RTS_GetVersion Callback Reference
    RTSHADER_API ULONG RTS_GetVersion()
    {
        return XSI_RTSHADER_VERSION;
    }

Each dynamic library needs to implement the RTS_GetVersion callback function. This tells Softimage which version of the Realtime Shader API this shader was compiled with.

Note:
This callback is mandatory
Returns:
Softimage version number
See also:
Realtime Shader Callbacks, XSI_RTSHADER_VERSION