Ex 16: A user-defined operand (UDOC) is created which provides the total center thickness between 2 surfaces. Since a UDOC is an executable that needs to be called from OpticStudio, a UDOC can only be created by languages which can compile code (C#/C++). The source code is provided, but it needs to be compiled with the USER OPERAND solution rather than the standalone application solution. The EXE also needs to be named UDOC##.exe and placed in the ZOS-API\Operands folder.
