Summer Work: 3d Viewer Medial Axis Viewer Mesh Editor

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Summer Work3d ViewerMedial Axis ViewerMesh
Editor

• Alexander K. Bowman
• 30 August 2004

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June 2004 3d Viewer

• Need for viewing 3d objects emerged from LEMS
  research
• Shape Representation
• Medical Imaging
• Object Recognition

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3d Viewer Requirements

• Views OpenInventor Files
• Platform Independent
• Easy viewing
• Rotation spin around a focus point
• Zoom get closer to interest point
• Translation pan over an area
• Animation
• Have the scene rotate without interaction
• Seek
• Focus on an object by click
• Orthogonal/Perspective Camera

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3d Viewer Features

• Camera mode
• For changing the view
• Event handled by camera
• Scene graph mode
• For altering the scene
• Event handled by scene graph

Camera Mode
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July 2004 Medial Axis Viewer

• Kimia, Giblin, Leymarie and Chang research on
  Medial Axis representation
• Processing
• G3D (.g3d) data points
• IV (.iv) OpenInventor/VRML
• Pruning
• Matching
• Transition Removal
• Reconstruction
• Smoothing
• Viewing
• G3D, IV, Full Shock, Scaffold

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Full Shock

• Goal Ability to access the underlying data
  structure while viewing
• Keep the data structure and the view separate
• Can interrogate structure to help debug

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August 2004 Mesh Editor

• Reads OpenInventor Files
• IndexedFaceSets
• TriangleStripSets
• Addition
• Deletion
• Interrogation
• Translation

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Extracting individual faces

• Turn one IndexedFaceSet into many

Scene Graph
SoNormal
changes to
SoCoordinate3
SoIndexedFaceSet
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Interrogation

• Interrogating a face tells you its vertices
• Interrogating a vertex tells you how many faces
  its attached to and the position of the vertex

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Deletion

• Deleting a face just removes the face
• Deleting a vertex removes all the attached faces

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Addition

• Add Vertices
• From menu, specify coordinates
• Add Faces
• Click cubes in counterclockwise order
• Face added when you click first vertex again

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Alteration

• Change the position of Vertices

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Saving

• Merged back into SoIndexedFaceSets as previously
  arranged

SoCoordinate3
SoIndexedFaceSet
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Near Future

• Scaffold editor

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The last slide

• Questions?
• Comments?
• Criticisms?