## Kernel::ConstructDirection_3

A model for this must provide:

Kernel::Direction_3
| fo.operator() ( Kernel::Vector_3 v)
|  | introduces a direction initialised with the direction of vector v.
Kernel::Direction_3
| fo.operator() ( Kernel::Line_3 l)
|  | introduces the direction of line l.
Kernel::Direction_3
| fo.operator() ( Kernel::Ray_3 r)
|  | introduces the direction of ray r.
Kernel::Direction_3
| fo.operator() ( Kernel::Segment_3 s)
|  | introduces the direction of segment s.

### Refines

AdaptableFunctor (with one argument)

### See Also

CGAL::Direction_3<Kernel>