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CadQuery
Shell Broken for Loft Objects
This issue began over on the Google Group here. I'm posting it here so we can keep track of it.
Shelling works fine with the cube example in the documentation.
result = cq.Workplane("XY").box(2, 2, 2) \
.faces(">Z") \
.shell(-0.2)
But no combination of face selections or shell thicknesses seems to be able to make this work.
import cadquery as cq
from Helpers import show
result = cq.Workplane("front").circle(1.5) \
.workplane(offset=3.0).rect(0.75, 0.5).loft(combine=True) \
.faces("-Z").shell(-0.1)
show(result)
I used the old show function in that example because it provides a stack trace, whereas CQGI's show_object function does not.
Here's the main error I get.
BRep_API: command not doneRunning the Python command 'CadQueryExecuteScript' failed:
Traceback (most recent call last):
File "/home/jwright/.FreeCAD/Mod/cadquery_module/CQGui/Command.py", line 226, in Activated
imp.load_source('temp_module', tempFile.name)
File "/tmp/tmphTKlY4", line 6, in <module>
.faces("-Z").shell(-0.1)
File "/home/jwright/.FreeCAD/Mod/cadquery_module/Libs/cadquery/cadquery/cq.py", line 820, in shell
s = solidRef.shell(self.objects, thickness)
File "/home/jwright/.FreeCAD/Mod/cadquery_module/Libs/cadquery/cadquery/freecad_impl/shapes.py", line 1009, in shell
return Shape.cast(self.wrapped.makeThickness(nativeFaces, thickness, tolerance))
BRep_API: command not done
Looks like a problem with the cad kernel. Did you try with a different loft based model?
Using CQ2.4.0 this problem seems still to be present. Should this ticket be reopened?
Maybe it's a regression in OpenCASCADE. I can also reproduce in CQ commit 551a23157026faef423e7cb7caaf6f84da91a562 (Jan 30) with OCP 7.7.2.
Doesn't work for me as well (cadquery==2.4.0)
wall_thickness = 2.0
## radius
circle_inner = 39.0 / 2.0
box_x_outer = 34.6
box_y_outer = 17.1
box_height = 30.0
funnel_height = 50.0
circle_outer = circle_inner + 2 * wall_thickness
box_x_inner = box_x_outer - 2 * wall_thickness
box_y_inner = box_y_outer - 2 * wall_thickness
result = (
cq.Workplane("front")
.rect(box_x_outer, box_y_outer)
#.faces(">Z")
#.circle(circle_outer)
.workplane(offset=funnel_height)
.circle(circle_outer)
.loft(combine=True)
.shell(-2)
)
display(result)
Oddly enough it works if I use a shell between two circles the same size e.g. a cylinder, but made via the loft tool.
