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    CAXCAD's current built-in optical surface can already meet the needs of most users, including refraction, reflection, spherical, aspherical, polynomial, diffraction grating and so on.

    However, users sometimes have special needs, at this time you can use CAXCAD DLL extension surface, using VC++ to achieve custom.

    New project, select win32 DLL

    Create an empty DLL

    Import the header files and C++ routines we provided

    The C++ file defines the CAXCAD face type standard in detail

    Compile the connection to generate the DLL file

    Place it in the specified folder

    Select Extended Surface Dll for surface type

    After selecting the specified face type, the lens file LDE table can see that it was successfully called.