    You can also use an Object CHOP to get the distance between two objects, then put a chop() expression in the focus parameter to fetch the result.
  11. How to set alpha channel with function

    Channel Copy with the following settings will copy the luminance to A and set C to black: Target: New Plane: A Source: Input 1: C Target: C Source: Set to 0 (black)
  12. Is AMD potentially risky? (Threadripper)

    Another Houdini user submitted a bug to SideFX and managed to resolve it himself, and the bug happened to catch my eye. Similar setup to yours.
  13. Is AMD potentially risky? (Threadripper)

    Someone found that turning off "Core Performance Boost" in the MSI x399 BIOS fixed crashes for them. Having no experience with that motherboard I don't know where that setting is, though.
  14. Is AMD potentially risky? (Threadripper)

    Higher RAM speeds do increase performance slightly. It's worth getting if the markup on the price is <10%, but that's rarely the case. Also it's harder to get fast RAM in large DIMM packs that you'd need to populate all the slots (4-8). If you have to choose, always go for more RAM over faster RAM. You can see the effect of RAM speed, and NUMA, in the first page of this article: http://www.anandtech.com/show/11726/retesting-amd-ryzen-threadrippers-game-mode-halving-cores-for-more-performance
  15. Take the 1080Ti. You won't regret it. The iMac, on the other hand.... (^^^)
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