Last Meeting

Agenda 14 Dec 2005

Attending : Roger,Craig, Duygu, Yongang, Daniel Valentino, Alexandre,Jeff, BaeCheol, Byung-Woo Hong, Sesh, Ivo

Email List

Review this week's To Do items:

"+" means "done", "-" means "in progress"

• [-] Craig - Implement EL IFaceSet (CGAL data structure, as used by Alexandre).
• [ ] Craig - Off, Ucf performance issues.
• [ ] Craig - Write OFF writer
• [-] Craig - verify Wiki files are backed and restorable (in progress).
• [ ] Craig - Add sample of ImageIO spi files to ShapeIO tutorial.
• [X] Craig - modify shape.getVertices() to create a PointSet if none already exists.
• [ ] Craig - add an edge set method to count edges w/o respect to orientation
• [X] Craig - add comments to edge set countEdges() to explain how interior edges may appear to be counted twice.
• [-] Jeff - Extend custom color map to change transparency (alpha channel)
• [ ] Jeff - begin working on enabling ShapeViewer to multicast it's transformation matrix to other ShapeViewer instances.
• [ ] Jeff - followup with Jyl to ensure she can use shape viewer.
• [-] Roger - Example JNI interface to ShapeTools

New Items

Discussed

• adding per vertex tranparency support is proving more difficult than originally expected.
• need to set per-shape properties in ShapeViewer, including transform matrices , color maps, and visibility
• java3d makes unusual choices in rendering sequence when drawing partially transparent shapes
• VFSBrowser bugs addressed.
• Need a tool to superimpose both image volume data and shapes abstracted from that volume
• JNI interface is straighforward, tedious, and related to the what needs to be done for RShape
• shape curvature
  • simple curvature estimate class nearly done
  • test shapes generator methods to be merged into ShapeFactory class
  • expected "correct" curvatures of complex surfaces are difficult to calculate algebraically.
• future applications
  • color map editor
  • coordinate transform tool - changes coordinates of shapes, has predefined mappings for defined pairs of applications.
• math primitive needs
  • we need to see requests for basic operations from mathematicians
  • mesh representations
    • find the cell adjacent to the current cell , across a particular boundary
    • need "2nd cousins" of cell - neighbor of neighbors
    • find triangles, vertices, etc. within a particular geodesic distance of vertex or cell
  • level set representations

Decisions

• continue working to set per vertex transparency in ShapeViewer
• cover mathematician needs in next meeting.

To Do for Next Week

• [ ] Craig - circulate operation primitive questionaire to mathematicians
• [ ] Craig - reschedule meetings to Wed, 11a-12p.
• [ ] Craig - Complete CGAL data structure
• [ ] Craig - use CGAL face set in Minc and OFF reader to improve performance
• [ ] Craig - Write OFF writer
• [ ] Craig - verify Wiki files are backed and restorable (in progress).
• [ ] Craig - Add sample of ImageIO spi files to ShapeIO tutorial.
• [ ] Craig - add an edge set method to count edges w/o respect to orientation
• [ ] Craig - collate mathematical primitive needs.
• [ ] Jeff - distribute URL's of java 3d transparency discussions on the web.
• [ ] Jeff - have a way for a user to store and apply a 'preferred view'
• [ ] Jeff - Continue work to apply custom transparencies to vertices (via a color map)
• [ ] Jeff - establish a ShapeViewer preferences file
• [ ] Jeff - add 'preferred view (transformation matrix)' menu to ShapeViewer
• [ ] Jeff - addd per-shape transformation matrix values to scene file.
• [-] Roger - Example JNI interface to ShapeTools
• [ ] BaeCheol - complete curvature calculation class
• [ ] BaeCheol - write methods to create the test shapes used to test curvature.
• [ ] BaeCheol - find. max ht/base ratio of pyramid for which simple curvature is meaningful.