def replace_splitted_faces(builder, shape, old_face, splitted_faces):
"""
Try to create new shape that does not include old_face, but it
includes instead splitted_faces
"""
old_points = points_of_face(old_face)
sewing = BRepBuilderAPI_Sewing(0.01, True, True, True, False)
sewing.SetFloatingEdgesMode(True)
# Get list of all faces in shape
primitives = brep_explorer.shape_disassembly(shape)
obsolete_face_found = False
# This loop tries to add original not-splitted faces to sewing
for face_shape in primitives[4].values():
new_points = points_of_face(face_shape)
# Quick Python trick using sets: all points in new_points
# has to be included in old_points.
# Note: may be, it is not 100% reliable, but for all uses cases it just works.
old_set = set(old_points)
new_set = set(new_points)
if not old_set <= new_set:
old_face = topods_Face(face_shape)
sewing.Add(old_face)
else:
obsolete_face_found = True
# When no face for replacement was found, then
# return origin unchanged shape
if obsolete_face_found is not True:
return shape
# This loop adds splitted faces to sewing
for face_shape in splitted_faces:
old_face = topods_Face(face_shape)
sewing.Add(old_face)
# Sew all faces together
sewing.Perform()
sewing_shape = sewing.SewedShape()
# When there is hole in sewing, then following function will be terminated with Error.
# Do not use try-except to solve this problems! Fill hole(s) with face(s).
shell = topods_Shell(sewing_shape)
# Make solid from shell and return result
make_solid = BRepBuilderAPI_MakeSolid()
make_solid.Add(shell)
solid = make_solid.Solid()
builder.MakeSolid(solid)
builder.Add(solid, shell)
return solid
def topo2topotype(occtopology):
"""
This function converts the original OCCtopology of the given topology. e.g. an OCCcompound that is originally an OCCface etc.
Parameters
----------
occtopology : OCCtopology
The OCCtopology to be converted.
OCCtopology includes: OCCshape, OCCcompound, OCCcompsolid, OCCsolid, OCCshell, OCCface, OCCwire, OCCedge, OCCvertex
Returns
-------
original topology : OCCtopology
The original OCCtopology of the input.
"""
shapetype = occtopology.ShapeType()
if shapetype == TopAbs_COMPOUND:#compound
orig_topo = topods_Compound(occtopology)
if shapetype == TopAbs_COMPSOLID:#compsolid
orig_topo = topods_CompSolid(occtopology)
if shapetype == TopAbs_SOLID:#solid
orig_topo = topods_Solid(occtopology)
if shapetype == TopAbs_SHELL:#shell
orig_topo = topods_Shell(occtopology)
if shapetype == TopAbs_FACE:#face
orig_topo = topods_Face(occtopology)
if shapetype == TopAbs_WIRE:#wire
orig_topo = topods_Wire(occtopology)
if shapetype == TopAbs_EDGE:#edge
orig_topo = topods_Edge(occtopology)
if shapetype == TopAbs_VERTEX:#vertex
orig_topo = topods_Vertex(occtopology)
return orig_topo
def recognize_clicked(shp, *kwargs):
""" This is the function called every time
a face is clicked in the 3d view
"""
for shape in shp: # this should be a TopoDS_Face TODO check it is
print("Face selected: ", shape)
recognize_face(topods_Face(shape))
def occ_triangle_mesh(event=None):
#
# Mesh the shape
#
BRepMesh_IncrementalMesh(aShape, 0.1)
builder = BRep_Builder()
Comp = TopoDS_Compound()
builder.MakeCompound(Comp)
ex = TopExp_Explorer(aShape, TopAbs_FACE)
while ex.More():
F = topods_Face(ex.Current())
L = TopLoc_Location()
facing = (BRep_Tool().Triangulation(F, L)).GetObject()
tab = facing.Nodes()
tri = facing.Triangles()
for i in range(1, facing.NbTriangles() + 1):
trian = tri.Value(i)
#print trian
index1, index2, index3 = trian.Get()
for j in range(1, 4):
if j == 1:
M = index1
N = index2
elif j == 2:
N = index3
elif j == 3:
M = index2
ME = BRepBuilderAPI_MakeEdge(tab.Value(M), tab.Value(N))
if ME.IsDone():
builder.Add(Comp, ME.Edge())
ex.Next()
display.DisplayShape(Comp, update=True)
def occ_topo_list(shape):
""" return the edges & faces from `shape`
:param shape: a TopoDS_Shape
:return: a list of edges and faces
"""
from OCC.TopAbs import TopAbs_FACE
from OCC.TopAbs import TopAbs_EDGE
from OCC.TopExp import TopExp_Explorer
from OCC.TopoDS import topods_Face, topods_Edge
topExp = TopExp_Explorer()
topExp.Init(shape, TopAbs_FACE)
faces = []
edges = []
while topExp.More():
face = topods_Face(topExp.Current())
faces.append(face)
topExp.Next()
topExp.Init(shape, TopAbs_EDGE)
while topExp.More():
edge = topods_Edge(topExp.Current())
edges.append(edge)
topExp.Next()
return faces, edges
def chamfer(self, length, length2, edgeList):
"""
Chamfers the specified edges of this solid.
