void set_equation(const Vector4 &);
void set_plane(const Vector3 &, const Vector3 &);
void update_shader_data(ProgramData &, const Matrix &, unsigned) const;
void set_equation(const Vector4 &);
void set_plane(const Vector3 &, const Vector3 &);
void update_shader_data(ProgramData &, const Matrix &, unsigned) const;