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objects super dark behind a glass material

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  • objects super dark behind a glass material

    I'm trying to render out an animation which has fruit inside a glass cup with a beer being poured into it. (I thought it would be a quick and easy animation... I don't know why I thought this).
    Anyway when I render it all out on CPU it works great! and comes out looking like this:



    However I've been trying to render more and more with my GPU lately since I spent all this money on an RTX 3080, and it works AMAZING it's so fast! but unfortunately the fruit inside the glass comes out super super dark. Like it's not receiving any light whatsoever.



    I've tried so much to get it to work properly:
    I've changed the trace depth both global and per-material all the way up to 25, nothing
    turned off shadows for both the glass and turned off receive shadows for the fruit
    turned on and off "affect shadows" on the glass material
    turned light cache sample size up and down
    turned the glasses fog color up to pure white and then back down to where it was
    changed the fog depth to 1cm
    turned the "affect all channels" thing on and off
    none of these have changed the outcome at all. the only thing that does make it look right is hiding the glass altogether:


    This has all been very frustrating because I would love nothing more than to hit render right now and shove this entire animation out at 2 minutes a frame. As opposed to the 5 hours a frame it is currently taking on CPU.
    Any help would be greatly appreciated.
    Last edited by reece_schultz; 06-05-2021, 09:09 AM.

  • #2
    what cpu do you have that is 2mins on gpu and 5 hrs on cpu?
    Website
    https://mangobeard.com/
    Behance
    https://www.behance.net/seandunderdale

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    • #3
      Originally posted by seandunderdale View Post
      what cpu do you have that is 2mins on gpu and 5 hrs on cpu?
      2x XEON X5650s. My 2 render nodes are super old.

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      • #4
        Hi reece_schultz,

        Since you mentioned you've tried some things which gave no result, would it be possible to forward us the scene in question so we can troubleshoot? You can send it via our contact form, just make sure to mention this thread (or my name) in the email. Thanks!
        Nikoleta Garkova | chaos.com

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