Hi Thomas, This is very cool. I am interested in OCC as a 'model builder' for use with an electromagnetic simulation package I am writing. An important stage in this is the meshing of the model - so you've already started doing my work :-)
Also thanks for the Python/C++ note - I'm beginning to understand why so many people get excited by Python, the syntax here seems very intuitive. PythonOCC is shaping into a very nice package indeed! Arthur Thomas Paviot wrote: > Dear all, > > Here is another pythonOCC sample: a simple mesher. To run this sample, > you need the latest python svn revision (at least 198), because it uses > the 'Standard_Integer & transformation function' I told you in my > previous mail. This introduces a *major* difference between OpenCascade > C++ programming and pythonOCC. > > In C++, there is a method to pass parameters to a function named 'by > reference'. It means, for instance, that if you want to get the value of > 3 integers, you can do: > int a=2; > int b=3; > in c=4; > Get(a,b,c); > > After the call of the function Get, the values of a, b and c have changed. > > It's not possible in python. For instance, if you do: > a = 1 > b = 2 > c = 3 > Get(a,b,c) > print "a=%i"a > print "b=%i"%b > print "b=%i"%b > > You will *always* have the following result: > a=1 > b=2 > c=3 > > OpenCascade makes intensive use of this way to pass parameters to > functions. For instance, in the Poly_Triangle class, you have a method > Get that takes 3 integers by reference. As it's not possible to use > "as-is" in Python, this method requires a tranformation(done in SWIG): > it takes no parameters and returns the 3 integers. > - In C++: > Standard_Integer index1; > Standard_Integer index2; > Standard_Integer index3; > myTriangle.Get(index1, index2, index3); > - In Python: > index1 , index2, index3 = myTriangle.Get() #function transformed, > take no parameters, return 3 ints > > Note: it's exatcly the same for the Coord() method of the class gp_Pnt: > - In C++: > Standard_Real X; > Standard_Real Y; > Standard_Real Z; > myPoint.Coord(X,Y,Z); > - In Python: > X, Y, Z = myPoint.Coord() > > Sorry for this very technical point, but you could have been confused if > reading OpenCascade documentation and trying to use methods that take > Standard_Integer or Standard_Real parameters by reference. > > Best Regards, > > Thomas > > > > _______________________________________________ Pythonocc-users mailing list Pythonocc-users@gna.org https://mail.gna.org/listinfo/pythonocc-users
