#include <boost/qvm/mat_operations.hpp>
namespace boost
{
namespace qvm
{
template <class T>
-unspecified-return-type
perspective_lh( T fov_y, T aspect, T zn, T zf );
}
}
A 4x4 projection matrix of unspecified type of the following form:
xs 0 0 0 0 ys 0 0 0 0 zf/(zf-zn) -zn*zf/(zf-zn) 0 0 1 0
where ys=cot(fov_y/2) and xs=ys/aspect.