Sweep or extrude flips the object when plane is 45 degrees

[Jopie01]

I walk into the situation where I do a sweep or extrude from a plane which has an angle of 45 degrees. At that moment the object is flips. Use the code below for reproduction.

import cadquery as cq
from math import radians, cos, sin

length = 1000 # mm
angle = 48 # degrees <--- play with this use 45 and 45.1 to see the flip
angle_radian = radians(angle)

path = (cq.Workplane("YZ")
    .lineTo(length * cos(angle_radian), length * sin(angle_radian))
)

plane = cq.Plane(origin=path.val().startPoint(), normal=path.val().tangentAt(1))

plate = (cq.Workplane(plane)
    .lineTo(0, 155)
    .lineTo(5, 155)
    .lineTo(5, 5)
    .lineTo(140, 5)
    .lineTo(140, 0)
    .close()
)
#res = plate.sweep(path)
res = plate.extrude(length)
show_object(res)

I draw a line with an angle and put a plane at the startpoint which is normal to that line. Then I use that plane to draw a L-shaped sketch and sweep it or extrude it. In both cases the result its flipped.

[lorenzncode]

xDir is optional when creating the plane. It is computed automatically if not specified.

https://github.com/CadQuery/cadquery/blob/33f72d2e5747d7996c5d789c55e2febe6b5d2167/cadquery/occ_impl/geom.py#L565-L567

Try with explicit xDir:

plane = cq.Plane(
    origin=path.val().startPoint(),
    xDir=(1, 0, 0),
    normal=path.val().tangentAt(0),
)

[Jopie01]

Indeed, using explicitly the xDir, everything stays where it should be.

Thanks again.