In this post, I introduced a hybrid attenuation model that combines contributions to attenuation from distance and elevation. For simplicity, if we "clear the air" at higher elevations, we can simulate the crisp high country views while adding valley haze that increases with distance from the viewer.
Here's another illustration. Here's a view of Copper Mountain with no attenuation. The skyline peaks show a beautiful crispness, but the middle of the image - around the ski area itself - is a bit ho-hum (click for high res image - ~13.3 Mbytes):
This next example includes the hybrid attenuation. The peaks retain most of their crispness while the valley attenuation increases the realism and enhances the 3d feel of the rest of the image (click for high res - ~12.7 Mbytes):
And if you really what to go wild, here's an example with the lower valleys completely obscured by haze (click for high res image - ~8.8 Mbytes):
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