27.4.2 Half lines in space
See Section
26.6.2
for half-lines in the plane.
The
half_line
command creates rays.
half_line
take two arguments:
P
,
Q
, two points (which can also be given as a list).
half_line(
P
,
Q
)
returns and draws the ray from
P
through
Q
Example
half_line
(
point
(0,0,0),
point
(1,1,1))
