public static bool IsInOrIntersectFrustum(ref BoundingFrustum frustum, ref BoundingBox box, ref BoundingSphere sphere)
{
for (int i = 0; i < 6; i++)
{
var plane = frustum.GetPlane(i);
var sphereRet = plane.Intersects(ref sphere);
if (sphereRet == PlaneIntersectionType.Back)
{
return(false);
}
else if (sphereRet == PlaneIntersectionType.Intersecting)
{
return(true);
}
GetBoxToPlanePVertexNVertex(ref box, ref plane.Normal, out Vector3 p, out Vector3 n);
var boxRet = Collision.PlaneIntersectsPoint(ref plane, ref p);
if (boxRet == PlaneIntersectionType.Back)
{
return(false);
}
else if (boxRet == PlaneIntersectionType.Intersecting)
{
return(true);
}
}
return(true);
}
/// <summary>
/// Containment test between this <see cref="BoundingFrustum"/> and specified <see cref="BoundingFrustum"/>.
/// </summary>
/// <param name="instance">Instance</param>
/// <param name="frustum">A <see cref="BoundingFrustum"/> for testing.</param>
/// <returns>Result of testing for containment between this <see cref="BoundingFrustum"/> and specified <see cref="BoundingFrustum"/>.</returns>
public static ContainmentType FrustumContainsFrustum(this BoundingFrustum instance, BoundingFrustum frustum)
{
if (instance == frustum)
{
return(ContainmentType.Contains);
}
var intersects = false;
for (var i = 0; i < 6; ++i)
{
var plane = instance.GetPlane(i);
frustum.Intersects(ref plane, out PlaneIntersectionType planeIntersectionType);
if (planeIntersectionType == PlaneIntersectionType.Back)
{
return(ContainmentType.Disjoint);
}
else if (planeIntersectionType == PlaneIntersectionType.Intersecting)
{
intersects = true;
break;
}
}
return(intersects ? ContainmentType.Intersects : ContainmentType.Contains);
}
public static bool Intersects(ref BoundingFrustum frustum, ref BoundingBox box)
{
for (int i = 0; i < 6; i++)
{
var plane = frustum.GetPlane(i);
GetBoxToPlanePVertexNVertex(ref box, ref plane.Normal, out Vector3 p, out Vector3 n);
if (Collision.PlaneIntersectsPoint(ref plane, ref p) == PlaneIntersectionType.Back)
{
return(false);
}
}
return(true);
}
public static bool Intersects(ref BoundingFrustum frustum, ref BoundingSphere sphere)
{
for (int i = 0; i < 6; i++)
{
var plane = frustum.GetPlane(i);
var result = plane.Intersects(ref sphere);
if (result == PlaneIntersectionType.Back)
{
return(false);
}
else if (result == PlaneIntersectionType.Intersecting)
{
return(true);
}
}
return(true);
}
