Graphics Reference
In-Depth Information
i
, and after being perturbed, it is
N
=
So initially
N
=
i
−
01
j
+
005
k
. Let's compute the angle
between these vectors using the dot product:
cos
−
1
N
·
N
=
N
N
cos
−
1
i
cos
−
1
1
10125
·
i
−
01
j
+
005
k
901
=
=
=
10125
As mentioned above, it is possible to convert the original height field into an offset map
containing the vectors to perturb
N
, thus saving considerable repetitive computation.