#ifndef FRUSTUM_H

#define FRUSTUM_H

/**

* Frustum Class written by Justin Klein, 2004

*

* This class provides the functions necessary to implement Frustum Culling in OpenGL.

* What this means is, the class determines if a point, sphere, or cube is located within

* the camera's viewspace. If not, than the object may be omitted from the scene.

* This can drastically reduce the processing time required to render large 3D environments.

**/

/**

* Call this every time the camera moves (to update the frustum)

**/

void CalculateFrustum();

/**

* This takes a 3D point and returns TRUE if it's inside of the frustum

**/

bool PointInFrustum(float x, float y, float z);

/**

* This takes a 3D point and a radius and returns TRUE if any part of the sphere is inside of the frustum

**/

bool SphereInFrustum(float x, float y, float z, float radius);

/**

* This takes the center and half the length of a cube and returns TRUE if any piece of it is inside the frustum

**/

bool CubeInFrustum( float x, float y, float z, float size );