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Asymmetric Chamfer Error #786

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gumyr opened this issue Jun 9, 2021 · 6 comments · May be fixed by #1579
Open

Asymmetric Chamfer Error #786

gumyr opened this issue Jun 9, 2021 · 6 comments · May be fixed by #1579

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@gumyr
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gumyr commented Jun 9, 2021

Asymmetric chamfer is not applied consistently. The chamfers on the top of this ring look correct; however, the inner chamfer on the bottom is reversed.
chamferBug

Error found on cadquery master.

import cadquery as cq

chamferBody = (
    cq.Workplane("XY")
    .circle(8)
    .circle(4)
    .extrude(4)
    .faces(">Z").chamfer(0.5,1.5)
    .faces("<Z").chamfer(0.5,1.5)
)
if "show_object" in locals():
    show_object(chamferBody,name="chamferBody")
@adam-urbanczyk
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The order of the asymmetric chamfer is not well defined in general (I think that it depends on the orientation of the underlying wires).

@gumyr
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gumyr commented Jun 9, 2021

I wondered if the cause of this issue was due to the difference in direction of the circular wires of the top and bottom of the doughnut hole. Is there anyway to make the result more predictable?

@adam-urbanczyk
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Not that I know at the moment.

@ksuszka
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ksuszka commented Mar 25, 2023

I think I encountered the same issue on other simple example.

    cq.Workplane()
    .box(10,10,10)
    .faces("<Z")
    .workplane()
    .rect(20,1)
    .cutThruAll()
    .faces("<Z")
    .chamfer(1.5,0.5)

chamfer_on_splitted_box

@kolod
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kolod commented Apr 28, 2024

One more example:

from cadquery import Workplane

for i, query in enumerate(["<X", ">X", "<Y", ">Y", "<Z", ">Z"]):
    result = Workplane(origin=(i*15.0,0,0)).box(10,10,10).faces(query).chamfer(2,1)
    show_object(result)

image

@kolod
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kolod commented Apr 28, 2024 •
edited

I think the problem in edge normals.

from cadquery import Workplane
from typing import List, cast
from cadquery.occ_impl.shapes import Edge, Face

c1 = Workplane().box(10, 10, 10).faces("<Y")
print(cast(Face, c1.vals()[0]).normalAt())
for x in cast(List[Edge], c1.faces("<Y").edges().vals()):
    print(x.normal())
Vector: (-0.0, -1.0, -0.0) # Face
Vector: (-0.0, 1.0, 0.0)
Vector: (1.0, 0.0, -0.0)
Vector: (-0.0, 1.0, 0.0)
Vector: (1.0, 0.0, -0.0)

And if add wire() nothing changes.

c2 = Workplane().box(10, 10, 10).faces("<Y")
for x in cast(List[Edge], c2.faces("<Y").edges().wire().vals()):
    print(x.normal())

@kolod kolod linked a pull request May 1, 2024 that will close this issue
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Closes #786 Asymmetric Chamfer Error kolod/cadquery
4 participants
@ksuszka @adam-urbanczyk @kolod @gumyr