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Concept 3.2d : Drawing a LineLoop in 3D Space
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Idea:
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OpenGL provides GL_LINE_LOOP to render a line 
loop. A call to glBegin(GL_LINE_LOOP) does the
following:
Draws a line segment from Vo to V1, then from
V1 to V2 and so on, finally drawing the segment 
from Vn-1 to Vn.  Thus a total of n segments
are drawn.