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“Contrast Displays: An Interactive Haptic and Visual Interface for Mesh Quality Analysis” Lisa Durbeck, M.S. C.S.Thesis. Reproduced with permission from http://www.scs.leeds.ac.uk/cpde/knock.html. 3D unstructured tetrahedral mesh. Approach: reduce mesh to a handful of elements - PowerPoint PPT Presentation
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“Contrast Displays: An Interactive Haptic and Visual
Interface for Mesh Quality Analysis”
Lisa Durbeck, M.S. C.S.Thesis
Reproduced with permission from http://www.scs.leeds.ac.uk/cpde/knock.html
3D unstructured tetrahedral mesh
Process
My Interface
16,000-element mesh,16,000 error values
How good is this mesh?Where are the bad elements?
Why are they bad?
Approach:
• reduce mesh to a handful of elements
• interaction model is compare/contrast
• compare geometry, compare error level
• visual comparison info: color, shape
• haptic comparison info: texture
• provide analytic information in a Closeup view
• what matters: size, shape, orientation of tet. and its neighbors
colors
0.02 - 0.03
0.01 - 0.019
0.0 - 1e-6
geometrical considerations: shape, size, location, face orientation
force feedback
force
0.16
-0.16 Distance: 0 to 6 cycles/mm
comparative information
High Level:Mesh Geometry
Why are they bad? Present Spatial Distribution ofError as movie
Local Level: tetrahedronerror is a function of
Local View centered about aparticular tetrahedron
shape Drawing Tets as Solids
shape Exploded View
size do nothing
orientation rotation of Exploded View
orientation Displaying Axes
error at neighbors showing neighbors
error at neighbors providing control of coloring
error at neighbors rotations of exploded view
Depends OnQuestion Interface to Question
Problem/SolutionMesh Geometry
Where are the worst meshtetrahedra?
Present Spatial Distribution oferror as movie
Global view with User-Controlled Subsetting in the
error domain
Default to worst 2% oftetrahedra
order via color, texture map
Software System Development
HAPTICS
GRAPHICS
ADAPTIVE MESHGENERATION
ERROR ESTIMATION
INTERPROCESSCOMMUNICATION
TETRAD
TETRAD
SCIRun
SCIRun, GHOST SDK
C
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