public static bool Intersect(Bounding.Frustum a, BoundingBox b, out object intersection)
{
intersection = null;
var rel = SpatialRelation.Relation(b, a);
return(rel != RSpatialRelation.Outside);
}
// ----------------------------------------------------------------------------------------------
// -- Frustum -----------------------------------------------------------------------------------
// ----------------------------------------------------------------------------------------------
public static bool Intersect(Bounding.Frustum a, Vector3 b, out object intersection)
{
intersection = null;
foreach (Plane p in a.planes)
{
if (Vector3.Dot(p.Normal, b) + p.D > 0)
{
return(false);
}
}
return(true);
}
public static RSpatialRelation Relation(BoundingBox a, Bounding.Frustum b)
{
Vector3 min, max;
RSpatialRelation rel = RSpatialRelation.AInsideB;
for (int i = 0; i < b.planes.Length; i++)
{
if (b.planes[i].Normal.X > 0)
{
min.X = a.Minimum.X;
max.X = a.Maximum.X;
}
else
{
min.X = a.Maximum.X;
max.X = a.Minimum.X;
}
if (b.planes[i].Normal.Y > 0)
{
min.Y = a.Minimum.Y;
max.Y = a.Maximum.Y;
}
else
{
min.Y = a.Maximum.Y;
max.Y = a.Minimum.Y;
}
if (b.planes[i].Normal.Z > 0)
{
min.Z = a.Minimum.Z;
max.Z = a.Maximum.Z;
}
else
{
min.Z = a.Maximum.Z;
max.Z = a.Minimum.Z;
}
if (Vector3.Dot(b.planes[i].Normal, min) + b.planes[i].D > 0)
{
return(RSpatialRelation.Outside);
}
if (Vector3.Dot(b.planes[i].Normal, max) + b.planes[i].D >= 0)
{
rel = RSpatialRelation.Intersect;
}
}
return(rel);
}
public static bool Intersect(Bounding.Frustum a, Vector2 b, out object intersection)
{
return(Intersect(a, new Vector3(b, 0), out intersection));
}