public Cone(Vect3 position, Vect3 axis, double phiDegree, Color color)
: base(position, axis)
{
CosPhi = System.Math.Cos(MathHelper.ToRadians(phiDegree));
AxisLength = axis.Length();
LookAt = axis / AxisLength;
Color = color;
}
public new Color GetColorAt(Vect3 hitPoint)
{
double hpLength = hitPoint.Length();
double x = System.Math.Acos(hitPoint.Y / hpLength) / System.Math.PI;
double y = System.Math.Acos(hitPoint.Z / hpLength) / System.Math.PI;
return(_texture.GetColorAt(x, y));
}
public new Sphere GetBoundingSphere()
{
var @base = Position + LookAt * AxisLength;
Vect3 tmp = @base.ProjectOn(LookAt);
var normal = (@base - tmp).Normalize();
double len = CosPhi * AxisLength;
normal *= len;
tmp = @base + normal;
@base = @base - normal;
var center = (Position + tmp + @base) / 3;
tmp = center - Position;
return(new Sphere(center, tmp.Length(), Color.Black));
}
public Sphere(Vect3 position, Vect3 lookAt, double rotationRad, Color color) : base(position, lookAt)
{
Color = color;
Radius = lookAt.Length();
// calculate the rotation of the 0-meridian
RotVect = lookAt;
// check so we don't end up with two linear dependent vectors
if (System.Math.Abs(RotVect.Y) > Constants.EPS &&
System.Math.Abs(RotVect.X) < Constants.EPS &&
System.Math.Abs(RotVect.Z) < Constants.EPS)
{
RotVect.X += 1;
}
else
{
RotVect.Y += 1;
}
RotVect = RotVect.CrossProduct(lookAt).Normalize();
LookAt = LookAt.Normalize();
Rotate(lookAt, rotationRad);
}
