The Vizard SDK gives C++ developers the ability to extend the functionality of Vizard. The SDK is used to create DLL plug-ins that can interface with Vizard scripts. The plug-ins can be used for many things, including:
Access to underlying OpenSceneGraph objects (nodes, textures, etc..)
Creating custom OpenSceneGraph nodes and textures
Interfacing with hardware devices (trackers, sensors, etc..)
The Vizard SDK is available on the Vizard download page. Be sure to download the version of the SDK that is compatible with your version of Vizard. The SDK package includes the necessary header/lib files to compile your DLL. It also includes sample Visual Studio projects, and scripts showing how to interface with the plug-ins.