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Question by elektamas88 · Mar 26, 2014 at 09:50 AM · c#graphics opengl

Visibility Analysis from point on terrain

I have a c# .net project, and I use OpenGl for drawing. I have lat/lon/alt values in *.csv files, and I load values from them if it needed. I have a 2D map like this:

alt text

Within the circle I would like to know which areas are visible from a given point and also the exact percentage they take of the full area. Actually I want to draw in OpenGl something like this: alt text