//initializng
/// <summary>
/// Constructor
/// </summary>
public Camera(StreamReader file)
{
Load(file);
SetNewAngle((int)currentAngle);
CreateProjectionMatrix();
frustum = new BoundingFrustum();
}
/// <summary>
/// Check if the bounding frustum and point intersect
/// </summary>
/// <param name="a">Bounding frustum</param>
/// <param name="sphere">Point as Vector3</param>
/// <returns>True or false/bounding volume an the point intersects or not/returns>
public static bool Intersects(BoundingFrustum a, Vector3 point)
{
Vector4 vec = new Vector4(point, 1f);
for (int i = 0; i < 6; i++)
if (Plane.Dot(a.planes[i], vec) < 0)
return false;
return true;
}
//intersections
/// <summary>
/// Check if the bounding frustum and the bounding sphere intersect
/// </summary>
/// <param name="a">Bounding frustum</param>
/// <param name="sphere">Bounding sphere</param>
/// <returns>True or false/bounding volumes intersects or not</returns>
public static bool Intersects(BoundingFrustum a, BoundingSphere sphere)
{
Vector4 vec = new Vector4(sphere.Center, 1f);
for (int i = 0; i < 6; i++)
if (Plane.Dot(a.planes[i], vec) + sphere.Radius < 0)
return false;
return true;
}
/// <summary>
/// Check if the bounding frustum and the bounding sphere intersect
/// </summary>
/// <param name="a">Bounding frustum</param>
/// <param name="sphere">Bounding box</param>
/// <returns>True or false/bounding volumes intersects or not</returns>
public static bool Intersects(BoundingFrustum a, BoundingBox box)
{
for (int i = 0; i < 6; i++)
{
//calculating the positive vertex
//(the vertex from the box that is further along the normal's direction)
Vector4 p = new Vector4(box.Minimum,1f);
if (a.planes[i].Normal.X >= 0)
p.X = box.Maximum.X;
if (a.planes[i].Normal.Y >= 0)
p.Y = box.Maximum.Y;
if (a.planes[i].Normal.Z >= 0)
p.Z = box.Maximum.Z;
if (Plane.Dot(a.planes[i], p)<0) //if this vertex is not on a good side of the plane return false
return false;
}
return true;
}
