The Billboard sample illustrates the billboarding technique. Rather than rendering complex 3D models (such as a high-polygon tree model), billboarding renders a 2D image of the model and rotates it to always face

开发语言为vrml，虚拟现实标记语言 开发环境是lyinux 此代码为广告版事例-Development language for the vrml, virtual reality markup language development environment is the code for the ad lyinux case