/// <summary>
/// Finds the point on this spline that minimises a given distance function
/// </summary>
/// <param name="distance"> Distance function </param>
/// <param name="iterations"> Number of iterations (accuracy). 5 is pretty good. </param>
/// <returns> Returns the time on the spline of the closest point </returns>
public override float FindClosestPoint( DistanceToPointDelegate distance, int iterations )
{
CatmullRomSpline.DistanceCalculator calculator = new CatmullRomSpline.DistanceCalculator( distance );
float closestFraction = 0;
int numControlPoints = m_BaseSpline.ControlPoints.Count;
CatmullRomSpline.Evaluator eval = new CatmullRomSpline.Evaluator( );
for ( int cpIndex = 0; cpIndex < numControlPoints; ++cpIndex )
{
MakeEvaluator( ref eval, cpIndex, m_BaseSpline, m_Offset );
closestFraction = calculator.GetClosestPointInInterval( eval, 1.0f, iterations );
}
return closestFraction;
}
/// <summary>
/// Calculates the position on the spline at fraction t
/// </summary>
public override Point3 EvaluatePosition( float t )
{
CatmullRomSpline.Evaluator eval = new CatmullRomSpline.Evaluator( );
MakeEvaluator( ref eval, t, m_BaseSpline, m_Offset );
return eval.EvaluatePosition( );
}
/// <summary>
/// Calculates the second derivative on the spline at fraction t
/// </summary>
public override Vector3 EvaluateSecondDerivative( float t )
{
CatmullRomSpline.Evaluator eval = new CatmullRomSpline.Evaluator( );
MakeEvaluator( ref eval, t, m_BaseSpline, m_Offset );
return eval.EvaluateSecondDerivative( );
}
/// <summary>
/// Calculates the tangent, bi-normal, normal, speed and curvature on the spline at fraction t
/// </summary>
public override CurveFrame EvaluateFrame( float t )
{
CatmullRomSpline.Evaluator eval = new CatmullRomSpline.Evaluator( );
MakeEvaluator( ref eval, t, m_BaseSpline, m_Offset );
return eval.EvaluateFrame( );
}
