NURBS TODO

Optimize BREP/NURBS ray tracing

• • Benefit: faster ray tracing runtime
  • References:
    • src/librt/primitives/brep
    • src/librt/opennurbs_ext.*

Optimize BREP/NURBS prep

• • Benefit: faster ray tracing runtime, user requested.
    • src/librt/primitives/brep/brep.cpp:rt_brep_prep()
    • src/librt/opennurbs_ext.*

Implicit-to-NURBS

• Implement conversion of implicit primitives to BREP/NURBS primitives.
  • Partially complete, primitives are fixed at origin, some primitives unimplemented.
  • Benefit: partial requirement for interactive visualization of implicit CSG geometry in OpenGL.

BREP/NURBS-to-NMG

• Implement conversion of BREP/NURBS to NMG.
  • Benefit: partial requirement for export and interactive visualization of BREP/NURBS in OpenGL.

BSPLINE/NURBS review

• Identify useful concepts implemented in the old BSPLINE/NURBS code that are not present in openNURBS.
  • Benefit: code reuse, potentially very useful functionality.

BSPLINE/NURBS reuse

• Port any useful BSPLINE/NURBS code to openNURBS data structures and routines.
  • Benefit: code reduction, allows the old BSPLINE/NURBS code to be removed after functionality is migrated.

BREP/NURBS CSG evaluation

• Implement boolean evaluation of BREP/NURBS surfaces.
  • Benefit: partial requirement for interactive visualization of BREP/NURBS in OpenGL.

Plate-mode BREP/NURBS

• Implement plate mode BREP/NURBS objects.
  • Similar, if not identical, to plate mode BoTs, 'brep' objects need the ability to have a thickness described so you could automatically handle non-solid NURBS and sheet-metal style geometry without requiring surface solidity.
  • Benefit: allows for import and visualization of BREP/NURBS surfaces that are not solid.

Implicit CSG to BREP/NURBS CSG test scripts

• Develop test scripts for comparing conversion of implicit CSG to BREP/NURBS CSG
  • Benefit: provides validation and verification via ray tracing.

BREP/NURBS documentation

• Document the new BREP/NURBS primitive.
  • Benefit: provides user documentation explaining capabilities, limitations, and benefits.

Cache objects

• Implement data cache objects.
  • Create new LIBRT API routines for storing cache data in a v5 container. This would amount to storing binary data into a 'binunif' object marked as hidden with attributes for date/time stamping and MD5 or SHA256 checksumming.
  • Benefit: faster ray tracing runtime, applicable to other primitives (NMG, BoT).

Cache prep results

• Cache BREP/NURBS prep results to a specified cache file.
  • Benefit: faster ray tracing runtime for BREP/NURBS, user requested.

BREP/NURBS wireframe

• Improve BREP/NURBS wireframe. Investigate using knots on subcurves.
  • Benefit: faster wireframe, more detailed close wireframes.

BREP/NURBS source code cleanup

• Consolidate Owens and Reeves approaches to ray intersection.
  • Benefit: improved code maintainability.

BREP/NURBS healing

• Implement an rt_heal(rt_db_internal *dbi); routine.
  • The routine tightens up trimming curves and edge/vertex pairings so that they align perfectly while still preserving the topological structure.