viewvolume size at runtime

OpenGL OpenGL: Basic Coding
1

is there any way i can know what values the viewvolume has been set to when im running my program.

2

I’m not sure if it’s easy but you can get the current projection matrix using e.g.

GLdouble projMatrix[16];

glGetDoublev(GL_PROJECTION_MATRIX, projMatrix);

Of course now you have to get the values of the viewing volume from the matrix which I have no idea how to do that. Maybe you should also take a look at gluUnProject. Sorry but I cannot help more.