:param length: length > 0, the length (length) of the chamfer
:param length2: length2 > 0, optional parameter for asymmetrical chamfer. Should be `None` if not required.
:param edgeList: a list of Edge objects, which must belong to this solid
:return: Chamfered solid
"""
nativeEdges = [e.wrapped for e in edgeList]
# make a edge --> faces mapping
edge_face_map = TopTools_IndexedDataMapOfShapeListOfShape()
topexp_MapShapesAndAncestors(self.wrapped, ta.TopAbs_EDGE,
ta.TopAbs_FACE, edge_face_map)
# note: we prefer 'length' word to 'radius' as opposed to FreeCAD's API
chamfer_builder = BRepFilletAPI_MakeChamfer(self.wrapped)
if length2:
d1 = length
d2 = length2
else:
d1 = length
d2 = length
for e in nativeEdges:
face = edge_face_map.FindFromKey(e).First()
chamfer_builder.Add(d1, d2, e, topods_Face(
face)) # NB: edge_face_map return a generic TopoDS_Shape
return self.__class__(chamfer_builder.Shape())
def occ_topo_list(shape):
""" return the edges & faces from `shape`
:param shape: a TopoDS_Shape
:return: a list of edges and faces
"""
from OCC.TopAbs import TopAbs_FACE
from OCC.TopAbs import TopAbs_EDGE
from OCC.TopExp import TopExp_Explorer
from OCC.TopoDS import topods_Face, topods_Edge
topExp = TopExp_Explorer()
topExp.Init(shape, TopAbs_FACE)
faces = []
edges = []
while topExp.More():
face = topods_Face(topExp.Current())
faces.append(face)
topExp.Next()
topExp.Init(shape, TopAbs_EDGE)
while topExp.More():
edge = topods_Edge(topExp.Current())
edges.append(edge)
topExp.Next()
return faces, edges
def topo_explorer(occtopo2explore, topotype2find):
"""
This function explores and fetches the specified topological type from the given OCCtopology.
e.g. find a list of OCCfaces in an OCCcompound.
Parameters
----------
occtopo2explore : OCCtopology
The OCCtopology to be explored.
OCCtopology includes: OCCshape, OCCcompound, OCCcompsolid, OCCsolid, OCCshell, OCCface, OCCwire, OCCedge, OCCvertex
topotype2find : str
The string describing the topology to find.
The strings can be e.g. "compound", "compsolid", "solid", "shell", "face", "wire", "edge", "vertex".
Returns
-------
list of topology : list of OCCtopology
The list of OCCtopology found in the specified OCCtopology.
