Difference between revisions of "NURBS Booleans"
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| + | =NURBS Intersections= | ||
| + | |||
| + | {| border=1 align="right" | ||
| + | !Impact | ||
| + | !Difficulty | ||
| + | |- | ||
| + | |high | ||
| + | |hard | ||
| + | |} | ||
| + | |||
Non-Uniform Rational B-Splines are the dominant geometric representation format in Computer Aided Design. BRL-CAD's support for these primitives is relatively recent, and while we can raytrace them we do not have the ability to perform operations such as surface/surface intersection calculations. These abilities are fundamental to a wide variety of editing operations and essential to the process of converting implicit-primitive based boolean geometry trees to evaluated NURBS models. | Non-Uniform Rational B-Splines are the dominant geometric representation format in Computer Aided Design. BRL-CAD's support for these primitives is relatively recent, and while we can raytrace them we do not have the ability to perform operations such as surface/surface intersection calculations. These abilities are fundamental to a wide variety of editing operations and essential to the process of converting implicit-primitive based boolean geometry trees to evaluated NURBS models. | ||
This task would target the problem of implementing an algorithm to calculate surface/surface intersection for general NURBS surfaces. These guys implemented something very similar although their implementation was not robust: http://www.cs.unc.edu/~geom/CSG/boole.html These guys followed that work and implemented a robust solution, but killed performance: http://www.cs.unc.edu/~geom/ESOLID/ You will need to be very careful about tolerances and tolerance tracking without resorting to fixed-precision arithmetic. There are a variety of other research papers on the surface/surface intersection problem - students interested in this topic should discuss it with developers on the IRC channel or via email. | This task would target the problem of implementing an algorithm to calculate surface/surface intersection for general NURBS surfaces. These guys implemented something very similar although their implementation was not robust: http://www.cs.unc.edu/~geom/CSG/boole.html These guys followed that work and implemented a robust solution, but killed performance: http://www.cs.unc.edu/~geom/ESOLID/ You will need to be very careful about tolerances and tolerance tracking without resorting to fixed-precision arithmetic. There are a variety of other research papers on the surface/surface intersection problem - students interested in this topic should discuss it with developers on the IRC channel or via email. | ||
| − | Requirements | + | ==References== |
| + | |||
| + | * src/librt/primitives/brep | ||
| + | * src/librt/primitives/bspline | ||
| + | * src/other/openNURBS | ||
| + | * src/librt/opennurbs_ext.* | ||
| + | * include/opennurbs_ext.h | ||
| + | * include/raytrace.h | ||
| + | * include/rtgeom.h | ||
| + | |||
| + | ==Requirements== | ||
*Familiarity with C++ | *Familiarity with C++ | ||
*Solid mathematical foundations | *Solid mathematical foundations | ||
| − | |||
| − | |||
Revision as of 08:30, 24 March 2011
NURBS Intersections
| Impact | Difficulty |
|---|---|
| high | hard |
Non-Uniform Rational B-Splines are the dominant geometric representation format in Computer Aided Design. BRL-CAD's support for these primitives is relatively recent, and while we can raytrace them we do not have the ability to perform operations such as surface/surface intersection calculations. These abilities are fundamental to a wide variety of editing operations and essential to the process of converting implicit-primitive based boolean geometry trees to evaluated NURBS models.
This task would target the problem of implementing an algorithm to calculate surface/surface intersection for general NURBS surfaces. These guys implemented something very similar although their implementation was not robust: http://www.cs.unc.edu/~geom/CSG/boole.html These guys followed that work and implemented a robust solution, but killed performance: http://www.cs.unc.edu/~geom/ESOLID/ You will need to be very careful about tolerances and tolerance tracking without resorting to fixed-precision arithmetic. There are a variety of other research papers on the surface/surface intersection problem - students interested in this topic should discuss it with developers on the IRC channel or via email.
References
- src/librt/primitives/brep
- src/librt/primitives/bspline
- src/other/openNURBS
- src/librt/opennurbs_ext.*
- include/opennurbs_ext.h
- include/raytrace.h
- include/rtgeom.h
Requirements
- Familiarity with C++
- Solid mathematical foundations
