/// <summary>
/// Creates a merged bounding sphere.
/// </summary>
/// <param name="original">
/// The original.
/// </param>
/// <param name="additional">
/// The additional.
/// </param>
/// <returns>
/// The merged bounding sphere.
/// </returns>
public static BoundingSphere CreateMerged(BoundingSphere original, BoundingSphere additional)
{
var vector = additional.center - original.center;
var distance = vector.Length;
if (original.radius + additional.radius >= distance)
{
if (original.radius - additional.radius >= distance)
{
return original;
}
if (additional.radius - original.radius >= distance)
{
return additional;
}
}
var vector3 = vector * (1 / distance);
var r1 = Math.Min(-original.radius, distance - additional.radius);
var r2 = (Math.Max(original.radius, distance + additional.radius) - r1) * 0.5;
return new BoundingSphere { Center = original.Center + (vector3 * (r2 + r1)), Radius = r2 };
}
/// <summary>
/// Determines if the sphere intersects with the specified sphere.
/// </summary>
/// <param name="sphere">
/// The sphere to check against.
/// </param>
/// <returns>
/// True if the spheres intersect.
/// </returns>
public bool Intersects(BoundingSphere sphere)
{
double d2 = this.center.DistanceToSquared(sphere.center);
return (this.radius * this.radius) + (2.0 * this.radius * sphere.radius) + (sphere.radius * sphere.radius) > d2;
}
/// <summary>
/// Determines if the sphere intersects with the specified sphere.
/// </summary>
/// <param name="sphere">
/// The sphere to check against.
/// </param>
/// <returns>
/// True if the spheres intersect.
/// </returns>
public bool Intersects(BoundingSphere sphere)
{
double d2 = this.center.DistanceToSquared(sphere.center);
return((this.radius * this.radius) + (2.0 * this.radius * sphere.radius) + (sphere.radius * sphere.radius) > d2);
}
