def _build_solid(compound, divide_closed):
"""
Try to build a solid from the OpenVSP compound of faces.
:param afem.topology.entities.Compound compound: The compound.
:param bool divide_closed: Option to divide closed faces.
:return: The solid.
:rtype: afem.topology.entities.Solid
"""
# Get all the faces in the compound. The surfaces must be split. Discard
# any with zero area.
faces = []
for face in compound.faces:
area = SurfaceProps(face).area
if area > 1.0e-7:
faces.append(face)
# Replace any planar B-Spline surfaces with planes.
non_planar_faces = []
planar_faces = []
for f in faces:
srf = f.surface
try:
pln = srf.as_plane()
if pln:
w = f.outer_wire
# Fix the wire because they are usually degenerate edges in
# the planar end caps.
builder = BRepBuilderAPI_MakeWire()
for e in w.edges:
if LinearProps(e).length > 1.0e-7:
builder.Add(e.object)
w = builder.Wire()
fix = ShapeFix_Wire()
fix.Load(w)
fix.SetSurface(pln.object)
fix.FixReorder()
fix.FixConnected()
fix.FixEdgeCurves()
fix.FixDegenerated()
w = Wire(fix.WireAPIMake())
fnew = Face.by_wire(w)
planar_faces.append(fnew)
else:
non_planar_faces.append(f)
except RuntimeError:
logger.info('Failed to check for planar face...')
non_planar_faces.append(f)
# Make a compound of the faces
shape = Compound.by_shapes(non_planar_faces + planar_faces)
# Split closed faces
if divide_closed:
shape = DivideClosedShape(shape).shape
# Sew shape
sewn_shape = SewShape(shape).sewed_shape
if isinstance(sewn_shape, Face):
sewn_shape = sewn_shape.to_shell()
# Attempt to unify planar domains
shell = UnifyShape(sewn_shape).shape
# Make solid
if not isinstance(shell, Shell):
logger.info('\tA valid shell was not able to be generated.')
check = CheckShape(shell)
if not check.is_valid:
logger.info('\tShape errors:')
check.log_errors()
return shell, check.invalid_shapes
solid = Solid.by_shell(shell)
# Limit tolerance
FixShape.limit_tolerance(solid)
# Check the solid and attempt to fix
invalid = []
check = CheckShape(solid)
if not check.is_valid:
logger.info('\tFixing the solid...')
solid = FixShape(solid).shape
check = CheckShape(solid)
if not check.is_valid:
logger.info('\t...solid could not be fixed.')
logger.info('\tShape errors:')
check.log_errors()
failed = check.invalid_shapes
invalid += failed
else:
tol = solid.tol_avg
logger.info(
'\tSuccessfully generated solid with tolerance={}'.format(tol))
return solid, invalid
def _build_solid(compound, divide_closed):
"""
Method to try and build a valid solid from an OpenVSP component.
"""
# Get all the faces in the compound. The surfaces must be split. Discard
# any with zero area.
top_exp = TopExp_Explorer(compound, TopAbs_FACE)
faces = []
while top_exp.More():
shape = top_exp.Current()
face = CheckShape.to_face(shape)
fprop = GProp_GProps()
BRepGProp.SurfaceProperties_(face, fprop, 1.0e-7)
a = fprop.Mass()
if a <= 1.0e-7:
top_exp.Next()
continue
faces.append(face)
top_exp.Next()
# Replace any planar B-Spline surfaces with planes
non_planar_faces = []
planar_faces = []
for f in faces:
hsrf = BRep_Tool.Surface_(f)
try:
is_pln = GeomLib_IsPlanarSurface(hsrf, 1.0e-7)
if is_pln.IsPlanar():
w = ShapeAnalysis.OuterWire_(f)
# Fix the wire because they are usually degenerate edges in
# the planar end caps.
builder = BRepBuilderAPI_MakeWire()
for e in ExploreShape.get_edges(w):
if LinearProps(e).length > 1.0e-7:
builder.Add(e)
w = builder.Wire()
fix = ShapeFix_Wire()
fix.Load(w)
geom_pln = Geom_Plane(is_pln.Plan())
fix.SetSurface(geom_pln)
fix.FixReorder()
fix.FixConnected()
fix.FixEdgeCurves()
fix.FixDegenerated()
w = fix.WireAPIMake()
# Build the planar face
fnew = BRepBuilderAPI_MakeFace(w, True).Face()
planar_faces.append(fnew)
else:
non_planar_faces.append(f)
except RuntimeError:
non_planar_faces.append(f)
# Make a compound of the faces
shape = CreateShape.compound(non_planar_faces + planar_faces)
# Split closed faces
if divide_closed:
divide = ShapeUpgrade_ShapeDivideClosed(shape)
divide.Perform()
shape = divide.Result()
# Sew shape
sew = BRepBuilderAPI_Sewing(1.0e-7)
sew.Load(shape)
sew.Perform()
sewn_shape = sew.SewedShape()
if sewn_shape.ShapeType() == TopAbs_FACE:
face = sewn_shape
sewn_shape = TopoDS_Shell()
builder = BRep_Builder()
builder.MakeShell(sewn_shape)
builder.Add(sewn_shape, face)
# Attempt to unify planar domains
unify_shp = ShapeUpgrade_UnifySameDomain(sewn_shape, False, True, False)
unify_shp.Build()
shape = unify_shp.Shape()
# Make solid
shell = ExploreShape.get_shells(shape)[0]
solid = ShapeFix_Solid().SolidFromShell(shell)
# Limit tolerance
FixShape.limit_tolerance(solid)
# Check shape validity
check_shp = BRepCheck_Analyzer(solid, True)
if check_shp.IsValid():
return solid, True, []
else:
invalid_shapes = _topods_iterator_check(solid, check_shp)
return solid, False, invalid_shapes