Sack Library Documentation
sack::math::vector::SetRay Macro
#define SetRay( pr1, pr2 ) { SetPoint( (pr1)->o, (pr2)->o ),  \
                             SetPoint( (pr1)->n, (pr2)->n ); }

copies the value of a ray into another ray

RAY ray;
RAY ray2;
// set ray to ray2
SetRay( ray, ray2 );
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