Ok. I suppose I figured the right way of doing it from an example here<http://www.pythonizer.org/pythoncascade/gallery/toptra5.htm> .
The transform should be created like this: xform = gp_GTrsf() xform.SetVectorialPart(gp_Mat( 1.5, 0, 0, 0, 1, 0, 0, 0, 1, )) brep = BRepBuilderAPI_GTransform(shape, xform, False) This creates results as expected, without any extra polygons. -- Jayesh On Sat, Nov 26, 2011 at 12:35 PM, Jayesh Salvi <jayeshsa...@gmail.com>wrote: > Hi, > > I am trying to do scale a Shape only along selective dimensions and I see > some unwanted polygons in the result. Here is a sample code to reproduce > what I am seeing. It creates a cylinder and then scales it along X-axis. > Then I export it as STL and view it in meshlab to find some extra polygons > on the side. I am attaching the screenshot of stl. (source file also > available > here<https://github.com/jayesh3/cadmium/blob/master/examples/pythonocc/scale-problem.py> > ) > > > from OCC.BRepPrimAPI import BRepPrimAPI_MakeCylinder > > from OCC.BRepBuilderAPI import BRepBuilderAPI_GTransform > > from OCC.gp import gp_GTrsf, gp_Trsf > > from OCC.Precision import Precision_Angular, Precision_Confusion > > from OCC import StlAPI > > > > shape = BRepPrimAPI_MakeCylinder(20,40).Shape() > > > > xform = gp_Trsf() > > xform.SetValues( > > 1.5, 0, 0, 0, > > 0, 1, 0, 0, > > 0, 0, 1, 0, > > Precision_Angular(), Precision_Confusion() > > ); > > brep = BRepBuilderAPI_GTransform(shape, gp_GTrsf(xform), False) > > brep.Build() > > shape = brep.Shape() > > > > > > stl_writer = StlAPI.StlAPI_Writer() > > stl_writer.Write(shape, 'scaled-cylinder.stl') > > > > What am I doing wrong? Or is this a problem in OCC scaling algorithm? > > Thanks, > -- > Jayesh >
_______________________________________________ Pythonocc-users mailing list Pythonocc-users@gna.org https://mail.gna.org/listinfo/pythonocc-users
