[HOpenGL] Projection and Modelview Matrices

Hello to all I want to do View Frustum Culling using Octrees, and everything is working except for one small detail: I cannot find a way to access the Projection Matrix, nor the Modelview matrix, which are taken for granted in the C/C++ versions of the library. Am I missing something? I can of course calculate the clipping planes using lookat information and the arguments to the frustum function, but cannot believe there isn't a more elegant solution... ;-) Thanks in advance, Guilherme Lopes.