OP2H
Electromagnetic Field Assessment in Urban Zone with Hierarchic Description and  Homogeneisation Process



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Main Topic
Navigation in a complex scene


A hierarchical approach of the navigation in a scene includes two aspects:
Hierarchical Navigation
Hierarchical Description

  • Bounding box: approach from bottom to top. At the bottom of the tree, the lowest level's detail  is enclosed in a bounding box. By ascending the tree, each node includes all the volumes beneath it. At the root of the tree is a volume that encompasses the whole scene.



  • Octree (3D), Quadtree (2D): approach from top to bottom. The whole scene is partitionning by  recursively subdividing it into sub-regions.

Partly dynamical approach:

Dynamical homogeneisation but static description of the scene. The scene is first described with different levels of details (for instance 3 levels of description as shown below) and the choice of the level of details is made by the user. During the computation and  according to the position of the receiver, the dynamical appraoch developed in WP2 may be applied.
    

High level

 
Intermediate level (main shapes and recesses)

 
Low level (one face for a façade)