CopyTrimmed

RhinoCommon:

to be updated:
CreateTrimmedSurface or CopyTrimCurves may be what you are looking for
M_Rhino_Geometry_Brep_CreateTrimmedSurface.htm
M_Rhino_Geometry_Brep_CopyTrimCurves.htm

Keep tracking the new release of RhinoCommon for the Brep attributes for additional parametric control.



Rhino 4.0 .NET SDK:
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OnBrep copyTrimmedPattern(OnBrep source, OnSurface target)
{
  OnBrep brep = new OnBrep(source);
  if((brep.m_F.Count() == 1) && target != null)
  {
    OnBrepFace face = brep.m_F[0];

    OnSurface surface = target.DuplicateSurface();
    int index = brep.AddSurface(surface);
    face.ChangeSurface(index);

    if (brep.RebuildEdges(ref face, 0.001, true, true))
     {
      brep.CullUnusedSurfaces();
    }

  }
  return brep;
}
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2010 0810 CopyTrim: