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cad cad unit1 cad ppt cad unit2 bicubic patches coons patch surface patch boundary representation b-rep constructive solid geometry solid modeling csg hermite curve b- spline curve bézier curve geometric modeling anna university two marks important 2 marks computer aided design me6501 scaling reflection line drawing cohen sutherland clipping algorithm clippin product cycle 3d transformation 2d dda dda algorithm bresenham's algorithm computer graphics