"""
geom_list = []
if topotype2find == "compound":
shapetype2find_topABS = TopAbs_COMPOUND
if topotype2find == "compsolid":
shapetype2find_topABS = TopAbs_COMPSOLID
if topotype2find == "solid":
shapetype2find_topABS = TopAbs_SOLID
if topotype2find == "shell":
shapetype2find_topABS = TopAbs_SHELL
if topotype2find == "face":
shapetype2find_topABS = TopAbs_FACE
if topotype2find == "wire":
shapetype2find_topABS = TopAbs_WIRE
if topotype2find == "edge":
shapetype2find_topABS = TopAbs_EDGE
if topotype2find == "vertex":
shapetype2find_topABS = TopAbs_VERTEX
ex = TopExp_Explorer(occtopo2explore, shapetype2find_topABS)
while ex.More():
if shapetype2find_topABS == 0:
geom = topods_Compound(ex.Current())
if shapetype2find_topABS == 1:
geom = topods_CompSolid(ex.Current())
if shapetype2find_topABS == 2:
geom = topods_Solid(ex.Current())
if shapetype2find_topABS == 3:
geom = topods_Shell(ex.Current())
if shapetype2find_topABS == 4:
geom = topods_Face(ex.Current())
if shapetype2find_topABS == 5:
geom = topods_Wire(ex.Current())
if shapetype2find_topABS == 6:
geom = topods_Edge(ex.Current())
if shapetype2find_topABS == 7:
geom = topods_Vertex(ex.Current())
geom_list.append(geom)
ex.Next()
return geom_list
def get_faces(_shape):
""" return the faces from `_shape`
:param _shape: TopoDS_Shape, or a subclass like TopoDS_Solid
:return: a list of faces found in `_shape`
"""
topExp = TopExp_Explorer()
topExp.Init(_shape, TopAbs_FACE)
_faces = []
while topExp.More():
fc = topods_Face(topExp.Current())
_faces.append(fc)
topExp.Next()
return _faces
def draft_angle(event=None):
S = BRepPrimAPI_MakeBox(200., 300., 150.).Shape()
adraft = BRepOffsetAPI_DraftAngle(S)
topExp = TopExp_Explorer()
topExp.Init(S, TopAbs_FACE)
while topExp.More():
face = topods_Face(topExp.Current())
surf = Handle_Geom_Plane_DownCast(BRep_Tool_Surface(face)).GetObject()
dirf = surf.Pln().Axis().Direction()
ddd = gp_Dir(0, 0, 1)
if dirf.IsNormal(ddd, precision_Angular()):
adraft.Add(face, ddd, math.radians(15), gp_Pln(gp_Ax3(gp_XOY())))
topExp.Next()
adraft.Build()
display.DisplayShape(adraft.Shape(), update=True)
def draft_angle(event=None):
S = BRepPrimAPI_MakeBox(200., 300., 150.).Shape()
adraft = BRepOffsetAPI_DraftAngle(S)
topExp = TopExp_Explorer()
topExp.Init(S, TopAbs_FACE)
while topExp.More():
face = topods_Face(topExp.Current())
surf = Handle_Geom_Plane_DownCast(BRep_Tool_Surface(face)).GetObject()
dirf = surf.Pln().Axis().Direction()
ddd = gp_Dir(0, 0, 1)
if dirf.IsNormal(ddd, precision_Angular()):
adraft.Add(face, ddd, math.radians(15), gp_Pln(gp_Ax3(gp_XOY())))
topExp.Next()
adraft.Build()
display.DisplayShape(adraft.Shape(), update=True)
def get_faces(_shape):
""" return the faces from `_shape`
:param _shape: TopoDS_Shape, or a subclass like TopoDS_Solid
:return: a list of faces found in `_shape`
"""
topExp = TopExp_Explorer()
topExp.Init(_shape, TopAbs_FACE)
_faces = []
while topExp.More():
fc = topods_Face(topExp.Current())
_faces.append(fc)
topExp.Next()
return _faces
def shape2shapetype(occ_shape):
shapetype = occ_shape.ShapeType()
if shapetype == TopAbs_COMPOUND: #compound
orig_topo = topods_Compound(occ_shape)
if shapetype == TopAbs_COMPSOLID: #compsolid
orig_topo = topods_CompSolid(occ_shape)
if shapetype == TopAbs_SOLID: #solid
orig_topo = topods_Solid(occ_shape)
if shapetype == TopAbs_SHELL: #shell
orig_topo = topods_Shell(occ_shape)
if shapetype == TopAbs_FACE: #face
orig_topo = topods_Face(occ_shape)
if shapetype == TopAbs_WIRE: #wire
orig_topo = topods_Wire(occ_shape)
if shapetype == TopAbs_EDGE: #edge
orig_topo = topods_Edge(occ_shape)
if shapetype == TopAbs_VERTEX: #vertex
