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Lense Effects and saving .vrimg or .exr from the vray frame buffer

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  • Lense Effects and saving .vrimg or .exr from the vray frame buffer

    Hi Everyone

    I've recently taken interest in those fancy new Vray Lens Effects, but have run into a problem/limitation when saving to my studio's preferred .vrimg or .exr multi channel images.
    The special passes for the Vray Lens effects are not being saved through the Vray raw image file saver, and the effect is not showing up in the main RGB channel of the image either. It seems the post effect is performed after the raw images are finished saving.
    Using the advanced max .exr saver to get the Vray channels isn't much better, because it doesn't grab the Lens Effects specific passes, perhaps since they're not technically on Max's Render Elements list. It does at least save the post effect to the saved image's main RGB channel.
    It is possible to save out the Lens Effects using vray's Split render channels saver, but the pile of files that makes is rather unpleasant for our compositors, so we'd like to avoid that if possible. We can also use a quick second render using the split channels as a work around to just get the effect, but work arounds and extra renders are obviously not preferable.
    Any one else run into this? Is this just a common issue with render effects that I'm just now noticing because I've never used them since I started running multi channel images into Nuke? Is this just a new bug? Am I missing an obvious fix (quite possible)?

    Thanks everyone!

  • #2
    This is currently a limitation of the way .vrimg and multi-channel .exr files are written. Since the lens effect is a post effect, it works on the entire image once the rendering is complete. However, .vrimg and .exr files are written while the render itself progresses, when render effects are not yet calculated.

    This will be fixed in the service pack.

    Best regards,
    Vlado
    Last edited by vlado; 25-01-2011, 11:44 AM.
    I only act like I know everything, Rogers.

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    • #3
      That makes perfect sense. Thanks a bunch Vlado!

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      • #4
        Vlado,
        has this been fixed in the latest SP?
        the lens effects layers are not saved within the EXR
        or am i missing some important button?
        Thanks for info
        Best Regards
        Martin
        http://www.pixelbox.cz

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        • #5
          nothing has changed, its still a post process
          Kind Regards,
          Morne

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          • #6
            This issue should really be fixed. I also save out as EXRs and I like the results I get when I use VRay Lens Effect but I can't save it So was it fixed in the Service Pack or am I missing something?

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            • #7
              It is not changed for V-Ray 2.10, but we are definitely thinking for a work-around for the next update.

              Best regards,
              Vlado
              I only act like I know everything, Rogers.

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              • #8
                This is an old thread but the issue is still there. The glare channel is written to the raw file but the effect is different when saving an 8bit image. A lot of this effect goes missing in the process. When saving to jpg/png I got very nice chromatic abberation and lens dust effects with a lens flare but what I got when compositing it back from the raw output is far from this effect. Is it something that will still be taken care of?
                makebelievegraphics.com

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                • #9
                  Originally posted by kubbek View Post
                  This is an old thread but the issue is still there. The glare channel is written to the raw file but the effect is different when saving an 8bit image. A lot of this effect goes missing in the process. When saving to jpg/png I got very nice chromatic abberation and lens dust effects with a lens flare but what I got when compositing it back from the raw output is far from this effect. Is it something that will still be taken care of?
                  Send your scene via the contact form and we'll troubleshoot it.
                  Aleksandar Hadzhiev | chaos.com
                  Chaos Support Representative | contact us

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