NURBS, Non-Uniform Rational
B-Splines, are mathematical representations of 3-D geometry that can
accurately describe any shape from a simple 2-D line, circle, arc, or
spline curve to the most complex 3-D organic free-form surface or solid.
Because of their
flexibility and accuracy, NURBS models can be used everywhere from
illustration and animation to manufacturing.
NURBS is the best 3-D modeling
technology for designers. They can capture and refine ideas and
accurately communicate them through every step to manufacturing. With
NURBS, designers can model any shape from a simple 2-D arc to the most
complex 3-D organic free-form surface, or solid.
Because of their accuracy,
NURBS can be used in any process from drafting, illustration, and
animation to analysis and manufacturing.
Since NURBS is proven
technology, it is used by most design, drafting, CAM, engineering,
prototyping, analysis, rendering, animation, and illustration software.
For more details, see these
books and papers.
Who designed the file
format and developed the toolkit?
McNeel. The toolkit is
currently being used by Rhino and over 4,500 other developers.
What is in the file
It is the complete Rhino file
format, which includes NURBS curves, surfaces, and solids, annotation,
images, and meshes. These data
types can accurately hold all of the 3-D geometry found in most other
CAD/CAM file formats including IGES, STEP, VDA/FS, ACIS, Parasolid, etc.
Who is funding the
openNURBS Initiative and why?
Robert McNeel & Associates.
They feel that the 3-D market is stifled because of the inability to
reliably transfer 3-D geometry between applications. The problem is too
big for us to solve alone. By funding the operating cost of openNURBS,
others will get involved in the toolkit design and development. It will
be a much cheaper and effective way to solve the problem.