Building a Brep in RhinoCommon

emilio morello wrote:

Hi,
I am trying to define a new Brep object in RhinoCommon, following this Dale's C++ sample

... but it looks like I'm missing something.
This is the code that gives me an invalid brep:
It should trim a PlaneSurface by an ArcCurve (a circle)

import Rhino
import math

def main():

# define surface
surf = Rhino.Geometry.PlaneSurface(
Rhino.Geometry.Plane.WorldXY,
Rhino.Geometry.Interval( -100, 100 ),
Rhino.Geometry.Interval( -100, 100 ) )

# draw surface
Rhino.RhinoDoc.ActiveDoc.Objects.AddSurface( surf )

# define outer curve
circ = Rhino.Geometry.Circle( 75 )
curve3d = Rhino.Geometry.ArcCurve( circ )

# draw outer curve
Rhino.RhinoDoc.ActiveDoc.Objects.AddCurve( curve3d )
Rhino.RhinoDoc.ActiveDoc.Views.Redraw()

# get curve 2D
tolr = Rhino.RhinoDoc.ActiveDoc.ModelAbsoluteTolerance
curve2d = surf.Pullback( curve3d, tolr )
vertexpnt = curve3d.PointAtStart

# surface orientation
backsurf = False

# curve orientation
backedge = False

# build brep:
rep = Rhino.Geometry.Brep()
# add vertex
vertex = rep.Vertices.Add(
vertexpnt, Rhino.RhinoMath.UnsetValue )
vertexindex = vertex.VertexIndex
# add curve 3D
cur3dindex = rep.AddEdgeCurve( curve3d )
# add edge
edge = rep.Edges.Add(
vertexindex, vertexindex, cur3dindex, Rhino.RhinoMath.UnsetValue )
# add surface
surfindex = rep.AddSurface( surf )
# add face
face = rep.Faces.Add( surfindex )
# add loop
loop = rep.Loops.Add( Rhino.Geometry.BrepLoopType.Outer, face )
# add curve 2D
cur2dindex = rep.AddTrimCurve( curve2d )
# add trim
trim = loop.Trims.Add( edge, backedge, loop, cur2dindex )
trim.IsoStatus = Rhino.Geometry.IsoStatus.None
trim.TrimType = Rhino.Geometry.BrepTrimType.Boundary
trim.SetTolerances( Rhino.RhinoMath.UnsetValue, Rhino.RhinoMath.UnsetValue )
# set surface orientation
face.OrientationIsReversed = backsurf

print 'Brep is valid: %s' % str( rep.IsValid )

main()

Any advise to help me find the error(s) ?
Thanks

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