[kuczmas]

Dear forumers!

I want to create a NURBS surface from a cloud of points, using the least squares method. As far as I am concerned, such capabilities are available in libnurbs++ library, which I downloaded from:
http://libnurbs.sourceforge.net/old/index.shtml
Even I managed to compile it, after some manipulations.
I wanted to ask if anyone used this library to create and manipulate nurbs surfaces? Any help would be much appreciated!

Thanks in advance!

[olivierG]

hello,

I have not tested by myself, but you may take a look at MeshLab.

regards,
olivier

[hannes]

Hello,

I have used it in for creating surfaces from sample points.
For visualization and further processing I convert the resulting data into OpenCASCADE data structures.
Initially, I tried to do the job using OpenCASCADE interpolation functions, but nurbs++ work a lot better for this.

Regards, Hannes

[kuczmas]

Many thanks for quick reply!

Hannes, this is exactly what I intend to do, but I have got some problems just at the beginning during compilation of the library (I have gcc 4.4.3). The error message is the following:

d_surface.cpp:29: error: explicit instantiation of 'class  BasicList<PLib::InterPoint<double, 2> >' in namespace 'PLib'  (which does not enclose namespace '::')
d_surface.cpp:30: error: explicit instantiation of 'class  BasicList<PLib::InterPoint<double, 3> >' in namespace 'PLib'  (which does not enclose namespace '::')

When I erase those lines in the d_surface.cpp file, the compilation of the library goes fine. But then when I try to compile a simple program, which uses libnurbs, then I got the following error:

/home/pakuc/libnurbs/lib/libnurbsd.so: undefined reference to `BasicList<PLib::InterPoint<double, 2> >::add(PLib::InterPoint<double, 2> const&)'
/home/pakuc/libnurbs/lib/libnurbsd.so: undefined reference to `BasicList<PLib::InterPoint<double, 2> >::reset()'
/home/pakuc/libnurbs/lib/libnurbsd.so: undefined reference to `BasicList<PLib::InterPoint<double, 3> >::reset()'
/home/pakuc/libnurbs/lib/libnurbsd.so: undefined reference to `BasicList<PLib::InterPoint<double, 3> >::add(PLib::InterPoint<double, 3> const&)'

So it seems that lines which include BasicList<>::... functions can not be simply ommited. I've heard that there are some compilation issues of the libnurbs library with newer versions of gcc. Have you encountered simillar problems?

[hannes]

Hello Pawel,

If I remember right, I didn't compile it myself but installed a *.deb-Package from the "cae-team" ppa.

I guess, it was this: https://launchpad.net/~cae-team/+archive/ppa

Regards, Hannes

[Bandfrosch]

Hello Pawel,

you may also try this patch for nurbs++.
It makes gcc version 4.6.2 on OpenSUSE happy.
All is based on the Zip file found here:
http://libnurbs.sourceforge.net/old/index.shtml


* copy libnurbs++-3.0.11.patch.gz to the nurbs++ source directory
* gunzip it
* apply patch ( in terminal )

patch -p0 < libnurbs++-3.0.11.patch

* rebuild nurbs++ via make

Good luck !

[kuczmas]

Thanks for help!

I have successfully installed the libnurbs++ from ppa archive and it works fine :-).

[kuczmas]

Dear All,

What now I intend to do is to visualize the geometry, created by libnurbs++. I know there is an openGL extension to that library. I have encountered a problem when compiling a sample program topengl (which is provided with the libnurbs++ library), which uses some functions from rnubsGL.h file. The error message is the following:

