On-the-fly appearance quantization on the GPU for 3D broadcasting

Hadim, Julien; Boubekeur, Tamy; Raynaud, Mickaël; Granier, Xavier; Schlick, Christophe

doi:10.1145/1229390.1229397

Cited by 1 publication

(1 citation statement)

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“…In [Hadim et al 2007] authors present a method to transmit the appearance (normals and colors) of the model, using quantization to reduce the amount of data to transfer. The quantization is computed on-the-fly by the server GPU and then transmitted to the client which performs the dequantization.…”

Section: Related Workmentioning

confidence: 99%

Progressive transmission of appearance preserving octree-textures

Lacoste

Perin

Jobard

2008

Proceedings of the 13th International Symposium on 3D Web Technology

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Figure 1: Architecture of the APO web 3D viewer. The client, a web browser applet, progressively downloads the APO texture, while rendering the coarse model with previously downloaded details. The normal field is encoded in the APO which is an Appearance Preserving Octree-texture. Normal mapping on the simplified mesh is done on the client side by the fragment shader. AbstractThe development of shape repositories and 3D databases rises the need of online visualization of 3D objects. The main issue with the remote visualization of large meshes is the transfer latency of the geometric information. The remote viewer requires the transfer of all polygons before allowing object's manipulation. To avoid this latency problem, an approach is to send several levels of details of the same object so that lighter versions can be displayed sooner and replaced with more detailed version later on. This strategy requires more bandwidth, implies abruptly changes in object aspect as the geometry refines as well as a non negligible precomputing time.Since the appearance of a 3D model is more influenced by its normal field than its geometry, we propose a framework in which the object's LOD is replaced with a single simplified mesh with a LOD of appearance. By using Appearance Preserving Octree-Textures (APO), this appearance LOD is encoded in a unique texture, and the details are progressively downloaded when they are needed. Our APO-based framework achieves a nearly immediate object rendering while details are transmitted and smoothly added to the texture. Scenes keep a low geometry complexity while being displayed at interactive framerate with a maximum of visual details, leading to a better visual quality over bandwith ratio than pure geometric LOD schemes. Our implementation is platform independent, as it uses JOGL and runs on a simple web browser. Furthermore the framework doesn't require processing on the server side during the client rendering. *

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Section: Related Workmentioning

confidence: 99%