def _makeSlice(self, shapeToSlice, zLevel):
s = Slice()
#used to determine if a slice is identical to others.
s.hatchDir = self.hatchReversed
s.fillWidth = self.options.filling.fillWidth
#change if layers are variable thickness
s.sliceHeight = self.options.layerHeight
s.zLevel = zLevel
#make a cutting plane
p = gp.gp_Pnt(0, 0, zLevel)
origin = gp.gp_Pnt(0, 0, zLevel - 1)
csys = gp.gp_Ax3(p, gp.gp().DZ())
cuttingPlane = gp.gp_Pln(csys)
bff = BRepBuilderAPI.BRepBuilderAPI_MakeFace(cuttingPlane)
face = bff.Face()
#odd, a halfspace is faster than a box?
hs = BRepPrimAPI.BRepPrimAPI_MakeHalfSpace(face, origin)
hs.Build()
halfspace = hs.Solid()
#make the cut
bc = BRepAlgoAPI.BRepAlgoAPI_Cut(shapeToSlice, halfspace)
cutShape = bc.Shape()
foundFace = False
for face in Topo(cutShape).faces():
if self._isAtZLevel(zLevel, face):
foundFace = True
log.debug("Face is at zlevel" + str(zLevel))
s.addFace(face)
#TestDisplay.display.showShape(face);
log.debug("Face" + str(face))
if self.options.useSliceFactoring:
mySum = s.getCheckSum()
#print 'Slice Created, Checksum is',mySum;
for otherSlice in self.slices:
#print "Slice Checksum=",otherSlice.getCheckSum();
if mySum == otherSlice.getCheckSum():
log.info(
"This slice matches another one exactly. using that so we can save time."
)
return otherSlice.copyToZ(zLevel)
if not foundFace:
log.warn("No faces found after slicing at zLevel " + str(zLevel) +
" !. Skipping This layer completely")
return None
else:
return s
def _makeSlice(self, shapeToSlice, zLevel):
s = Slice()
#change if layers are variable thickness
s.sliceHeight = self.sliceHeight
s.zLevel = zLevel
#make a cutting plane
p = gp.gp_Pnt(0, 0, zLevel)
origin = gp.gp_Pnt(0, 0, zLevel - 1)
csys = gp.gp_Ax3(p, gp.gp().DZ())
cuttingPlane = gp.gp_Pln(csys)
bff = BRepBuilderAPI.BRepBuilderAPI_MakeFace(cuttingPlane)
face = bff.Face()
#odd, a halfspace is faster than a box?
hs = BRepPrimAPI.BRepPrimAPI_MakeHalfSpace(face, origin)
hs.Build()
halfspace = hs.Solid()
#make the cut
bc = BRepAlgoAPI.BRepAlgoAPI_Cut(shapeToSlice, halfspace)
cutShape = bc.Shape()
#search the shape for faces at the specified zlevel
texp = TopExp.TopExp_Explorer()
texp.Init(cutShape, TopAbs.TopAbs_FACE)
foundFace = False
while (texp.More()):
face = ts.Face(texp.Current())
if self._isAtZLevel(zLevel, face):
foundFace = True
logging.debug("Face is at zlevel" + str(zLevel))
s.addFace(face, self.saveSliceFaces)
texp.Next()
#free memory
face.Nullify()
bc.Destroy()
texp.Clear()
texp.Destroy()
if not foundFace:
logging.warn("No faces found after slicing at zLevel " +
str(zLevel) + " !. Skipping This layer completely")
return None
else:
return s
def makeSection(self, cuttingPlane, shapeToSection, zLevel):
"""
Uses halfspaces to make a cut.
"""
bff = BRepBuilderAPI.BRepBuilderAPI_MakeFace(cuttingPlane)
face = bff.Face()
origin = gp.gp_Pnt(0, 0, zLevel - 1)
#odd, a halfspace is faster than a box?
hs = BRepPrimAPI.BRepPrimAPI_MakeHalfSpace(face, origin)
hs.Build()
halfspace = hs.Solid()
#make the cut
bc = BRepAlgoAPI.BRepAlgoAPI_Cut(self.solid.shape, halfspace)
cutShape = bc.Shape()
ff = []
for face in Topo(cutShape).faces():
if OCCUtil.isFaceAtZLevel(zLevel, face):
ff.append(face)
return ff
