Authors:
            
                    Florian Echtler
                    
                        
                    
                    ; 
                
                    Manuel Huber
                    
                        
                    
                    ; 
                
                    Daniel Pustka
                    
                        
                    
                    ; 
                
                    Peter Keitler
                    
                        
                    
                     and
                
                    Gudrun Klinker
                    
                        
                    
                    
                
        
        
            Affiliation:
            
                    
                        
                    
                    Institut für Informatik I16, Technische Universität München, Germany
                
        
        
        
        
        
             Keyword(s):
            Scenegraph, spatial relationship graph, augmented reality, tracking.
        
        
            
                Related
                    Ontology
                    Subjects/Areas/Topics:
                
                        Augmented, Mixed and Virtual Environments
                    ; 
                        Computer Vision, Visualization and Computer Graphics
                    ; 
                        Distributed Augmented, Mixed and Virtual Reality
                    ; 
                        Geometry and Modeling
                    ; 
                        Graphics Architectures
                    ; 
                        Interactive Environments
                    ; 
                        Rendering
                    ; 
                        Systems and Software Architectures for Rendering
                    
            
        
        
            
                Abstract: 
                Scene graphs have been a core element of 3D graphics since the publication of Inventor. However, in Virtual and Augmented Reality applications, 3D graphics are often interleaved with and controlled by real-world data provided by pose trackers, cameras and other kinds of sensors. In such a setup, the generalized concept of a Spatial Relationship Graph (SRG) might be better suited as an underlying data structure to describe the application and its components. In this paper, we will give an overview of the SRG concept, describe its difference to a scene graph and provide an example AR application built upon an SRG-based tracking library.