利用GLUT提供的9种三维实体分别绘制圆锥体、四面体、正方体、正十二面体、正二十面体、正八面体、球体、圆球体和茶壶模型，并应用鼠标交互菜单实现实体图和线框图之间的切换。-9 provided by GLUT were drawn three-dimensional solid cone, tetrahedron, cube, dodecahedron, icosahedron, octahedron, sphere, spherical body and the teapot model, an

用opengl绘制一个三棱锥,使用扇形绘制模式绘制了三棱锥的三个棱面，然后再绘制了三棱锥的底面，并启用了深度测试-Using opengl to draw a triangular pyramid, with three fan-shaped drawing mode to draw the three facet pyramid, and then draw the pyramid' s bottom three, and enable the depth test