deleted codes of lookat

inc/hgl/math/Matrix.h

@@ -68,14 +68,6 @@ namespace hgl
                             float znear,
                             float zfar);
 
-    /**
-     * 产生一个lookat变换矩阵
-     * @param eye 眼睛位置
-     * @param target 目标位置
-     * @param up 向上向量
-     */
-    Matrix4f lookat(const Vector3f &eye,const Vector3f &target,const Vector3f &up);
-
     inline Matrix4f translate(const Vector3f &v)
     {
         return glm::translate(Matrix4f(1.0f),v);

src/Math/Matrix4f.cpp

@@ -102,33 +102,4 @@ namespace hgl
           0.0f
         );
     }
-
-    Matrix4f lookat(const Vector3f &eye,const Vector3f &target,const Vector3f &up)
-    {
-        Vector3f forward=normalize(target-eye);
-        Vector3f right=normalize(cross(forward,up));
-
-        Vector3f nup=cross(right,forward);
-
-        return Matrix4f(   right.x,
-                             nup.x,
-                        -forward.x,
-                              0.0f,
-
-                           right.y,
-                             nup.y,
-                        -forward.y,
-                              0.0f,
-
-                           right.z,
-                             nup.z,
-                   -forward.z/2.0f,
-                              0.0f,
-
-                  dot(eye,right  ),
-                  dot(eye,nup    ),
-                  dot(eye,forward),
-                              1.0f
-        );
-    }
 }//namespace hgl