Hi Dalton,
Sorry my github example wasn't clear. I'm not sure exactly what you sent to
TopoDS_face and BRepBuilderAPI_MakeFace, but I got it to work. I
used the BSplineSurface in src/examples/Geometry/geometry_demos.py and
successfully wrote a STEP file. My changes have a #CSS comment nearby.
See below, particularly the topodsface line.
I suspect you didn't use the .GetHandle() method or the .Shape() method,
but I can't be sure without seeing your code.
- Charles
"""
Modification of src/examples/Geometry/geometry_demos.py to
demonstrate STEP conversion of Geom_BSplineSurface
"""
from OCC.gp import *
from OCC.Geom import *
from OCC.TColGeom import *
from OCC.TColgp import *
from OCC.GeomConvert import *
from OCC.BRepBuilderAPI import *
from OCC.TopoDS import *
from OCC.STEPControl import *
def bezier_surfaces(event=None):
#display.EraseAll() # CSS
array1 = TColgp_Array2OfPnt (1,3,1,3)
array2 = TColgp_Array2OfPnt (1,3,1,3)
array3 = TColgp_Array2OfPnt (1,3,1,3)
array4 = TColgp_Array2OfPnt (1,3,1,3)
array1.SetValue(1,1,gp_Pnt(1,1,1))
array1.SetValue(1,2,gp_Pnt(2,1,2))
array1.SetValue(1,3,gp_Pnt(3,1,1))
array1.SetValue(2,1,gp_Pnt(1,2,1))
array1.SetValue(2,2,gp_Pnt(2,2,2))
array1.SetValue(2,3,gp_Pnt(3,2,0))
array1.SetValue(3,1,gp_Pnt(1,3,2))
array1.SetValue(3,2,gp_Pnt(2,3,1))
array1.SetValue(3,3,gp_Pnt(3,3,0))
array2.SetValue(1,1,gp_Pnt(3,1,1))
array2.SetValue(1,2,gp_Pnt(4,1,1))
array2.SetValue(1,3,gp_Pnt(5,1,2))
array2.SetValue(2,1,gp_Pnt(3,2,0))
array2.SetValue(2,2,gp_Pnt(4,2,1))
array2.SetValue(2,3,gp_Pnt(5,2,2))
array2.SetValue(3,1,gp_Pnt(3,3,0))
array2.SetValue(3,2,gp_Pnt(4,3,0))
array2.SetValue(3,3,gp_Pnt(5,3,1))
array3.SetValue(1,1,gp_Pnt(1,3,2))
array3.SetValue(1,2,gp_Pnt(2,3,1))
array3.SetValue(1,3,gp_Pnt(3,3,0))
array3.SetValue(2,1,gp_Pnt(1,4,1))
array3.SetValue(2,2,gp_Pnt(2,4,0))
array3.SetValue(2,3,gp_Pnt(3,4,1))
array3.SetValue(3,1,gp_Pnt(1,5,1))
array3.SetValue(3,2,gp_Pnt(2,5,1))
array3.SetValue(3,3,gp_Pnt(3,5,2))
array4.SetValue(1,1,gp_Pnt(3,3,0))
array4.SetValue(1,2,gp_Pnt(4,3,0))
array4.SetValue(1,3,gp_Pnt(5,3,1))
array4.SetValue(2,1,gp_Pnt(3,4,1))
array4.SetValue(2,2,gp_Pnt(4,4,1))
array4.SetValue(2,3,gp_Pnt(5,4,1))
array4.SetValue(3,1,gp_Pnt(3,5,2))
array4.SetValue(3,2,gp_Pnt(4,5,2))
array4.SetValue(3,3,gp_Pnt(5,5,1))
BZ1, BZ2, BZ3, BZ4 =
Geom_BezierSurface(array1),Geom_BezierSurface(array2),Geom_BezierSurface(arr
ay3),Geom_BezierSurface(array4)
bezierarray = TColGeom_Array2OfBezierSurface(1,2,1,2)
bezierarray.SetValue(1,1,BZ1.GetHandle())
bezierarray.SetValue(1,2,BZ2.GetHandle())
bezierarray.SetValue(2,1,BZ3.GetHandle())
bezierarray.SetValue(2,2,BZ4.GetHandle())
BB = GeomConvert_CompBezierSurfacesToBSplineSurface(bezierarray)
if BB.IsDone():
poles = BB.Poles().GetObject().Array2()
uknots = BB.UKnots().GetObject().Array1()
vknots = BB.VKnots().GetObject().Array1()
umult = BB.UMultiplicities().GetObject().Array1()
vmult = BB.VMultiplicities().GetObject().Array1()
udeg = BB.UDegree()
vdeg = BB.VDegree()
BSPLSURF = Geom_BSplineSurface( poles, uknots, vknots, umult, vmult,
udeg, vdeg, 0, 0 )
BSPLSURF.Translate(gp_Vec(0,0,2))
#display.DisplayShape(make_face(BSPLSURF.GetHandle()), update=True ) #
CSS
# Start CSS
topodsface = TopoDS_face(BRepBuilderAPI_MakeFace(BSPLSURF.GetHandle(),
1e-6).Shape())
c = STEPControl_Controller()
c.Init()
w = STEPControl_Writer()
okay = w.Transfer(topodsface, STEPControl_AsIs)
w.Write('surface.stp')
# End CSS
if __name__ == '__main__':
bezier_surfaces()
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