Background Image for Physical Sun and Sky?

[djx]

Here is one way of doing it.
http://djx.com.au/cgtalk/sky_with_bgnd/sky_with_bgnd.jpg

The multiplyDivide is there to brighten up the image to account for the exposure node that usually accompanies the sky (and because the gain in the fileTexture is ignored by the mib_lookup_background). The mult value depends on your exposure node; 8000 looked good in my quick test.

You may also want to degamma the fileTexture (depending on exposure gamma)

-- David

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