split with a plane issue

[Laurent Alebarde]

I am trying to cut a solid with three successive planes like this :

```

import cadquery as cq
from math import sin as sin, pi as pi, atan as atan

r1 = 240

r2 = 250

sabot = cq.Workplane("XY" ) \
    .ellipseArc(x_radius = r1, y_radius = r1, angle1 = 0, angle2 = 20, sense = -1, startAtCurrent = False) \
    .line(10, 0) \
    .center(0, 0) \
    .ellipseArc(x_radius = r2, y_radius = r2, angle1 = 0, angle2 = 20, sense = 1, startAtCurrent = False) \
    .close() \
    .extrude(100) \
    .faces("<Z").transformed(rotate=(5, 0, 0)).split(keepTop=True) \
    .faces("<Z").transformed(rotate=(40, 0, 0)).split(keepBottom=True) \
    .faces("<Z").transformed(rotate=(40, 0, 0), offset=(0, 100, 0)).split(keepTop=True)

It works well with the two first splits:

But not with the 3rd one supposed to be parallel to the second one and offset on y :

Expected result is something like :

[Lorenz]

Try changing the last three lines to:

    .transformed(rotate=(5, 0, 0)).split(keepTop=True) \
    .transformed(rotate=(40, 0, 0)).split(keepBottom=True) \
    .transformed(offset=(0, 0, -40)).split(keepTop=True)


Rotation is not required in the last transformed call since you would like the final split to be parallel (and the workplane is already parallel to the split).

Offset is in the Z because this is the workplane normal direction.

[Laurent Alebarde]

2nd one shouldn't it be then with 35° to obtain 40° ?

For the 3rd one, I have then to correct the offset to take into account the angle of the new reference plane, or is there a way to define the offset in the world coordinate system?

[Lorenz Neureuter]

Yes, 35 for the 2nd rotate if the goal is total of 40.

For the 3rd one maybe something like the following:

offset = sabot.plane.toLocalCoords(cq.Vector(0, 20, 0))
sabot = sabot.transformed(offset=offset).split(keepTop=True)

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[Laurent Alebarde]

Thanks Lorenz. Eventually, I have made the 3rd splitting plan offset perpendicularly to the 2nd one :

```

import cadquery as cq
from math import pi as pi, sin as sin, cos as cos, atan as atan

sabot = cq.Workplane("XY" ) \

    .ellipseArc(x_radius = 240, y_radius = 240, angle1 = 0, angle2 = 30, sense = -1, startAtCurrent = False) \
    .line(10, 0) \
    .center(0, 0) \
    .ellipseArc(x_radius = 250, y_radius = 250, angle1 = 0, angle2 = 30, sense = 1, startAtCurrent = False) \
    .close() \
    .extrude(50) \
    .faces("<Z").workplane().tag("baseplaneSabot") \
    .workplaneFromTagged("baseplaneSabot").transformed(rotate=(5, 0, 0)).split(keepBottom=True) \
    .workplaneFromTagged("baseplaneSabot").transformed(rotate=(30, 0, 0)).split(keepTop=True) \
    .transformed(offset=(0, 0, 20)).split(keepBottom=True)
#    .workplaneFromTagged("baseplaneSabot").transformed(rotate=(30, 0, 0), offset=(0, 0, 40)).split(keepBottom=True)

```