orig_topo = topods_Vertex(occ_shape)
return orig_topo
def simple_mesh():
#
# Create the shape
#
shape = BRepPrimAPI_MakeBox(200, 200, 200).Shape()
theBox = BRepPrimAPI_MakeBox(200, 60, 60).Shape()
theSphere = BRepPrimAPI_MakeSphere(gp_Pnt(100, 20, 20), 80).Shape()
shape = BRepAlgoAPI_Fuse(theSphere, theBox).Shape()
#
# Mesh the shape
#
BRepMesh_IncrementalMesh(shape, 0.8)
builder = BRep_Builder()
comp = TopoDS_Compound()
builder.MakeCompound(comp)
bt = BRep_Tool()
ex = TopExp_Explorer(shape, TopAbs_FACE)
while ex.More():
face = topods_Face(ex.Current())
location = TopLoc_Location()
facing = (bt.Triangulation(face, location)).GetObject()
tab = facing.Nodes()
tri = facing.Triangles()
for i in range(1, facing.NbTriangles()+1):
trian = tri.Value(i)
index1, index2, index3 = trian.Get()
for j in range(1, 4):
if j == 1:
m = index1
n = index2
elif j == 2:
n = index3
elif j == 3:
m = index2
me = BRepBuilderAPI_MakeEdge(tab.Value(m), tab.Value(n))
if me.IsDone():
builder.Add(comp, me.Edge())
ex.Next()
display.EraseAll()
display.DisplayShape(shape)
display.DisplayShape(comp, update=True)
def geom_explorer(geom2explore, shapetype2find):
geom_list = []
if shapetype2find == "compound":
shapetype2find_topABS = TopAbs_COMPOUND
if shapetype2find == "compsolid":
shapetype2find_topABS = TopAbs_COMPSOLID
if shapetype2find == "solid":
shapetype2find_topABS = TopAbs_SOLID
if shapetype2find == "shell":
shapetype2find_topABS = TopAbs_SHELL
if shapetype2find == "face":
shapetype2find_topABS = TopAbs_FACE
if shapetype2find == "wire":
shapetype2find_topABS = TopAbs_WIRE
if shapetype2find == "edge":
shapetype2find_topABS = TopAbs_EDGE
if shapetype2find == "vertex":
shapetype2find_topABS = TopAbs_VERTEX
ex = TopExp_Explorer(geom2explore, shapetype2find_topABS)
while ex.More():
if shapetype2find_topABS == 0:
geom = topods_Compound(ex.Current())
if shapetype2find_topABS == 1:
geom = topods_CompSolid(ex.Current())
if shapetype2find_topABS == 2:
geom = topods_Solid(ex.Current())
if shapetype2find_topABS == 3:
geom = topods_Shell(ex.Current())
if shapetype2find_topABS == 4:
geom = topods_Face(ex.Current())
if shapetype2find_topABS == 5:
geom = topods_Wire(ex.Current())
if shapetype2find_topABS == 6:
geom = topods_Edge(ex.Current())
if shapetype2find_topABS == 7:
geom = topods_Vertex(ex.Current())
geom_list.append(geom)
ex.Next()
return geom_list
def __init__(self, shape):
from OCC.BRep import BRep_Tool
from OCC.BRepMesh import BRepMesh_IncrementalMesh
from OCC.TopAbs import TopAbs_FACE, TopAbs_VERTEX
from OCC.TopExp import TopExp_Explorer
from OCC.TopLoc import TopLoc_Location
from OCC.TopoDS import topods_Face, topods_Vertex, TopoDS_Iterator
vertices = [] # a (nested) list of vec3
triangles = [] # a (flat) list of integers
normals = []
uv = []
# Mesh the shape
linDeflection = 0.8
BRepMesh_IncrementalMesh(shape, linDeflection)
bt = BRep_Tool()
# Explore the faces of the shape
# each face is triangulated, we need to collect all the parts
expFac = TopExp_Explorer(shape, TopAbs_FACE)
while expFac.More():
face = topods_Face(expFac.Current())
location = TopLoc_Location()
facing = (bt.Triangulation(face, location)).GetObject()
try:
tri = facing.Triangles()
nTri = facing.NbTriangles()
ver = facing.Nodes()
except:
tri = None
nTri = None
ver = None
# store origin of the face's local coordinates
transf = face.Location().Transformation()
# iterate over triangles and store indices of vertices defining each triangle
# OCC uses one-based indexing
for i in range(1, nTri + 1):
# each triangle is defined by three points
# each point is defined by its index in the list of vertices
index1, index2, index3 = tri.Value(i).Get()
