用OpenGL做的布尔运算的例子，简单好用，在这个基础上还可以再添加功能
资源文件列表
Boolean/Backup/csg.dsp , 3495
Boolean/csg.cpp , 11258
Boolean/csg.sdf , 21889024
Boolean/csg.sln , 951
Boolean/csg.v12.suo , 23040
Boolean/csg.vcxproj , 6429
Boolean/Debug/csg.exe , 558592
Boolean/Debug/csg.ilk , 1228440
Boolean/Debug/csg.log , 142
Boolean/Debug/csg.obj , 41549
Boolean/Debug/csg.pdb , 2928640
Boolean/Debug/csg.tlog/cl.command.1.tlog , 3990
Boolean/Debug/csg.tlog/CL.read.1.tlog , 4352
Boolean/Debug/csg.tlog/CL.write.1.tlog , 2522
Boolean/Debug/csg.tlog/csg.lastbuildstate , 185
Boolean/Debug/csg.tlog/link.command.1.tlog , 7936
Boolean/Debug/csg.tlog/link.read.1.tlog , 15408
Boolean/Debug/csg.tlog/link.write.1.tlog , 1166
Boolean/Debug/trackball.obj , 21750
Boolean/Debug/vc120.idb , 76800
Boolean/Debug/vc120.pdb , 94208
Boolean/trackball.cpp , 4506
Boolean/trackball.h , 287