Creating fillets with OCP

ocp-fillet-corner.py

#!/usr/bin/python

######################################################################
#  Example of how to use ChFi2d_FilletAPI to create fillets.
#
#  2024-03-14 Thu
#  Dov Grobgeld <[email protected]>
#
#  This file is in the public domain
######################################################################

import OCP
from OCP.ChFi2d import ChFi2d_FilletAPI
from OCP.gp import gp,gp_Pnt,gp_Dir,gp_Ax1,gp_Ax2,gp_Trsf,gp_Vec,gp_Pln
from OCP.BRepBuilderAPI import (BRepBuilderAPI_MakeEdge,
                                BRepBuilderAPI_MakeWire,
                                BRepBuilderAPI_MakeFace,
                                )
from OCP.BRepPrimAPI import BRepPrimAPI_MakePrism
import cadquery as cq  # Just for display of the output

# Input consists of a triangle. We want to fillet
# the corner at aPnt2
aPnt1 = gp_Pnt(0,0,0)
aPnt2 = gp_Pnt(5,5,0)
aPnt3 = gp_Pnt(10,0,0)

seg1 = BRepBuilderAPI_MakeEdge(aPnt1,aPnt2).Edge()
seg2 = BRepBuilderAPI_MakeEdge(aPnt2,aPnt3).Edge()
seg3 = BRepBuilderAPI_MakeEdge(aPnt3,aPnt1).Edge()

# Create the fillet maker
aPln = gp_Pln()

fillet_maker = ChFi2d_FilletAPI(seg1, seg2, aPln)
radius = 2
ok = fillet_maker.Perform(radius)
print(f'{ok=}')

# The res returns the result, and seg1 and seg2 are modified
# due to the fillet
res = fillet_maker.Result(aPnt2, seg1, seg2)
print(f'{res=}')

# Build a wire with the result
mkWire = BRepBuilderAPI_MakeWire(seg1,res,seg2,seg3)
myWireProfile = mkWire.Wire()

# Create a solid body in order to easily export the result
# and use cad query's stl output.

# Body : Prism the Profile
myFaceProfile = BRepBuilderAPI_MakeFace(myWireProfile).Face()
aPrismVec = gp_Vec(0, 0, 1)
res = BRepPrimAPI_MakePrism(myFaceProfile, aPrismVec).Shape()

comp = cq.Compound.makeCompound(cq.occ_impl.shapes.Solid(res))
comp.exportStl('fillet-edge.stl')

print('ok')