Ken


Thanks very much for the suggestions. I've done some more 
tinkering around with the settings and the results are much 
more encouraging. However the settings are want to control in 
relation to the real sun are its vertical and horizontal position in 
the sky (ie x,y,z). Your settings gave a range of 5-15degrees for 
the angle of elevation, which were a touch on the dark side; I 
changed this to give an elevation of 35degrees (300,350,-500) 
and the results look quite close to a real image given an 
elevation angle of ~10degrees. Do you have any suggestions 
for "correcting" this?

If it is useful I have put the tga file on my website 
(http://www.geocities.com/Yosemite/Rapids/5855/tga.zip); 
both this and the sample image should have a pixel resolution 
of ~30m, so they are comparable.

Cheers

Mike

PS If the image is automatically scaled between 0 and 1 on all 
three axes, sun position y=54 makes it 54 times higher than the 
maximum height??

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