文件名称：glu 1.3 specification
文件大小：323KB
文件格式：PDF
更新时间：2016-09-15 12:02:12
glu 1.3 说明文档 帮助手册
The GL Utilities (GLU) library is a set of routines designed to comple- ment the OpenGL graphics system by providing support for mipmapping, matrix manipulation, polygon tessellation, quadrics, NURBS, and error han- dling. Mipmapping routines include image scaling and automatic mipmap generation. A variety of matrix manipulation functions build projection and viewing matrices, or project vertices from one coordinate system to another. Polygon tessellation routines convert concave polygons into triangles for easy rendering. Quadrics support renders a few basic quadrics such as spheres and cones. NURBS code maps complicated NURBS curves and trimmed surfaces into simpler OpenGL evaluators. Lastly, an error lookup routine translates OpenGL and GLU error codes into strings. GLU library rou- tines may call OpenGL library routines. Thus, an OpenGL context should be made current before calling any GLU functions. Otherwise an OpenGL error may occur. All GLU routines, except for the initialization routines listed in Section 2, may be called during display list creation. This will cause any OpenGL com- mands that are issued as a result of the call to be stored in the display list. The result of calling the intialization routines after glNewList is unde ned.