Cameras - Game Programming Algorithms and Techniques - page 213

float t
// speed is how much t changes per second
float speed
// Actual camera matrix
Matrix cameraMatrix

// Calculates the camera matrix given current
index and t
function ComputeMatrix()
// Eye position is the spline at the current
t/index
Vector3 eye = path .Compute(index, t)
// Get point a little bit further ahead to
get the target point
Vector3 target = path.Compute( index , t +

0.05f)

// For y-up world
Vector3 up = Vector3 (0, 1, 0)

cameraMatrix = CreateLookAt( eye , target , up )

end

function Initialize( float mySpeed )
// The initial index should be 1 (because 0
is P0 initially)
index = 1
t = 0.0f
speed = mySpeed

ComputeMatrix()

end

function Update( float deltaTime )
t += speed * deltaTime

// If t > = 1.0f, we should move to the next
control point
// This code assumes that the speed won't be