Hi there Sagers:
I'm trying to use a cartographic projection $f:\mathbb{R}^2\to S^2\subset\mathbb{R}^3$ to map Sage 2D graphics objects onto the sphere $S^2$. Projecting points is easy, but how can i project polygons or function plots? Do i somehow grab the graphics object points and use point3d and $f$?
Thanks for your attention. Alex
