CAD Working Group Strategy

CAD Working Group Strategy

• Build examples of X3D CAD models to provide use cases and use case and best practices.
• Preserve product structure in CAD node name fields and metadata.
  • Resist the urge to refactor CAD product nodes, unless a clear improvement in CAD consistency is shown. Preferred is good practices rather than restrictions that are difficult to enforce.
  • Goals
    • Primary goal. CAD definitions converted to X3D geometry, preferring parametric representations for brevity and precision.
    • Secondary goal. Option to save CAD product structure in the use of named X3D CAD product structure nodes, with addition of embedded typed metadata nodes.
    • Third goal. Define, implement, demonstrate and distribute the workflow for converting CAD models to X3D.
• Next steps for activity.
  • Compare vocabularies for ISO STEP, Macro Parametric Approach, B-REPS (general definitions) and B-REPS (proposed X3D nodes).
  • For each table row, define corresponding mappings to existing parametric X3D nodes (e.g. NURBS, extrusion, primitives).
  • Consider implementing these BREPS nodes as NURBS-based X3D prototypes
  • These prototypes are an independent implementation that make it easy for either authors or browser to use such BREPS nodes
  • Can also update the support for these nodes in Xj3D open source
  • List all pros/cons of BREPS nodes as first-class X3D v3.4 nodes
  • At this point it is much easier to decide whether to add BREPS to X3D