Optimised mesh traversal for dynamic mesh compression
Graphical Models
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For various 3D Animation processing, representing mesh geometry in local rather the world coordinate systems is very useful. One can investigate the representation of vertex locations relative to a local coordinate frame (LCF) in the compression of dynamic 3D meshes. Unlike the world coordinates, which scatter in a wide range and show non linear behavior of the vertices, the local coordinates exhibit a large clustering behavior of the vertex over time. This property is very useful for exploiting a large coherence over the vertex trajectory and between neighboring vertices. In this paper, we discuss the use of the LCF in mesh encoding and we introduce a new and simple predictive scheme for single-rate compression for animated meshes. Our geometry encoding strategy is based on a region growing encoding order and only the delta vectors between original and predicted locations are encoded in a local coordinate system, which splits into two tangential and one normal components. Our approach is simple, efficient and well suited for real time applications.