circle  

r::§Length → §Path  
Dynamic references:  none 
Construct circle in 2^{d} space, of radius r, centered at the origin.
The circle is approximated using four spline segments, and for positive radii, it encircles the origin counterclockwise, starting on the positive x axis.
Use ..Shapes..Geometry3D..immerse and ..Shapes..Geometry3D..rotate to take the circle into 3^{d} space.

ccw_arc  

z0::§Coords zStart::§Coords zEnd::§Coords r::§Length → §Path  
Dynamic references:  none 
Construct circular arc with counterclockwise direction.
The center point of the circle is z0, and the radius of the arc is r. The arc starts on the ray from z0 to zStart, and ends on the ray from z0 to zEnd.
See also cw_arc.
