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Prof. Kyushik Oh (http://www.casa.ucl.ac.uk/news/pages/Kyushik.html) did show me an AUTOCAD solution last year which did visibility analysis for Planning Process, but it didn't make a visibility graph but more sort of rendering 3D vistas. I think I have found a link to the lab of Prof. Lee but its all in Korean.. http://lacomi.uos.ac.kr/gislab/index.htm We need a translation here :) Sanjay.