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Modelling and Rendering a surface
Common practice in modelling and rendering a surface is to approximate it by a polygonal surface. By a polygonal surface we mean a surface which is made up of polygons. Main reason for converting a surface to a polygonal surface is to simplify representation for speeding up the surface rendering. This is possible as all the polygons are described by linear equations.
To find out average unit normal vector at each polygon vertex At each polygon vertex as demonstrated by point V in the figure above, the normal vector is acquired by averaging
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properties that helps in reducing efforts
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