def import_step(self, fn):
"""
Import a STEP file generated by the OpenVSP.
:param str fn: The full path to the file.
:return: None.
:raise RuntimeError: If the file cannot be read.
"""
print('Importing OpenVSP STEP file...')
# Build a compound for geometric sets
compound = TopoDS_Compound()
BRep_Builder().MakeCompound(compound)
# Read file
step_reader = STEPControl_Reader()
status = step_reader.ReadFile(fn)
if status not in [IFSelect_RetVoid, IFSelect_RetDone]:
raise RuntimeError("Unable to read OpenVSP STEP file.")
# TODO Convert to desired units
# Interface_Static.SetCVal_("xstep.cascade.unit", "SOME UNIT HERE")
# Transfer
# OpenVSP STEP files result in one root and one shape (a compound)
step_reader.TransferRoot(1)
master_shape = step_reader.Shape(1)
# Iterate over master shape to find compounds for geometric sets. These
# sets contain the surfaces that make up the component.
iterator = TopoDS_Iterator(master_shape, True, True)
more = True
while iterator.More() and more:
print('--Processing a component...')
# The compound
compound = iterator.Value()
# Hack to handle single component for now...
if compound.ShapeType() != TopAbs_COMPOUND:
compound = master_shape
more = False
solid, is_valid, invalid_shapes = _build_solid(
compound, self._divide)
if is_valid:
print(' Successfully built a solid.')
self._solids.append(solid)
else:
print(' Failed to build a valid solid.')
self._invalid.append(solid)
self._invalid_shapes += invalid_shapes
# Next shape
iterator.Next()
print('Finished.\n')
def shape_iter(self):
"""
:return: Yield the underlying sub-shape(s).
:rtype: collections.Iterable(afem.topology.entities.Shape)
"""
it = TopoDS_Iterator(self.object)
while it.More():
yield Shape.wrap(it.Value())
it.Next()
def _process_solid(self, shape, color_tool):
shapes = []
color = self._get_color(shape, color_tool)
it = TopoDS_Iterator()
it.Initialize(shape, False, False)
while it.More():
#shapes.append(TopoShape(shape=shape, color=color))
shapes.extend(self._process_shell(it.Value(), color_tool, color))
it.Next()
return shapes
def dumpTopology(shape, level=0):
"""
Print the details of an object from the top down
"""
brt = BRep_Tool()
s = shape.ShapeType()
if s == TopAbs_VERTEX:
pnt = brt.Pnt(topods_Vertex(shape))
print(".." * level + "<Vertex %i: %s %s %s>" %
(hash(shape), pnt.X(), pnt.Y(), pnt.Z()))
else:
print(".." * level, end="")
print(shapeTypeString(shape))
it = TopoDS_Iterator(shape)
while it.More():
shp = it.Value()
it.Next()
dumpTopology(shp, level + 1)
def _topods_iterator_check(shape, check):
"""
Iterate on the shape and print errors and store invalid shapes.
"""
invalid = []
it = TopoDS_Iterator(shape)
while it.More():
sub_shape = it.Value()
result = check.Result(sub_shape)
list_of_status = result.Status()
for status in list_of_status:
if status != BRepCheck_NoError:
msg = ' {0}-->{1}'.format(status, sub_shape.ShapeType())
print(msg)
invalid.append(sub_shape)
it.Next()
invalid += _topods_iterator_check(sub_shape, check)
return invalid
def _process_shape(self, shape, color_tool):
shapes = []
shape_type = shape.ShapeType()
print("Process {}".format(shape_type))
if shape_type in (TopAbs_COMPOUND, TopAbs_COMPSOLID):
it = TopoDS_Iterator()
it.Initialize(shape, False, False)
while it.More():
shapes.extend(self._process_shape(it.Value(), color_tool))
it.Next()
elif shape_type == TopAbs_SOLID:
shapes.extend(self._process_solid(shape, color_tool))
elif shape_type == TopAbs_SHELL:
shapes.extend(self._process_shell(shape, color_tool))
elif shape_type == TopAbs_FACE:
shapes.append(self._process_face(shape, color_tool))
else:
color = self._get_color(shape, color_tool)
shapes.append(TopoShape(shape=shape, color=color))
return shapes
def intersection(self, shape):
""" Returns the resulting intersection of this and the given shape
or None.
"""
op = BOPAlgo_Section()
op.AddArgument(self.shape)
op.AddArgument(shape)
op.Perform()
if op.HasErrors():
return
r = op.Shape()
if r.IsNull():
return
n = r.NbChildren()
if n == 0:
return
it = TopoDS_Iterator(r)
results = []
while it.More():
results.append(Topology.cast_shape(it.Value()))
it.Next()
return results