Guix

GLU, or OpenGL Utility Library provides some higher-level functionality not provided by just OpenGL itself. Some of GLU's Features include: Scaling of 2D images and creation of mipmap pyramids, Transformation of object coordinates into device coordinates and vice versa, Support for NURBS surfaces, Support for tessellation of concave or bow tie polygonal primitives, Specialty transformation matrices for creating perspective and orthographic projections, positioning a camera, and selection/picking, Rendering of disk, cylinder, and sphere primitives, Interpreting OpenGL error values as ASCII text.