Implementation of Valve Software's OpenVR API.

1. Create an openframeworks' project using the Project Generator, or add the addon's source files and the OpenVR headers to your existing project.
2. In Property Manager (open it from View -> Other Windows -> Property Manager), right click on your project to select Add Existing Property Sheet... and select the ofxOpenVR.props file.

Tested with the HTC Vive and the Oculus Rift (consumer version) on Windows 10.