Summer Work: 3d Viewer Medial Axis Viewer Mesh Editor Alexander K. Bowman 30 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 Graph Mode

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 SoCoordinate3 SoNormal SoIndexedFaceSet changes to SoIndexedFaceSets SoCoordinate3 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 SoIndexedFaceSets SoCoordinate3 SoIndexedFaceSet Merged back into SoIndexedFaceSets as previously arranged

Near Future Scaffold editor

The last slide Questions? Comments? Criticisms?