t
=
0.00
0
1
}
start & end points
r
0
=
⟨
3
,
−
2
,
4
⟩
,
r
1
=
⟨
2
,
4
,
−
1
⟩
r
(
t
)
=
(
1
−
t
)
r
0
+
t
r
1
,
0
≤
t
≤
1
You can think of
t
as giving a percentage, namely the percentage
r
(
t
)
has moved away from
r
0
and towards
r
1
.
When
t
=
0.00
,
r
(
t
)
is
100%
towards
r
0
and
0%
towards
r
1
.