Mon, 10/23/2000 - 09:31
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Hi everybody, i might not understand all correctly, but is there support for nurbs surfaces in open cascade ? if not, are there plans to support them in the future ? so long florian
Collaborative development portal
Mon, 10/23/2000 - 10:25
Hi !
Yes nurbs are supported ny OpenCascade, for example the Geom_BSplineSurface will do it.
A nurb is just a special case of a spline surface, to put it simple a nurb surface is a spline surface with none rational control points, you do this by adding "weights" to the control points, for an ordinary spline surface all the weights are 1.
Mikael
Mon, 10/23/2000 - 14:00
Hi again !
Hmmm, I was in a hurry the last time, and the description I gave is not very correct, sorry.
A nurb is a Non Uniform Rational Bspline curve to be correct, non uniform means that the knot span between two knots may not be uniform through the knot vector, and a rational curve/surface is when you have weights <> 1.0, if you do this then it becomes a nurb curve/surface. And all this is supported by the spline curves in Open Cascade.
Use SetWeight/Weight to set/get the weights.
Mikael