Game Development Reference
In-Depth Information
// Set the initial camera matrix
ComputeMatrix()
end
function
Update(
float
deltaTime)
// First calculate the ideal position
Vector3
idealPosition
=
target
.
position
-
target
.
forward
*
hDist
+
target
.
up
*
vDist
// Calculate the vector FROM ideal TO actual
Vector3
displacement
=
actualPosition
-
idealPosition
// Compute the acceleration of the spring,
and then integrate
Vector3
springAccel
= (-
springConstant
*
dis-
placement
) -
(
dampConstant
*
velo-
city
)
velocity
+=
springAccel
*
deltaTime
actualPosition
+=
velocity
*
deltaTime
// Update camera matrix
ComputeMatrix()
end
end
The biggest advantage of a spring camera is that when the target object turns, the
camera will have a bit of a delay before it starts turning as well. This results in a
sense of turning that's much more aesthetically pleasing than a basic follow cam-
era. And even though the spring camera looks much better than the basic follow
camera, it does not require too many additional calculations.
