Updated Camera, Animation and Frame State (markdown)

2014-11-06 09:31:24 -08:00
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 ## Cameras

 Concepts like "center" and "resolution" only have meaning for 2D top-down views of the map.  As soon as the view tilts the position of the view is different from the position at the center of the viewport, and resolution varies across the viewport. In 3D the position at the center of the viewport could be considered to be the point at which a ray traced from the camera through that pixel intersects the terrain, the surface of the underlying ellipsoid model, or even be undefined if the ray does not intersect the globe (e.g. the camera is pointing at the sky).