在WPF - XBrowser 下的3D物理引擎代码及演示demo-In WPF- XBrowser under the 3D physics engine code and demo demo

wpf 简单的3d 图形编程和入门学习，熟悉各个代码模块和写法(WPF simple graphical programming and 3D entry learning, familiar with each code module and writing)