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    /// Creates a perspective projection similar to gluPerspective

    /// Description from gluPerspective: perspective_Mat4x4f specifies a viewing frustum into

    /// the world coordinate system. In general, the aspect ratio in perspective_Mat4x4f

    /// should match the aspect ratio of the associated viewport. For example, aspect = 2.0

    /// means the viewer's angle of view is twice as wide in x as it is in y. If the viewport

    /// is twice as wide as it is tall, it displays the image without distortion.

    Mat4x4f perspective_Mat4x4f(float fovy, float aspect, float zNear, float zFar);

    /// Creates a perspective matrix similar to glFrustum

    Mat4x4f frustum_Mat4x4f(float  	left,

                            float  	right,

                            float  	bottom,

                            float  	top,

                            float  	nearVal,

                            float  	farVal);

    /// Creates an orthographic projection matrix (similar to glOrtho)

    Mat4x4f ortho_Mat4x4f(float left,

                          float right,

                          float bottom,

                          float top,

                          float nearVal,

                          float farVal);

    /// Creates a 2D orthographic projection matrix (similar to gluOrtho2D)

    Mat4x4f ortho2D_Mat4x4f(float left, float right, float bottom, float top);

    /// Creates a view matrix similar to gluLookAt

    Mat4x4f lookAt_Mat4x4f(const Vec3f& eye, const Vec3f& at, const Vec3f& up);