. Compression-de-la-géométrie, information constitue une partie très importante de l'information globale contenue dans un objet géométrique Une fois que nous avons montré comment il est possible de " compresser " et de réduire le coût de la connectivité d'un maillages (on est passé de plusieurs centaines de bits par sommetàsommetà 2.17 ou 1.62 bits par sommet dans le cas triangulaire ), il est temps de se concentrer sur l'information géométrique provenant des coordonnées des points dans l'espace : les quelques dizaines de bits par sommet nécessaires pour coder la géométrie ne sont plus négligeables. Dans ce cadre on part de l'observation que les coordonnées des sommets d'un maillage ne sont pascompì etement indépendantes entre elles, au moins dans la pratique : par exemple lorsqu'on considère des maillages approchant une surface lisse, on constate que les coordonnées d'un sommet sont assez proches de la moyenne des coordonnées de ses sommets voisins (sommets adjacents dans le maillage) Cette remarque a déjà conduitàconduità plusieurs stratégies de compression visantàvisantà mieux prédire et coder l'information géométriquè a partir de l'information combinatoire d'un maillage. Nous disposons déjà d'un ingrédient crucial, l'information de connectivité, ` a laquelle nos structures permettent d'accéder demanì ere efficace, sans la nécessité de décoder globalement la représentation de l'objet. L'idée de base serait de tirer profit de notre représentation hiérarchique d'un maillage afin d'adopter un repère local et une stratégie de prédiction pour coder la position de points avec des coordonnées locales, dont l'information géométrique est partagée par un nombre considérable de micro régions) et utiliser des coordonnées locales pour exprimer la position des autres sommets : ces coordonnées seraient relativesàrelativesà des repères locaux, chacun associéassociéà une micro région

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