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paulc

Aerial Perspective

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Having been inspired by the recent (and not so recent)sky rendering threads I''ve been researching the various aspects (e.g. implemented skybox a while back, then saw these threads. Eek. ). I''m in the process of implementing a gradiated sky dome and have been looking at the theory for aerial perspective. Having looked at a number of papers including the preetham one, the paper and demo on the ATI developer website seem to be the best source of implementation detail. At the end of the ATI paper there is an implementation note that details the simplified version of the equations used in the demo. The thing I''m currently stuck with is the three parameters, the Rayleigh coefficient, the Mie coefficient and the Henyey/Greenstein phase function eccentricity. There are references in the paper that look like they represent these values, but I have yet to convince myself I''m interpreting things correctly. Same with the Preetham paper, there are values/functions that may be what I''m looking for but the notation is sufficiently different to make me unsure. If anyway could give a pointer as to the correct functions/constants/whatever that would be very helpful. (bit rushed at the moment, will come back later and add some links/clarification if needed).

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