indices = [index1, index2, index3]
# python uses zero-based indexing
# for each vertex of a triangle, check whether it is already known
# then store it (or not) and update the index
for idx in [0, 1, 2]:
# read global coordinates of each point
vec3 = [
ver.Value(indices[idx]).Transformed(transf).X(),
ver.Value(indices[idx]).Transformed(transf).Y(),
ver.Value(indices[idx]).Transformed(transf).Z()
]
if vec3 not in vertices:
vertices.append(vec3)
indices[idx] = vertices.index(vec3)
triangles.extend(indices)
expFac.Next()
self.shape = shape
self.vertices = vertices
self.triangles = triangles
self.normals = normals
self.uv = uv
def read(cls, filename):
controller = IGESControl_Controller()
controller.Init()
reader = IGESControl_Reader()
reader.ReadFile(filename)
reader.TransferRoots()
shape = reader.OneShape()
n_faces = 0
control_point_position = [0]
faces_explorer = TopExp_Explorer(shape, TopAbs_FACE)
mesh_points = np.zeros(shape=(0, 3))
while faces_explorer.More():
# performing some conversions to get the right format (BSplineSurface)
face = topods_Face(faces_explorer.Current())
nurbs_converter = BRepBuilderAPI_NurbsConvert(face)
nurbs_converter.Perform(face)
nurbs_face = nurbs_converter.Shape()
brep_face = BRep_Tool.Surface(topods_Face(nurbs_face))
bspline_face = geomconvert_SurfaceToBSplineSurface(brep_face)
# openCascade object
occ_face = bspline_face.GetObject()
# extract the Control Points of each face
n_poles_u = occ_face.NbUPoles()
n_poles_v = occ_face.NbVPoles()
control_polygon_coordinates = np.zeros(shape=(n_poles_u *
n_poles_v, 3))
# cycle over the poles to get their coordinates
i = 0
for pole_u_direction in range(n_poles_u):
for pole_v_direction in range(n_poles_v):
print(pole_u_direction, pole_v_direction)
control_point_coordinates = occ_face.Pole(
pole_u_direction + 1, pole_v_direction + 1)
control_polygon_coordinates[i, :] = [
control_point_coordinates.X(),
control_point_coordinates.Y(),
control_point_coordinates.Z()
]
i += 1
# pushing the control points coordinates to the mesh_points array
# (used for FFD)
mesh_points = np.append(mesh_points,
control_polygon_coordinates,
axis=0)
control_point_position.append(control_point_position[-1] +
n_poles_u * n_poles_v)
n_faces += 1
faces_explorer.Next()
return {
'shape': shape,
'points': mesh_points,
'control_point_position': control_point_position
}
def write(cls, filename, data, tolerance=1e-6):
# cycle on the faces to update the control points position
# init some quantities
shape = data.shape
control_point_position = data.control_point_position
mesh_points = data.points
faces_explorer = TopExp_Explorer(shape, TopAbs_FACE)
n_faces = 0
compound_builder = BRep_Builder()
compound = TopoDS_Compound()
compound_builder.MakeCompound(compound)
while faces_explorer.More():
# similar to the parser method
face = topods_Face(faces_explorer.Current())
nurbs_converter = BRepBuilderAPI_NurbsConvert(face)
nurbs_converter.Perform(face)
nurbs_face = nurbs_converter.Shape()
face_aux = topods_Face(nurbs_face)
brep_face = BRep_Tool.Surface(topods_Face(nurbs_face))
bspline_face = geomconvert_SurfaceToBSplineSurface(brep_face)
occ_face = bspline_face.GetObject()
n_poles_u = occ_face.NbUPoles()
n_poles_v = occ_face.NbVPoles()
i = 0
for pole_u_direction in range(n_poles_u):
for pole_v_direction in range(n_poles_v):
control_point_coordinates = mesh_points[
+control_point_position[n_faces], :]
point_xyz = gp_XYZ(*control_point_coordinates)
gp_point = gp_Pnt(point_xyz)
occ_face.SetPole(pole_u_direction + 1,
pole_v_direction + 1, gp_point)
i += 1
