3D Graphics Basics - Game Coding Complete - page 476

Figure 14.14
Calculating the points of the view frustum.

public:
enum Side { Near, Far, Top, Right, Bottom, Left, NumPlanes };

Plane m_Planes[NumPlanes]; // planes of the frusum in camera space
Vec3 m_NearClip[4]; // verts of the near clip plane in camera space

Vec3 m_FarClip[4]; // verts of the far clip plane in camera space

float m_Fov; // field of view in radians

float m_Aspect; // aspect ratio - width divided by height

float m_Near; // near clipping distance

float m_Far; // far clipping distance

public:
Frustum();

bool Inside(const Vec3 &point) const;
bool Inside(const Vec3 &point, const float radius) const;
const Plane &Get(Side side) { return m_Planes[side]; }
void SetFOV(float fov) { m_Fov=fov; Init(m_Fov, m_Aspect, m_Near, m_Far); }
void SetAspect(float aspect)
{ m_Aspect=aspect; Init(m_Fov, m_Aspect, m_Near, m_Far); }
void SetNear(float nearClip)
{ m_Near=nearClip; Init(m_Fov, m_Aspect, m_Near, m_Far); }
void SetFar(float farClip)
{ m_Far=farClip; Init(m_Fov, m_Aspect, m_Near, m_Far); }
void Init(const float fov, const float aspect,
const float near, const float far);

void Render();
};