Summer Work:3d Viewer

Medial Axis ViewerMesh Editor

Alexander K. Bowman30 August 2004

June 2004: 3d Viewer

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

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

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

Scene GraphMode

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

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

August 2004: Mesh Editor

• Reads OpenInventor Files– IndexedFaceSets– TriangleStripSets

• Addition• Deletion• Interrogation• Translation

Extracting individual faces

Scene Graph

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SoIndexedFaceSetsSoCoordinate3

• Turn one IndexedFaceSet into many

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

Deletion• Deleting a face just

removes the face• Deleting a vertex removes

all the attached faces

Addition• Add Vertices

– From menu, specify coordinates• Add Faces

– Click cubes in counterclockwise order– Face added when you click first vertex

again

Alteration

• Change the position of Vertices

Saving

SoIndexedFaceSetsSoCoordinate3 SoC

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• Merged back into SoIndexedFaceSets as previously arranged

Near Future

• Scaffold editor

The last slide

• Questions?• Comments?• Criticisms?