NURBS TODO

Optimize BREP/NURBS ray tracing[edit]

  • Benefit: faster ray tracing runtime, user visible
  • Time Estimate: 2 days
  • References:
    • src/librt/primitives/brep
    • src/librt/opennurbs_ext.*

Optimize BREP/NURBS prep[edit]

  • Benefit: faster ray tracing runtime, user requested, user visible
  • Time Estimate: 2 days
  • References:
    • src/librt/primitives/brep/brep.cpp:rt_brep_prep()
    • src/librt/opennurbs_ext.*

Implicit-to-NURBS[edit]

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
  • Time Estimate: 3 days
  • References:
    • src/librt/primitives/${PRIM}/${PRIM}_brep.cpp

BREP/NURBS-to-NMG[edit]

Implement conversion of BREP/NURBS to NMG.

  • Benefit: requirement for polygonal export, partial requirement for OpenGL visualization, user visible
  • Time Estimate: 1 day
  • References:
    • src/librt/primitives/brep/brep.cpp:rt_brep_tess()

BSPLINE/NURBS review[edit]

Identify useful concepts implemented in the old BSPLINE/NURBS code that are not present in openNURBS.

  • Benefit: code reuse, potentially very useful functionality.
  • Time Estimate: <1 day
  • References:
    • src/librt/primitives/bspline/*

BSPLINE/NURBS reuse[edit]

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.
  • Time Estimate: 2 days
  • References:
    • src/librt/primitives/bspline/*
    • src/librt/primitives/brep/*

BREP/NURBS CSG evaluation[edit]

Implement boolean evaluation of BREP/NURBS surfaces.

Plate-mode BREP/NURBS[edit]

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, user visible
  • Time Estimate: 2 days
  • References:
    • include/rtgeom.h
    • src/librt/primitives/bot/bot.c

Implicit CSG to BREP/NURBS CSG test scripts[edit]

Develop test scripts for comparing conversion of implicit CSG to BREP/NURBS CSG

  • Benefit: provides validation and verification via ray tracing.
  • Time Estimate: < 1 day
  • References:
    • regress/*.sh
    • sh/*.sh

BREP/NURBS documentation[edit]

Document the new BREP/NURBS primitive (user overviewdocumentation: how to import, use, export, limitations).

  • Benefit: provides user documentation explaining capabilities, limitations, and benefits; user visible
  • Time Estimate: 3 days
  • References:
    • doc/docbook/articles

Cache objects[edit]

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)
  • Time Estimate: 1 day
  • References:
    • include/raytrace.h
    • include/db5.h
    • src/librt/binunif
    • src/librt/primitives/*

Raytrace prep cache optimization[edit]

Cache BREP/NURBS prep results to a specified cache file.

  • Benefit: faster ray tracing runtime for BREP/NURBS, user requested, user visible
  • Time Estimate: 2 days
  • References:
    • src/librt/primitives/table.c

BREP/NURBS wireframe[edit]

Improve BREP/NURBS wireframe. Investigate using knots on subcurves.

BREP/NURBS source code cleanup[edit]

Consolidate Owens and Reeves approaches to ray intersection.

BREP/NURBS healing[edit]

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.

  • Benefit: more robust evaluation for improved (more stable & consistent) raytracing, import, export; routine interface later applicable to NMG/BoT too
  • Time Estimate: 3 days
  • References:
    • src/librt/primitives/brep

Report on using BREP/NURBS for analysis[edit]

Description needed here.

  • Benefit: documentation, user visible
  • Time Estimate: 3 days
  • References:
    • doc/docbook/articles

Analytic comparison of BREP/NURBS and BoT[edit]

Description needed here.

  • Benefit:
  • Time Estimate: 1 day
  • References:
    • sh/*.sh
    • regress/*.sh
    • bench/run.sh

Analytic comparison of BREP/NURBS CSG and implicit CSG[edit]

Description needed here.

  • Benefit:
  • Time Estimate: 2 days
  • References:
    • sh/*.sh
    • regress/*.sh
    • bench/run.sh