Mon, 02/15/2010 - 22:25
Forums:
Hi All,
I was trying to get the Geom_BSplineSurface to generate a B-Spline surface by putting inputs as the control points/ poles, u and v knot, u and v degree.
I do not know how to input knots, as in if it is [0 0 0 1 2 3 3 3] (just an example),
how do I type that in the Geom_BSplineSurface .
Secondly if the knots are as above then is my surface periodic or non periodic.
Thirdly, what would be the multiplicity and how would I write them for the above example.
Thanks a lot in advance
Hope to see some replies soon
God Bless
Tue, 02/16/2010 - 03:13
Hi Jomy,
maybe this helps:
http://www.opencascade.org/org/forum/thread_16829/
Pawel
Tue, 02/16/2010 - 04:49
Thank You
I was successful in creating compiling the Geom_BSplineSurface,
but I do not know how to display the final B_SplineSurface.
I am attaching the code.
This code has 48control points.
8 along U and 6 along V direction.
The degrees in U and V are same = 3
Thanks in Advance
God Bless
Tue, 02/16/2010 - 10:53
Hi,
take a look at BRepBuilderAPI_MakeFace(). After generating the TopoDS_Face you can use AIS to display your surface.
Best regards,
Patrik
Fri, 02/19/2010 - 03:35
Hi
Thanks a lot.
I was also searching for some function that would give me all the bunch of points that are involved in forming the Geom_BSplineSurface.
Surely the number of points will depend on the u and v intervals that I give, but I require these list or data of all the points in order so that I can further perform other operations using them.
Thanks in Advance
God Bless
Fri, 02/19/2010 - 03:52
Hi
I had one more difficulty in display.
It requires for me to change the Geom_BSplineSurface into elementary surfaces which it can detect. Only after which I can apply the functions of BRepBuilderAPI_MakeFace() and TopoDS_Face.
Thanks
God Bless
Mon, 05/23/2016 - 19:54
Hi Permalink, i have been looking at your code and you needed to put these lines
Geom_BSplineSurface *Surf= new Geom_BSplineSurface(poles,UKnots1,VKnots1,UMults,VMults,3,3,Standard_False,Standard_False);
TopoDS_Shape shape= BRepBuilderAPI_MakeShell(Handle_Geom_BSplineSurface(Surf)).Shape();