Game Development Reference
In-Depth Information
Objective complete - mini debriefing
What we have done here is created the waypoint system that basically controls the move-
ment of the enemy. We started by creating the
Waypoint
script, which gets the
showPath
and
radius
variable from the
WaypointsContainer
script. Then, we used those variables
to show the gizmo objects, which are the icons and wire spheres in the
OnDrawGiz-
mos()
function.
Next, we created the
WaypointsContainer
script that has all the necessary code to
control the enemy movement. First, we have the
AwayFromWayPoint()
function that
will check the distance between the enemy's current position to the next waypoint. In this
function, we've used
myVector3
.
sqrMagnitude
to check for the distance. If we take a
look at the Unity documentation, we can also use
Vector3.Distance()
or
myVect-
or3.magnitude
to check for the distance between two positions. So, why did we use
sqrMagnitude
instead of others?
Let's take a close look at the equation of the
Vector3.Distance()
function:
Vector3 vector = new Vector3 (a.x - b.x, a.y - b.y, a.z -
b.z);
float distance = Math.Sqrt(vector.x* vector.x+ vector.y*
vector.y+ vector.z* vector.z);
As we can see, we need to find the difference between two vectors first, use the power of 2
to the result vector, and square root it.
Note
The difference between two vectors is the vector from the tail of the base vector to the head
of the reverse of another vector. Then, the root of the square is just to calculate the mag-
nitude of this vector.
Assuming
myVector3
is the difference between vectors,
a
and
b
like the
vector
para-
meter in the preceding script, then the following is the equation of
myVect-
or.magnitude
:
float magnitude = Mathf.Sqrt(myVector.x* myVector.x+
myVector.y* myVector.y+ myVector.z* myVector.z);
