C++ box samples are in [MotionBuilder]\OpenRealitySDK\Samples\boxes.
         
         To see the plugins in MotionBuilder:
         
         
            - Build the sample plugins.
            
- Choose Asset Browser > Constraints.
            
- Drag and drop a new relations constraint
               in the viewer.
            
- Click Plugins in the relations object
               browser to expand the list.
            
- The plugin boxes display in this list.
               Drag the boxes into the Relations pane to use the box in a Relations
               constraint.
            
Box samples
         - box_template
- 
               Template for boxes: this plugin
                     has no particular functionality, but is used as a template for box development.
                   
- boxquaternion
- 
                Quaternion to Rotation conversion
                     and versa. This plugin adds two new types of boxes enabling the
                     conversion between Euler rotations and Quaternions so you can connect
                     the quaternion values to other boxes in the constraint.
                   
- boxsineramp
- 
               Sine Ramp Source: creates
                     a box similar to the one already available in a Relations constraint.
                   
- boxtransport
- 
               Creates a box to control the
                     Transport Controls. It provides input connectors to trigger timeline
                     play action from a relations constraint. To test this plugin: drag and
                     drop the 'OR - Tranport Box' box in the constraints window. Play
                     is activated when data is connected.
                   
- boxvector
- 
               Function: Vector to Number
                     converter.
                   This simple plugin does
                     the conversion between a single incoming value in vector format
                     and three separate connectors with the X, Y, and Z values of the
                     incoming vector. It is found in the /Plugins object browser of a Relations constraint.