# construct the deformed wire for the trimmed surfaces
wire_maker = BRepBuilderAPI_MakeWire()
tol = ShapeFix_ShapeTolerance()
brep = BRepBuilderAPI_MakeFace(occ_face.GetHandle(),
tolerance).Face()
brep_face = BRep_Tool.Surface(brep)
# cycle on the edges
edge_explorer = TopExp_Explorer(nurbs_face, TopAbs_EDGE)
while edge_explorer.More():
edge = topods_Edge(edge_explorer.Current())
# edge in the (u,v) coordinates
edge_uv_coordinates = BRep_Tool.CurveOnSurface(edge, face_aux)
# evaluating the new edge: same (u,v) coordinates, but
# different (x,y,x) ones
edge_phis_coordinates_aux = BRepBuilderAPI_MakeEdge(
edge_uv_coordinates[0], brep_face)
edge_phis_coordinates = edge_phis_coordinates_aux.Edge()
tol.SetTolerance(edge_phis_coordinates, tolerance)
wire_maker.Add(edge_phis_coordinates)
edge_explorer.Next()
# grouping the edges in a wire
wire = wire_maker.Wire()
# trimming the surfaces
brep_surf = BRepBuilderAPI_MakeFace(occ_face.GetHandle(),
wire).Shape()
compound_builder.Add(compound, brep_surf)
n_faces += 1
faces_explorer.Next()
IGESControl_Controller_Init()
writer = IGESControl_Writer()
writer.AddShape(compound)
writer.Write(filename)
def parse(self, filename):
"""
Method to parse the file `filename`. It returns a matrix with all
the coordinates.
:param string filename: name of the input file.
:return: mesh_points: it is a `n_points`-by-3 matrix containing
the coordinates of the points of the mesh
:rtype: numpy.ndarray
"""
self.infile = filename
self.shape = self.load_shape_from_file(filename)
# cycle on the faces to get the control points
# init some quantities
n_faces = 0
control_point_position = [0]
faces_explorer = TopExp_Explorer(self.shape, TopAbs_FACE)
mesh_points = np.zeros(shape=(0, 3))
while faces_explorer.More():
# performing some conversions to get the right format (BSplineSurface)
face = topods_Face(faces_explorer.Current())
nurbs_converter = BRepBuilderAPI_NurbsConvert(face)
nurbs_converter.Perform(face)
nurbs_face = nurbs_converter.Shape()
brep_face = BRep_Tool.Surface(topods_Face(nurbs_face))
bspline_face = geomconvert_SurfaceToBSplineSurface(brep_face)
# openCascade object
occ_face = bspline_face.GetObject()
# extract the Control Points of each face
n_poles_u = occ_face.NbUPoles()
n_poles_v = occ_face.NbVPoles()
control_polygon_coordinates = np.zeros(
shape=(n_poles_u * n_poles_v, 3))
# cycle over the poles to get their coordinates
i = 0
for pole_u_direction in range(n_poles_u):
for pole_v_direction in range(n_poles_v):
control_point_coordinates = occ_face.Pole(
pole_u_direction + 1, pole_v_direction + 1)
control_polygon_coordinates[i, :] = [
control_point_coordinates.X(),
control_point_coordinates.Y(),
control_point_coordinates.Z()
]
i += 1
# pushing the control points coordinates to the mesh_points array
# (used for FFD)
mesh_points = np.append(
mesh_points, control_polygon_coordinates, axis=0)
control_point_position.append(
control_point_position[-1] + n_poles_u * n_poles_v)
n_faces += 1
faces_explorer.Next()
self._control_point_position = control_point_position
return mesh_points
def write(self, mesh_points, filename, tolerance=None):
"""
Writes a output file, called `filename`, copying all the structures
from self.filename but the coordinates. `mesh_points` is a matrix
that contains the new coordinates to write in the output file.
:param numpy.ndarray mesh_points: it is a *n_points*-by-3 matrix
containing the coordinates of the points of the mesh.
:param str filename: name of the output file.
:param float tolerance: tolerance for the construction of the faces
and wires in the write function. If not given it uses
`self.tolerance`.
