Wire extraction after MakeFillet2d not following the Face #1275
Description
Hello,
I have a model with a Wire and need to add a fillet to the Wire. To do this, a Face is created from the Wire, the Face is filleted and the outer wire of this filleted face is extracted. When the face has some 'concavity' (better said the center of the arc is outside the face), as illustrated below, the resulting Wire does not follow the Face contour. It looks like the wire is flipped locally. Is it the expected behavior? Any idea to fix that?
- Pink : wires before fillet
- Grey : face after fillet
- Blue: wire extraction after fillet (not following the face)
Code to produce the picture above:
from OCC.Core.BRepBuilderAPI import (BRepBuilderAPI_MakeVertex,\
BRepBuilderAPI_MakeEdge,BRepBuilderAPI_MakeWire,BRepBuilderAPI_MakeFace)
from OCC.Core.BRepFilletAPI import BRepFilletAPI_MakeFillet2d
from OCC.Core.TopExp import TopExp_Explorer
from OCC.Core.TopAbs import TopAbs_WIRE
from OCC.Core.BRepTools import breptools
from OCC.Core.gp import gp_Pnt
from OCC.Display.WebGl.jupyter_renderer import JupyterRenderer
coords=[
(0, 50, 0),
(50,50, 0),
(50,25, 0),
(80,25, 0),
(80,0, 0),
(0,0, 0)
]
# Create vertices
vertices=list()
for coord in coords:
vertices.append( BRepBuilderAPI_MakeVertex(gp_Pnt(*coord)).Shape() )
# Join vertices to create a closed loop of edges
nv=len(vertices)
edges=list()
for i in range(0,nv,1):
if i<nv-1:
edge=BRepBuilderAPI_MakeEdge(vertices[i],vertices[i+1]).Shape()
elif i==nv-1:
edge=BRepBuilderAPI_MakeEdge(vertices[i],vertices[0]).Shape()
else:
raise ValueError('Out of bounds, i=',i)
edges.append(edge)
# Create the wire and the corresponding face
a_maker = BRepBuilderAPI_MakeWire()
for edge in edges:
a_maker.Add(edge)
a_maker.Build()
original_topods_wire=a_maker.Shape()
OnlyPlane = True
a_maker = BRepBuilderAPI_MakeFace(original_topods_wire,OnlyPlane)
a_maker.Build()
a_topods_face = a_maker.Shape()
# Make Fillet
a_maker=BRepFilletAPI_MakeFillet2d(a_topods_face)
a_maker.AddFillet(vertices[2],10)
a_maker.Build()
a_topods_face=a_maker.Shape()
# Get the wire out of the face
option=1
if option==0:
an_explorer=TopExp_Explorer(a_topods_face,TopAbs_WIRE)
i=0
while an_explorer.More():
print(i)
a_topods_wire=an_explorer.Value()
an_explorer.Next()
i=i+1
elif option==1:
a_topods_wire=breptools.OuterWire(a_topods_face)
my_renderer = JupyterRenderer()
my_renderer.DisplayShape(original_topods_wire, render_edges=True,update=False,edge_color='magenta')
my_renderer.DisplayShape(a_topods_wire, render_edges=True,update=False)
my_renderer.DisplayShape(a_topods_face, render_edges=False,update=True)