The RTX C++ SDK has been improved for Version 12.6. One of the improvements will require minor source code changes when you upgrade to Version 12.6 of Investor/RT and build with the latest irtsdk.h SDK. The CPEN data type in Version 12.5 RTX is a C structure containing a pen color, pen width and pen style setting. In 12.6, CPEN is now a C++ class with a proper constructor and methods for working with CPEN instances. Version 12.5 declarations of CPEN looked like this:
If you plan to use Visual Studio 2013 to build RTX Extensions, you must go to File → Preferences → Configuration and set the Configuration Variable called VisualStudioVersion to 2013.
Users that plan to build RTX Extensions with Visual Studio 2010 must first set several Environment Variables to tell Visual Studio and Windows were to look for lib files, exe files and .h include files for C++ (note that these are User Environment Variables, not System Environment Variables). This is done by going to the Start menu and searching for "env." Then click on this link: 