(H)EXASHRINK: MULTIRESOLUTION COMPRESSION OF LARGE STRUCTURED HEXAHEDRAL MESHES WITH DISCONTINUITIES IN GEOSCIENCES Jean-Luc Peyrot, Laurent Duval, Sébastien Schneider Frédéric Payan and Marc Antonini Presented by Shuo Zheng 1 Tuesday, September 27, 2016
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(H)EXASHRINK: MULTIRESOLUTION COMPRESSION OF LARGE STRUCTURED HEXAHEDRAL MESHES
WITH DISCONTINUITIES IN GEOSCIENCES
Jean-Luc Peyrot, Laurent Duval, Sébastien Schneider Frédéric Payan and Marc Antonini
Presented by Shuo Zheng
1 Tuesday, September 27, 2016
Outline
• Introduction
• Contributions
• HexaShrink
• Results
• Conclusion and future works
2 Tuesday, September 27, 2016
Outline
• Introduction
• Contributions
• HexaShrink
• Results
• Conclusion and future works
2 Tuesday, September 27, 2016
Geosciences study Earth’s geological characteristics
Huge heterogeneous mass of information
Geosciences
Types of rocks and fluids
Geological structure
Fluid flow simulation
3 Tuesday, September 27, 2016
Introduction Context of geosciences
Need of a numerical model that gathers information to analyze, process them, and finally make decisions
4 Tuesday, September 27, 2016
Numerical model
Analysis
Prediction
Simulation
Decision
Introduction Context of geosciences (cont.)
Geometry
Properties
5 Tuesday, September 27, 2016
Stratigraphic surface and faults 3D model
Associated properties
Introduction What are geosciences models composed of?
Outline
• Introduction
• Contributions
• HexaShrink
• Results
• Conclusion and future works
6 Tuesday, September 27, 2016
Contributions
Numerical models carry a huge amount of information – Inefficient management, processing, storage and transmission
– Especially with limited memory and bandwidth devices
Reduce the quantity of information, while maintaining coherency and valuable information
HexaShrink: Multiresolution compression to build a hierarchy of geometrical models (aka. meshes) of increasing resolutions
ZCORN can be split into 4 submatrices which contain only the coordinate
of 1 vertex per node among the four ones BDL, FDL, BDR and FDR
Morphological transform is applied separately on each of these
4 submatrices
2D example of morphological transform applied on submatrice BDL
Cell borders Nodes Faults
Z
Outline
• Introduction
• Contributions
• HexaShrink
• Results
• Conclusion and future works
21 Tuesday, September 27, 2016
22 Tuesday, September 27, 2016
Results Visual multiresolution meshes
Original free-fault mesh (Resolution 0)
[80,45,26]
Resolution -1 [40,22,13]
Resolution -2 [20,11,6]
Resolution -3 [10,5,3]
Resolution -4 [5,2,1]
Mesh without faults
23 Tuesday, September 27, 2016
Results Visual multiresolution meshes (cont.)
Original faulted mesh (Resolution 0) [149,189,16]
Resolution -1 [74,94,8]
Resolution -2 [37,47,4]
Resolution -3 [18,23,2]
Resolution -4 [9,11,1]
Mesh with faults…
…preserved across resolutions
24 Tuesday, September 27, 2016
Results Visual multiresolution meshes (cont.)
Original faulted mesh (Resolution 0) [100,100,21]
Resolution -1 [50,50,10]
Resolution -2 [25,25,5]
Resolution -3 [12,12,2]
Resolution -4 [6,6,1]
Mesh with faults
25 Tuesday, September 27, 2016
Results Comparison with JPEG2000 3D*
Original top layer surface
Resolution -2 obtained with JPEG2000 3D Resolution -2 obtained with HexaShrink
*JPEG2000 3D: ITU-T T.809, “JPEG2000 image coding system: Extensions for three-dimensional data” May 2011, ISO/IEC 15444-10:2011
26 Tuesday, September 27, 2016
Results Comparison with JPEG2000 3D* (cont.)
*JPEG2000 3D: ITU-T T.809, “JPEG2000 image coding system: Extensions for three-dimensional data” May 2011, ISO/IEC 15444-10:2011
Outline
• Introduction
• Contributions
• HexaShrink
• Results
• Conclusion and future works
27 Tuesday, September 27, 2016
Conclusion and future works
HexaShrink:
Geometry is well-preserved over the resolutions New lossless progressive compression technique Handles large structured hexahedral meshes having
discontinuities Can be used to speed-up the simulation time (upscaling
for instance) Extend this technique to unstructured or even hybrid volume meshes Compression of properties Article is being written at Computational Geosciences Journal