/// <summary>
/// Test if a frustum is fully inside, outside, or just intersecting the sphere.
/// </summary>
/// <param name="box">The box for testing.</param>
/// <param name="result">The containment type as an output parameter.</param>
public ContainmentType Contains(BoundingFrustum frustum)
{
// Check if all corners are in sphere.
bool inside = true;
Vector3[] corners = frustum.GetCorners();
foreach (Vector3 corner in corners)
{
if (this.Contains(corner) == ContainmentType.Disjoint)
{
inside = false;
break;
}
}
if (inside)
{
return(ContainmentType.Contains);
}
// Check if the distance from sphere center to frustrum face is less than radius.
double dmin = 0;
// TODO : calcul dmin
if (dmin <= Radius * Radius)
{
return(ContainmentType.Intersects);
}
// Else disjoint
return(ContainmentType.Disjoint);
}
/// <summary>
/// Creates the smallest <see cref="BoundingSphere"/> that can contain a specified <see cref="BoundingFrustum"/>.
/// </summary>
/// <param name="frustum">The frustum to create the sphere from.</param>
/// <returns>The new <see cref="BoundingSphere"/>.</returns>
public static BoundingSphere CreateFromFrustum(BoundingFrustum frustum)
{
return(CreateFromPoints(frustum.GetCorners()));
}