Euclidean Shortest Path Sample
ESP is an advanced sample, which demonstrates usage of
    
    IEuclideanShortestPath_DG. 
The application
Press "Begin Sequence" button. Click at least two times on surface(s) to define the initial path. 
Press Calculate. The optimal path will be 
    displayed in red.  
Use the Initial Path controls to define the path exactly if some of the points 
        are not on surface. The initial guess path must not intersect with any surface 
        and must be outside of the objects. 
Click Reset to start over. 
Restart the application if an error happened 
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