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Use the coordinates of the vertices.
As ordered sets of numbers - pairs for coordinates in a plane, triplets for coords in 3D space, and so on for higher dimensions.
if three coordinates are sufficient to express the position of motion is called 3d effect
In 3 dimensional space, there are 12 coordinates, although 9 will be enough to determine the rest..
Curvilinear coordinate systems are a means of describing an object/point's position based on angle and distance from the origin. For example, polar coordinates are Curvilinear coordinates for R2 (2D space). Spherical coordinates are Curvilinear coordinates for R3 (3D space) If you need to know more: http://en.wikipedia.org/wiki/Curvilinear_coordinates