1.1 --- a/include/Matrix.h	Sun May 19 20:17:16 2013 -0500
     1.2 +++ b/include/Matrix.h	Sun May 19 23:30:28 2013 -0500
     1.3 @@ -818,7 +818,7 @@
     1.4        //////////////////////////////////////////////////////////////////////////
     1.5        // Matrix functions
     1.6        // TODO: The determinant functions suffer from some bad round off error.
     1.7 -      // If it significant?  I don't know.  None of the other game engines
     1.8 +      // Is it significant?  I don't know.  None of the other game engines
     1.9        // I've checked bother to do anything to calculate det more accurately.
    1.10        // So maybe it just doesn't matter enough for game purposes.
    1.11  

     2.1 --- a/include/Transform.h	Sun May 19 20:17:16 2013 -0500
     2.2 +++ b/include/Transform.h	Sun May 19 23:30:28 2013 -0500
     2.3 @@ -39,14 +39,21 @@
     2.4          // (x = 0, y = 1, z = 2)
     2.5          template <typename T>
     2.6          void get_shear_mat44(arda::Math::Matrix44<T> & M, int i, int j, float s);
     2.7 -      
     2.8 +
     2.9 +        // Transformation matrix for combination of translation by d and rotation by angle around v.
    2.10          template <typename T>
    2.11          void get_transform_mat44(arda::Math::Matrix44<T> & M, float angle, arda::Math::Vector3<T> v, arda::Math::Vector3<T> d);
    2.12  
    2.13          // Rotate by angle around v with center of rotation p.
    2.14          template <typename T>
    2.15          void get_rot_about_point_mat44(arda::Math::Matrix33<T> & M, float angle, arda::Math::Vector3<T> v, arda::Math::Vector3<T> p);
    2.16 -      
    2.17 +
    2.18 +        ////////////////////////////////////////      
    2.19 +        // Projection matrices
    2.20 +
    2.21 +        template <typename T>
    2.22 +        void get_ortho_mat44(arda::Math::Matrix44<T> & M, T near, T far, T left, T right, T bottom, T top);
    2.23 +
    2.24          } // namespace Math
    2.25     
    2.26      } // namespace arda
    2.27 @@ -196,4 +203,17 @@
    2.28      M[15] = T(1);
    2.29      }
    2.30  
    2.31 +////////////////////////////////////////////////////////////////////////////////
    2.32 +template <typename T>
    2.33 +void arda::Math::get_ortho_mat44(arda::Math::Matrix44<T> & M, T near, T far, T left, T right, T bottom, T top)
    2.34 +    {
    2.35 +    M.assign(
    2.36 +        2 / (right - left),                T(0),                              T(0),                          T(0),
    2.37 +        T(0),                              2 / (top - bottom),                T(0),                          T(0),
    2.38 +        T(0),                              T(0),                              - 2 / (far - near),            T(0),
    2.39 +        - (right + left) / (right - left), - (top + bottom) / (top - bottom), - (far + near) / (far - near), T(1) );
    2.40 +    
    2.41 +    }
    2.42 +
    2.43 +
    2.44  #endif