def makeSAG(sketch, zBot, zMid, zTop, tIn, tOut, offset=0.):
doc = FreeCAD.ActiveDocument
# First, compute the geometric quantities we will need:
a = zTop - zMid # height of the top part
b = tOut + tIn # width of one of the trianglular pieces of the top
alpha = np.abs(np.arctan(a / np.float(b))) # lower angle of the top part
c = a + 2 * offset # height of the top part including the offset
# horizontal width of the trianglular part of the top after offset
d = c / np.tan(alpha)
# horizontal shift in the triangular part of the top after an offset
f = offset / np.sin(alpha)
sketchList = splitSketch(sketch)
returnParts = []
for tempSketch in sketchList:
# TODO: right now, if we try to taper the top of the SAG wire to a point, this
# breaks, since the offset of topSketch is empty. We should detect and handle this.
# For now, just make sure that the wire has a small flat top.
botSketch = draftOffset(tempSketch, offset) # the base of the wire
midSketch = draftOffset(tempSketch, f + d - tIn) # the base of the cap
topSketch = draftOffset(tempSketch, -tIn + f) # the top of the cap
delete(tempSketch) # remove the copied sketch part
# Make the bottom wire:
rectPartTemp = extrude(botSketch, zMid - zBot)
rectPart = copy_move(rectPartTemp, moveVec=(0., 0., zBot - offset))
delete(rectPartTemp)
# make the cap of the wire:
topSketchTemp = copy_move(topSketch, moveVec=(
0., 0., zTop - zMid + 2 * offset))
capPartTemp = doc.addObject('Part::Loft', sketch.Name + '_cap')
capPartTemp.Sections = [midSketch, topSketchTemp]
capPartTemp.Solid = True
doc.recompute()
capPart = copy_move(capPartTemp, moveVec=(0., 0., zMid - offset))
delete(capPartTemp)
delete(topSketchTemp)
delete(topSketch)
delete(midSketch)
delete(botSketch)
returnParts += [capPart, rectPart]
returnPart = genUnion(returnParts, consumeInputs=True
if not DBG_OUT else False)
return returnPart
def makeSAG(sketch, zBot, zMid, zTop, tIn, tOut, offset=0.0):
doc = FreeCAD.ActiveDocument
assert zBot <= zMid
assert zMid <= zTop
# First, compute the geometric quantities we will need:
a = zTop - zMid # height of the top part
b = tOut + tIn # width of one of the triangular pieces of the top
# if there is no slope to the roof, it's a different geometry which we don't handle:
assert not np.isclose(
b, 0
), "Either overshoot or inner displacement values need to be non-zero for SAG \
(otherwise use extrude)"
# This also means there would be no slope to the roof:
assert not np.isclose(
a, 0
), "Top and middle z values need to be different for SAG (otherwise use extrude)."
alpha = np.arctan(a / b) # lower angle of the top part
c = a + 2 * offset # height of the top part including the offset
# horizontal width of the trianglular part of the top after offset
d = c / np.tan(alpha)
# horizontal shift in the triangular part of the top after an offset
f = offset * (1 - np.cos(alpha)) / np.sin(alpha)
sketchList = splitSketch(sketch)
returnParts = []
for tempSketch in sketchList:
botSketch = draftOffset(tempSketch, offset) # the base of the wire
midSketch = draftOffset(tempSketch, f + d - tIn) # the base of the cap
top_offset = f - tIn
topSketch = draftOffset(tempSketch, top_offset) # the top of the cap
# If topSketch has been shrunk exactly to a line or a point, relax the offset to 5E-5. Any closer and FreeCAD seems to suffer from numerical errors
if topSketch.Shape.Area == 0:
top_offset -= 5e-5
delete(topSketch)
topSketch = draftOffset(tempSketch, top_offset)
delete(tempSketch) # remove the copied sketch part
# Make the bottom wire:
if zMid - zBot != 0:
rectPartTemp = extrude(botSketch, zMid - zBot)
rectPart = copy_move(rectPartTemp,
moveVec=(0.0, 0.0, zBot - offset))
delete(rectPartTemp)
else:
rectPart = None
# make the cap of the wire:
topSketchTemp = copy_move(topSketch,
moveVec=(0.0, 0.0, zTop - zMid + 2 * offset))
capPartTemp = doc.addObject("Part::Loft", f"{sketch.Name}_cap")
capPartTemp.Sections = [midSketch, topSketchTemp]
capPartTemp.Solid = True
doc.recompute()
capPart = copy_move(capPartTemp, moveVec=(0.0, 0.0, zMid - offset))
delete(capPartTemp)
delete(topSketchTemp)
delete(topSketch)
delete(midSketch)
delete(botSketch)
returnPart = (genUnion([capPart, rectPart],
consumeInputs=True if not DBG_OUT else False)
if rectPart is not None else capPart)
returnParts.append(returnPart)
return returnParts
