The Spatial Modeler SDK 2015 is built on top of Visual Studio 2013 Update 2. The supported configuration and platform combinations are Win32Debug, Win32Release, x64UDebug, and x64URelease. As you might expect, the Win32 configurations build 32-bit binaries and the x64 configurations build 64-bit binaries. If you are building plug-ins for IMAGINE, you must provide 32-bit binaries (Release only), and it is recommended that you provide 64-bit binaries as well, since IMAGINE 2015 is a hybrid system, with some executables running in 32-bit and some running in 64-bit, when possible. If you are using the SMSDK in your own environment, you only need to provide binaries for whichever configurations are appropriate.
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