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If you are animating the sun, you can’t use a single file for your Final Gather map. Once you have objects moving or changes in lighting, you need to either calculate for every frame or save out FG maps for each frame (or every other, 3, 5, whatever...) because the lighting solution is changing too much.
In a typical flythrough animation, the lighting stays constant throughout, so using one FG map file works fine. But if your Daylight is changing, the shadows are changing, and where the FG points get mapped to will need to change as well.
FYI, “Interpolate over X frames” has no effect when using Single File. That only comes into play when you generate FG maps for every frame, then have Max interpolate over x frames to reduce flickering. The Max Help files do a so-so job of explaining how it works.
If your render times aren’t insanely high, I’d try letting each frame calculate it’s own FG map and see if there’s any issues with flickering. You may want to bump up the FG settings a little. If that doesn’t work, then look into saving out multiple FG maps and interpolating between them.
3DS Max Design 2011 64-bit - Advantage Pack
Dell Precision T5500, Dual Six Core Xeon X5650 @ 2.67GHz, nVidia Quadro 5000, 24 GB RAM, Win 7 Enterprise 64-bit
Minneapolis, MN, USA
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