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Calculate shadow cross section #205

Open GoogleCodeExporter opened 9 years ago

GoogleCodeExporter commented 9 years ago 
Aleksey Malinka proposed that it would be convenient for users if ADDA 
calculated geometric shadow cross section. In particular, it can be used to 
calculate efficiencies (extinction etc.), which would follow the definition of 
Bohren & Huffman (currently ADDA uses volume-equivalent spherical cross 
section).

Such algorithm is straightforward for compact particles, however ADDA knows the 
shape only by a set of dipoles. Hence, the algorithm should work directly with 
dipoles. The ambiguity is then with the shape of the dipole - cubical or 
spherical ones (presumably equi-volume) will result in slightly different 
answer (consider, e.g., sparse fractal aggregates).

Original issue reported on code.google.com by yurkin on 9 Dec 2014 at 8:25