# vertex definition 
vertex 1 xyz 0.0 0.0 0.0 
vertex 2 xyz 1.0 0.0 0.0 
vertex 3 xyz 5.0 0.0 0.0 
vertex 4 xyz 6.0 0.0 0.0 
# definition of curves conecting verteces
curve 1 vertex 1 2 
# definition of circle half 
curve 2 order 4 vertex 2 3 # option 'order 4' corresponds to 2 control points of Bezier curve, 'order 2' corresponds to 1 control point
polygon 1 xyz 1.0 0.0 4.0 weight 0.33333333333333 # coordinates computed according the PDF manual for T3D (page 29) where weight is denoted by \omega
polygon 2 xyz 5.0 0.0 4.0 weight 0.33333333333333
curve 3 vertex 3 4 
