public double Intersect(Sphere3D sphere)
{
var l = Direction.Normalized;
var ldpc = l.DotProduct(sphere.Position);
var d = ldpc.Sqr() - l.Square * (sphere.Position.Square - sphere.RadiusSquare);
if (d < 0)
{
return(double.PositiveInfinity);
}
d = Math.Sqrt(d);
var result = ldpc - d;
if (result >= 0)
{
return(result);
}
result = ldpc + d;
if (result >= 0)
{
return(result);
}
return(double.PositiveInfinity);
}
public bool IntersectsBall(Sphere3D ball)
{
return((this.Position - ball.Position).Square <= MathEx.Sqr(Radius + ball.Radius));
}