/// <summary>
/// Constructs an interpolated path based on the Key Frames.
/// Options are Linear or Cubic interpolation
/// </summary>
private void BuildPath()
{
this.currentPathPoints.Clear();
// a point on a cubic spline is affected by every other point
// so we need to build the cubic equations for each control point
// by looking at the entire curve. This is what calculateCubicSpline does
var looks = new Vector3[this.keyFrames.Count];
var positions = new Vector3[this.keyFrames.Count];
var ups = new Vector3[this.keyFrames.Count];
for (int i = 0; i < this.keyFrames.Count; i++)
{
looks[i] = this.keyFrames[i].LookAt;
positions[i] = this.keyFrames[i].Position;
ups[i] = this.keyFrames[i].Up;
}
int count = this.keyFrames.Count - 1;
Spline[] posCubic;
Spline.CalculateCubicSpline(ref count, ref positions, out posCubic);
Spline[] lookCubic;
Spline.CalculateCubicSpline(ref count, ref looks, out lookCubic);
Spline[] upCubic;
Spline.CalculateCubicSpline(ref count, ref ups, out upCubic);
for (int i = 0; i < this.keyFrames.Count - 1; i++)
{
for (int j = 0; j < this.pathSteps; j++)
{
float k = j / (float)(this.pathSteps - 1);
Vector3 center = posCubic[i].GetPointOnSpline(k);
Vector3 up = upCubic[i].GetPointOnSpline(k);
Vector3 look = lookCubic[i].GetPointOnSpline(k);
var cam = new CameraPoint(ref center, ref look, ref up);
this.currentPathPoints.Add(cam);
}
}
}
public static Spline[] CalculateCubicSpline(int n, Vector3[] v)
{
Spline[] c = (Spline[])null;
Spline.CalculateCubicSpline(ref n, ref v, out c);
return(c);
}