g++ -m64 -Dlinux64 -DWM_DP -Wall -Wextra -Wno-unused-parameter -Wold-style-cast -Wnon-virtual-dtor -O0 -fdefault-inline -ggdb3 -DFULLDEBUG -DNoRepository -ftemplate-depth-40 -I/usr/include/nurbs++ -IlnInclude -I. -I/opt/openfoam171/src/OpenFOAM/lnInclude -I/opt/openfoam171/src/OSspecific/POSIX/lnInclude   -fPIC Make/linux64GccDPDebug/my_topengl_v01.o -L/opt/openfoam171/lib/linux64GccDPDebug \
         -L/usr/lib     -lmatrix     -lmatrixI     -lmatrixN     -lnurbsd     -lnurbsf     -lGL     -lGLU     -lglut -lOpenFOAM -liberty -ldl  -ggdb3 -DFULLDEBUG -lm -o /home/pakuc/OpenFOAM/pakuc-1.7.1/applications/bin/linux64GccDPDebug/my_opengl_v01
Make/linux64GccDPDebug/my_topengl_v01.o: In function `NurbsViewer::initNurbsObjects(GLUnurbs*)':
/home/pakuc/OpenFOAM/pakuc-1.7.1/applications/my_tests/my_topengl_v01/my_topengl_v01.cpp:47: undefined reference to `PLib::NurbsCurveGL::read(std::basic_ifstream<char, std::char_traits<char> >&)'
/home/pakuc/OpenFOAM/pakuc-1.7.1/applications/my_tests/my_topengl_v01/my_topengl_v01.cpp:54: undefined reference to `PLib::NurbsCurveGL::read(std::basic_ifstream<char, std::char_traits<char> >&)'
Make/linux64GccDPDebug/my_topengl_v01.o: In function `NurbsViewer::display()':
/home/pakuc/OpenFOAM/pakuc-1.7.1/applications/my_tests/my_topengl_v01/my_topengl_v01.cpp:94: undefined reference to `PLib::NurbsSurfaceGL::gluNurbs() const'
Make/linux64GccDPDebug/my_topengl_v01.o: In function `NurbsCpolygonGL':
/usr/include/nurbs++/nurbsGL.h:691: undefined reference to `PLib::ObjectGL::ObjectGL()'
/usr/include/nurbs++/nurbsGL.h:691: undefined reference to `vtable for PLib::NurbsCpolygonGL'
/usr/include/nurbs++/nurbsGL.h:691: undefined reference to `PLib::cPolygonColorDefault'
Make/linux64GccDPDebug/my_topengl_v01.o: In function `NurbsSpolygonGL':
/usr/include/nurbs++/nurbsGL.h:707: undefined reference to `PLib::ObjectGL::ObjectGL()'
/usr/include/nurbs++/nurbsGL.h:707: undefined reference to `vtable for PLib::NurbsSpolygonGL'
/usr/include/nurbs++/nurbsGL.h:707: undefined reference to `PLib::cPolygonColorDefault'
Make/linux64GccDPDebug/my_topengl_v01.o: In function `~BoundingBoxGL':
/usr/include/nurbs++/nurbsGL.h:722: undefined reference to `vtable for PLib::BoundingBoxGL'
/usr/include/nurbs++/nurbsGL.h:722: undefined reference to `PLib::ObjectGL::~ObjectGL()'
Make/linux64GccDPDebug/my_topengl_v01.o: In function `~NurbsGL':
/usr/include/nurbs++/nurbsGL.h:747: undefined reference to `vtable for PLib::NurbsGL'
/usr/include/nurbs++/nurbsGL.h:747: undefined reference to `PLib::ObjectListGL::~ObjectListGL()'
/usr/include/nurbs++/nurbsGL.h:747: undefined reference to `PLib::ObjectListGL::~ObjectListGL()'
/usr/include/nurbs++/nurbsGL.h:747: undefined reference to `PLib::ObjectListGL::~ObjectListGL()'
/usr/include/nurbs++/nurbsGL.h:747: undefined reference to `PLib::ObjectListGL::~ObjectListGL()'
/usr/include/nurbs++/nurbsGL.h:747: undefined reference to `PLib::ObjectGL::~ObjectGL()'
/usr/include/nurbs++/nurbsGL.h:747: undefined reference to `PLib::ObjectGL::~ObjectGL()'
Make/linux64GccDPDebug/my_topengl_v01.o: In function `NurbsCurveGL':
/usr/include/nurbs++/nurbsGL.h:834: undefined reference to `PLib::NurbsGL::NurbsGL()'
/usr/include/nurbs++/nurbsGL.h:834: undefined reference to `vtable for PLib::NurbsCurveGL'
/usr/include/nurbs++/nurbsGL.h:834: undefined reference to `vtable for PLib::NurbsCurveGL'
Make/linux64GccDPDebug/my_topengl_v01.o: In function `NurbsSurfaceGL':
/usr/include/nurbs++/nurbsGL.h:872: undefined reference to `PLib::NurbsGL::NurbsGL()'
/usr/include/nurbs++/nurbsGL.h:872: undefined reference to `vtable for PLib::NurbsSurfaceGL'
/usr/include/nurbs++/nurbsGL.h:872: undefined reference to `vtable for PLib::NurbsSurfaceGL'
Make/linux64GccDPDebug/my_topengl_v01.o: In function `~NurbsSurfaceGL':
/usr/include/nurbs++/nurbsGL.h:877: undefined reference to `vtable for PLib::NurbsSurfaceGL'
/usr/include/nurbs++/nurbsGL.h:877: undefined reference to `vtable for PLib::NurbsSurfaceGL'
Make/linux64GccDPDebug/my_topengl_v01.o: In function `~NurbsCurveGL':
/usr/include/nurbs++/nurbsGL.h:832: undefined reference to `vtable for PLib::NurbsCurveGL'
/usr/include/nurbs++/nurbsGL.h:832: undefined reference to `vtable for PLib::NurbsCurveGL'
collect2: ld returned 1 exit status
make: *** [/home/pakuc/OpenFOAM/pakuc-1.7.1/applications/bin/linux64GccDPDebug/my_opengl_v01] Błąd 1

Has anyone used openGL together with libnurbs++? Hannes, have you used openGL, or exlusively openCASCADE for visualization?