"""
self._check_filename_type(filename)
self._check_extension(filename)
self._check_infile_instantiation()
self.outfile = filename
if tolerance is not None:
self.tolerance = tolerance
# cycle on the faces to update the control points position
# init some quantities
faces_explorer = TopExp_Explorer(self.shape, TopAbs_FACE)
n_faces = 0
control_point_position = self._control_point_position
compound_builder = BRep_Builder()
compound = TopoDS_Compound()
compound_builder.MakeCompound(compound)
while faces_explorer.More():
# similar to the parser method
face = topods_Face(faces_explorer.Current())
nurbs_converter = BRepBuilderAPI_NurbsConvert(face)
nurbs_converter.Perform(face)
nurbs_face = nurbs_converter.Shape()
face_aux = topods_Face(nurbs_face)
brep_face = BRep_Tool.Surface(topods_Face(nurbs_face))
bspline_face = geomconvert_SurfaceToBSplineSurface(brep_face)
occ_face = bspline_face.GetObject()
n_poles_u = occ_face.NbUPoles()
n_poles_v = occ_face.NbVPoles()
i = 0
for pole_u_direction in range(n_poles_u):
for pole_v_direction in range(n_poles_v):
control_point_coordinates = mesh_points[
i + control_point_position[n_faces], :]
point_xyz = gp_XYZ(*control_point_coordinates)
gp_point = gp_Pnt(point_xyz)
occ_face.SetPole(pole_u_direction + 1, pole_v_direction + 1,
gp_point)
i += 1
# construct the deformed wire for the trimmed surfaces
wire_maker = BRepBuilderAPI_MakeWire()
tol = ShapeFix_ShapeTolerance()
brep = BRepBuilderAPI_MakeFace(occ_face.GetHandle(),
self.tolerance).Face()
brep_face = BRep_Tool.Surface(brep)
# cycle on the edges
edge_explorer = TopExp_Explorer(nurbs_face, TopAbs_EDGE)
while edge_explorer.More():
edge = topods_Edge(edge_explorer.Current())
# edge in the (u,v) coordinates
edge_uv_coordinates = BRep_Tool.CurveOnSurface(edge, face_aux)
# evaluating the new edge: same (u,v) coordinates, but
# different (x,y,x) ones
edge_phis_coordinates_aux = BRepBuilderAPI_MakeEdge(
edge_uv_coordinates[0], brep_face)
edge_phis_coordinates = edge_phis_coordinates_aux.Edge()
tol.SetTolerance(edge_phis_coordinates, self.tolerance)
wire_maker.Add(edge_phis_coordinates)
edge_explorer.Next()
# grouping the edges in a wire
wire = wire_maker.Wire()
# trimming the surfaces
brep_surf = BRepBuilderAPI_MakeFace(occ_face.GetHandle(),
wire).Shape()
compound_builder.Add(compound, brep_surf)
n_faces += 1
faces_explorer.Next()
self.write_shape_to_file(compound, self.outfile)
def write(self, mesh_points, filename, tolerance=None):
"""
Writes a output file, called filename, copying all the structures
from self.filename but the coordinates. `mesh_points` is a matrix
that contains the new coordinates to write in the output file.
:param numpy.ndarray mesh_points: it is a `n_points`-by-3 matrix
containing the coordinates of the points of the mesh
:param string filename: name of the output file.
:param float tolerance: tolerance for the construction of the faces
and wires in the write function. If not given it uses
`self.tolerance`.
