1. IntrSrfRayFreePreprocess
2. IntrSrfRayPreprocessSrf
3. IntrSrfRayTestRay
4. UserCntrSrfWithPlane
5. UserDescribeError
6. UserFatalError
7. UserPolyline2LinBsplineCrv
8. UserPolylines2LinBsplineCrvs
9. UserSrfVisibConeDecomp
10. UserViewingConeSrfDomains
11. UserVisibilityClassify