/// <summary>
/// Containment test between this <see cref="BoundingFrustum"/> and specified <see cref="Vector3"/>.
/// </summary>
/// <param name="point">A <see cref="Vector3"/> for testing.</param>
/// <param name="result">Result of testing for containment between this <see cref="BoundingFrustum"/> and specified <see cref="Vector3"/> as an output parameter.</param>
public void Contains(ref Vector3 point, out ContainmentType result)
{
for (var i = 0; i < PlaneCount; ++i)
{
// TODO: we might want to inline this for performance reasons
if (PlaneHelper.ClassifyPoint(ref point, ref this._planes[i]) > 0)
{
result = ContainmentType.Disjoint;
return;
}
}
result = ContainmentType.Contains;
}
public void Contains(ref BoundingSphere sphere, out ContainmentType result)
{
float val;
ContainmentType contained;
// We first check if the sphere is inside the frustum
this.Contains(ref sphere.Center, out contained);
// The sphere is inside. Now we need to check if it's fully contained or not
// So we see if the perpendicular distance to each plane is less than or equal to the sphere's radius.
// If the perpendicular distance is less, just return Intersects.
if (contained == ContainmentType.Contains)
{
val = PlaneHelper.PerpendicularDistance(ref sphere.Center, ref this.bottom);
if (val < sphere.Radius)
{
result = ContainmentType.Intersects;
return;
}
val = PlaneHelper.PerpendicularDistance(ref sphere.Center, ref this.far);
if (val < sphere.Radius)
{
result = ContainmentType.Intersects;
return;
}
val = PlaneHelper.PerpendicularDistance(ref sphere.Center, ref this.left);
if (val < sphere.Radius)
{
result = ContainmentType.Intersects;
return;
}
val = PlaneHelper.PerpendicularDistance(ref sphere.Center, ref this.near);
if (val < sphere.Radius)
{
result = ContainmentType.Intersects;
return;
}
val = PlaneHelper.PerpendicularDistance(ref sphere.Center, ref this.right);
if (val < sphere.Radius)
{
result = ContainmentType.Intersects;
return;
}
val = PlaneHelper.PerpendicularDistance(ref sphere.Center, ref this.top);
if (val < sphere.Radius)
{
result = ContainmentType.Intersects;
return;
}
// If we get here, the sphere is fully contained
result = ContainmentType.Contains;
return;
}
//duff idea : test if all corner is in same side of a plane if yes and outside it is disjoint else intersect
// issue is that we can have some times when really close aabb
// If we're here, the the sphere's centre was outside of the frustum. This makes things hard :(
// We can't use perpendicular distance anymore. I'm not sure how to code this.
throw new NotImplementedException();
}
