perspective projections

perspective projections

perspective projections
A typical perspective grid superimposed on a photograph.
perspective projections
In the above perspective projection, the light source is at north pole; it projects the meridians and parallels onto a plane tangential at the south pole.
The projections in which the shadows cast by the meridians and the parallels of latitude of a transparent model of the earth are drawn onto a plane surface. When the relationship is such that simple nongeometric construction is impossible, a nonperspective projection is used. The majority of map projections are nonperspective.
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The currently available graphics cards are fine tuned to rapidly render perspective projections and handle several million polygons per second.