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Differences in GI brightness on certain machines

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  • Differences in GI brightness on certain machines

    Working on a scene all day yesterday, got it looking nice. Then every other machine I send it to render on seems to render it with 100x the GI and a little bit brighter too.

    You can see whats happening on this render - I did it with DR to check that it was making the gi brighter and not just the gamma.



    I've narrowed it down to the vray sky in my environment - all the vray lights render fine, it's just an env issue. There are a couple of windows I needed to ramp it way up to get light coming through.

    I've checked the gamma, merged it into a new scene, deleted all the lights and swapped out the sky. Same thing - locally it renders fine and on everything else it does that. If I open the scene on one of those other machines and render it locally it does this too.


    What I think is happening is that locally on my machine, vray sees the model as watertight and only lets the env in through the windows, but on all the other machines the GI leaks in all over the place.

    Any ideas how to fix it? I know I can model around it but the fact it's only doing this on some machines makes me want to shy away from a cheat and fix it properly.


    I'm on a core 2 quad, the rendernodes are on i7's. Same amount of ram, same setup.

    edit: with no GI theres still some difference actually - it's very subtle, just colours in materials getting darker/brighter. I think it may be making some surfaces more reflective or less glossy too. This is properly mental.
    Last edited by Neilg; 20-07-2011, 02:57 AM.


  • #2
    Environment light turned off, one vray light, IRmap & LC. Doesnt matter which gi method I use though.



    This is a mess. It's flipping normals, bending surfaces (smoothing issue?) and making some parts more reflective. If I flip the normals of the RH face on local, then it just swaps the effect over. They're always different.
    What on earth is going on with this scene and how do I fix it?
    Last edited by Neilg; 20-07-2011, 03:25 AM.

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    • #3
      It's on it's way to being solved. Sometimes npower nurbs aren't good enough on the highest setting, and you've got to ramp up the density even further and convert it to an edit poly.

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      • #4
        So was it a power nurbs issue in the end?

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

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        • #5
          Yes - not sure what it was doing to the geometry to make that happen, but tesselating it an awful lot and converting to edit poly fixed it. Made it a bit awkward to work with but at least it renders.

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          • #6
            We are having weird issues with powernurbs too, randomly choosing to not render certain objects which display fine in viewport. Converting to mesh sorts it also.

            Why does these things always happen when you are up against it!
            chris
            www.arc-media.co.uk

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            • #7
              Originally posted by chrisjacks21 View Post
              Why does these things always happen when you are up against it!
              3 weeks work, full run and no problems... then on a quick 2 day extra image last minute before the deadline I manage to find some issues i've never even seen before. It's almost like it does it on purpose.

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