From: Nick V. <ni...@ev...> - 2011-06-04 11:45:09
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I have a small problem which I suspect can be solved in an easy and elegant way, and it is simply lack of sleep/stupidity preventing me from finding it. I have a number of line drawings comprised of cartesian points. I need to project them onto a sphere (they are drawings of constellations, so I need to project them onto an imaginary celestial sphere) and convert the points into sphercal co-ordinates. I *can* map the points to a sphere, that's no problem. But obviously, when I do this they become distorted. What I want to do is find out what the points should be to get an undistorted view - i.e the mapping that will produce a projection so the points match the cartesian version. Obviously, I realise this depends on the projection used etc, but basically, a small amount of distortion is fine. I am sure there must be a simple way to achieve this, but I can't seem to manage it. --- Nick Veitch |