"""
self._check_filename_type(filename)
self._check_extension(filename)
self._check_infile_instantiation()
self.outfile = filename
if tolerance is not None:
self.tolerance = tolerance
# cycle on the faces to update the control points position
# init some quantities
faces_explorer = TopExp_Explorer(self.shape, TopAbs_FACE)
n_faces = 0
control_point_position = self._control_point_position
compound_builder = BRep_Builder()
compound = TopoDS_Compound()
compound_builder.MakeCompound(compound)
while faces_explorer.More():
# similar to the parser method
face = topods_Face(faces_explorer.Current())
nurbs_converter = BRepBuilderAPI_NurbsConvert(face)
nurbs_converter.Perform(face)
nurbs_face = nurbs_converter.Shape()
face_aux = topods_Face(nurbs_face)
brep_face = BRep_Tool.Surface(topods_Face(nurbs_face))
bspline_face = geomconvert_SurfaceToBSplineSurface(brep_face)
occ_face = bspline_face.GetObject()
n_poles_u = occ_face.NbUPoles()
n_poles_v = occ_face.NbVPoles()
i = 0
for pole_u_direction in range(n_poles_u):
for pole_v_direction in range(n_poles_v):
control_point_coordinates = mesh_points[
i + control_point_position[n_faces], :]
point_xyz = gp_XYZ(*control_point_coordinates)
gp_point = gp_Pnt(point_xyz)
occ_face.SetPole(pole_u_direction + 1,
pole_v_direction + 1, gp_point)
i += 1
# construct the deformed wire for the trimmed surfaces
wire_maker = BRepBuilderAPI_MakeWire()
tol = ShapeFix_ShapeTolerance()
brep = BRepBuilderAPI_MakeFace(occ_face.GetHandle(),
self.tolerance).Face()
brep_face = BRep_Tool.Surface(brep)
# cycle on the edges
edge_explorer = TopExp_Explorer(nurbs_face, TopAbs_EDGE)
while edge_explorer.More():
edge = topods_Edge(edge_explorer.Current())
# edge in the (u,v) coordinates
edge_uv_coordinates = BRep_Tool.CurveOnSurface(edge, face_aux)
# evaluating the new edge: same (u,v) coordinates, but different (x,y,x) ones
edge_phis_coordinates_aux = BRepBuilderAPI_MakeEdge(
edge_uv_coordinates[0], brep_face)
edge_phis_coordinates = edge_phis_coordinates_aux.Edge()
tol.SetTolerance(edge_phis_coordinates, self.tolerance)
wire_maker.Add(edge_phis_coordinates)
edge_explorer.Next()
# grouping the edges in a wire
wire = wire_maker.Wire()
# trimming the surfaces
brep_surf = BRepBuilderAPI_MakeFace(occ_face.GetHandle(),
wire).Shape()
compound_builder.Add(compound, brep_surf)
n_faces += 1
faces_explorer.Next()
self.write_shape_to_file(compound, self.outfile)
def parse(self, filename):
"""
Method to parse the file `filename`. It returns a matrix with all
the coordinates.
:param string filename: name of the input file.
:return: mesh_points: it is a `n_points`-by-3 matrix containing
the coordinates of the points of the mesh
:rtype: numpy.ndarray
"""
self.infile = filename
self.shape = self.load_shape_from_file(filename)
# cycle on the faces to get the control points
# init some quantities
n_faces = 0
control_point_position = [0]
faces_explorer = TopExp_Explorer(self.shape, TopAbs_FACE)
mesh_points = np.zeros(shape=(0, 3))
while faces_explorer.More():
# performing some conversions to get the right format (BSplineSurface)
face = topods_Face(faces_explorer.Current())
nurbs_converter = BRepBuilderAPI_NurbsConvert(face)
nurbs_converter.Perform(face)
nurbs_face = nurbs_converter.Shape()
brep_face = BRep_Tool.Surface(topods_Face(nurbs_face))
bspline_face = geomconvert_SurfaceToBSplineSurface(brep_face)
# openCascade object
occ_face = bspline_face.GetObject()
# extract the Control Points of each face
n_poles_u = occ_face.NbUPoles()
n_poles_v = occ_face.NbVPoles()
control_polygon_coordinates = np.zeros(shape=(n_poles_u *
n_poles_v, 3))
# cycle over the poles to get their coordinates
i = 0
for pole_u_direction in range(n_poles_u):
for pole_v_direction in range(n_poles_v):
control_point_coordinates = occ_face.Pole(
pole_u_direction + 1, pole_v_direction + 1)
control_polygon_coordinates[i, :] = [
control_point_coordinates.X(),
control_point_coordinates.Y(),
control_point_coordinates.Z()
]
i += 1
# pushing the control points coordinates to the mesh_points array (used for FFD)
mesh_points = np.append(mesh_points,
control_polygon_coordinates,
axis=0)
control_point_position.append(control_point_position[-1] +
n_poles_u * n_poles_v)
n_faces += 1
faces_explorer.Next()
self._control_point_position = control_point_position
return mesh_points
