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3Dlight Shaders in Iray

LosingSignalLosingSignal Posts: 409
edited September 2018 in New Users

Seems like a long shot, but does using items that are set for 3Dlight shaders slow Daz down when used in the Iray engine? Like maybe it forces it to use CPU rendering instead of GPU?

Post edited by LosingSignal on

Comments

  • RobotHeadArtRobotHeadArt Posts: 917

    Iray drops from GPU to CPU when it runs out of VRAM.  3DL shaders may not be optimized but it's unlikely that's the cause.  You can always select all the surfaces and apply the Iray uber shader to them to do a one time conversion but you will probably need to make tweaks and other changes to them.

  • LosingSignalLosingSignal Posts: 409
    RobotHeadArt said:

    Iray drops from GPU to CPU when it runs out of VRAM.  3DL shaders may not be optimized but it's unlikely that's the cause.  You can always select all the surfaces and apply the Iray uber shader to them to do a one time conversion but you will probably need to make tweaks and other changes to them.

    So I tried that, but yeah, it didn't make much difference.  I think the extra models (Stonemason's Urban Sprawl 2 for city background) are just dragging the render down.  Durn it.

  • BeeMKayBeeMKay Posts: 7,019

    How much space do you have on your GPU's vRam? It's ususally a texture size problem, and you can reduce that size by using a product like https://www.daz3d.com/scene-optimizer

    especially if you have background elements that will be DOF anyway, or don't need as many details. You could, for example, remove bump and displacement maps, along with normal maps, for any background elements, and reduce the image size by half for the larger image maps.

  • JonnyRayJonnyRay Posts: 1,744
    LosingSignal said:
    RobotHeadArt said:

    Iray drops from GPU to CPU when it runs out of VRAM.  3DL shaders may not be optimized but it's unlikely that's the cause.  You can always select all the surfaces and apply the Iray uber shader to them to do a one time conversion but you will probably need to make tweaks and other changes to them.

    So I tried that, but yeah, it didn't make much difference.  I think the extra models (Stonemason's Urban Sprawl 2 for city background) are just dragging the render down.  Durn it.

    Stonemason's products are awesome. They're also going to be some of the most resource intensive elements you have to render. In addition to Bee's suggestions, if it is truly just a background, could you render the background and foreground separately and composite them afterwards?

  • LosingSignalLosingSignal Posts: 409
    JonnyRay said:
    LosingSignal said:
    RobotHeadArt said:

    Iray drops from GPU to CPU when it runs out of VRAM.  3DL shaders may not be optimized but it's unlikely that's the cause.  You can always select all the surfaces and apply the Iray uber shader to them to do a one time conversion but you will probably need to make tweaks and other changes to them.

    So I tried that, but yeah, it didn't make much difference.  I think the extra models (Stonemason's Urban Sprawl 2 for city background) are just dragging the render down.  Durn it.

    Stonemason's products are awesome. They're also going to be some of the most resource intensive elements you have to render. In addition to Bee's suggestions, if it is truly just a background, could you render the background and foreground separately and composite them afterwards?

    Normally, yes, I could do that, but I'm looking at multiple shots from different camera angles of one scene, comic book style. I'd have to keep reshooting the background over and over.

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