Shape Representation Conversions

Attending:

Tentative Agenda

• Review of past project notes
• Project Purpose and Vision
• Data types to support
• Conversions to perform
• Requirements
• Scheduling

Discussed

• Purpose of project: Translate between different shape representations
• definition of signed distance function (sdf).
  • sdf is equivalent to a mesh, within a specific resolution.
  • voxels with value "0" are part of mesh surface.
  • voxel absolute values are distance from nearest point of mesh surface
  • sign of voxel values (+/-) indicate whether voxel on interior or exterior of surface
• Narrow-Band (sparse) signed distance fields.
• Requirements
  • File format must be separate from internal shape representation.
  • Meshes to be converted into sdf must be oriented.
• Who will use this tool
  • Duygu
  • Yongang
  • a Math graduate student
• Possible 7 month outline
  • 2 wk: project proposal to Toga
  • 3 mo: prototype : prototype app to translate between mesh and sdf
  • 4 mo: library framework to generalize diff. types of meshes and sdf's.
  • 5 mo: releasable application
  • 5 mo: Analysis pipline using application
  • 7 mo: 2 papers using these methods (1 from mesh to sdf, 1 from sdf to mesh)
• do we need more programming support ?

Decisions

• support only triangular meshes
• Prototype will translate between a trianglar mesh and a signed distance function.

To do

• define and describe users for whom this is intended.
• define signed distance function.
• define 1 (triangular) mesh representation.
• decide if unoriented mesh's will be supported.
• decide how to define distance function .
  • coordinate system
  • volume size (dimensions)
  • voxel size (resolution)
  • conventions for sign of interior, surface and exterior.
• decide which file formats to (initially) support