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How do I get faster renders?

DekeDeke Posts: 1,631
in Art Studio

Once my characters stepped away from a window with light coming through, the renders have slowed waaaay down. I've tried pumping up the various lights sources in the set, played with filters, increased ISO and opened the F-stop. Still the renders are not even close to done after 20 min for a single frame. What's the secret sauce of Iray? 

Comments

  • jag11jag11 Posts: 885

    Maybe you'd wanna check this out http://buerobewegt.com/quicktip-rendering-even-faster-in-iray/.

    Also some report improvements by enabling Optix Prime Acceleration. Also make sure you have selected Speed in Intancing Optimization. Play with the max path length if your scene is small.

    And if you have an Nvidia card most of them are overclocked, but you need to enable OC manually.

     

     

  • DekeDeke Posts: 1,631

    Thanks. I am new to the graphics card world so just installed the 680 ftw and it  seems to be running nicely. I've no idea how to overclock it. Would that make a difference? I thought it was all about cuda cores. I'd like to add a second card if that would help, but would have to jerry-rig some sort of extra power source.

  • DekeDeke Posts: 1,631

    Here's an example of my render difficulties, part of a frame. If I were creating Seurat paintings, this would look great, but I'm not.

     

    render sample copy.jpg
    1019 x 650 - 348K
  • jag11jag11 Posts: 885
    Deke said:

    Thanks. I am new to the graphics card world so just installed the 680 ftw and it  seems to be running nicely. I've no idea how to overclock it. Would that make a difference? I thought it was all about cuda cores. I'd like to add a second card if that would help, but would have to jerry-rig some sort of extra power source.

    To overclock it is recommended to use the software provided by your HW vendor, for example with ASUS you have GPUTweak.

    About the difference I have 30% speed increase, verified in the DAZ Studio log file.

    The more CUDA cores you have the faster you can render.

    I suggest to check your DAZ Studio log file out just to make sure there are no errors with your card and also to see DS is actually using you card for rendering in Iray.

  • jag11jag11 Posts: 885
    Deke said:

    Here's an example of my render difficulties, part of a frame. If I were creating Seurat paintings, this would look great, but I'm not.

    I think there is too much light in that scene, seems like even the walls are emitting light. That can cause slow downs. It is always a good idea to convert all materials to Iray material and check no material is emitting lite.

  • mjc1016mjc1016 Posts: 15,001
    jag11 said:
    Deke said:

    Here's an example of my render difficulties, part of a frame. If I were creating Seurat paintings, this would look great, but I'm not.

    I think there is too much light in that scene, seems like even the walls are emitting light. That can cause slow downs. It is always a good idea to convert all materials to Iray material and check no material is emitting lite.

    And if you are using a 'meshlight' (light emitting surface) on purpose and do not need it to emit light in both directions (the face that is towards the camera and the one facing away from it) then make sure 'double sided' is OFF.  That simple step can dramatically speed up a render.

    Another thing to keep in mind...the more simple the light set up, the fewer reflection/shadow/etc calculations are needed...the faster, potentially, it will be.  10 directional lights will probably be a lot slower than 1 directional light and an HDRi.

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