def get_booleaned_edges(shape):
edges = []
exp = TopExp.TopExp_Explorer(shape, TopAbs.TopAbs_EDGE)
while exp.More():
edges.append(topods.Edge(exp.Current()))
exp.Next()
return edges
def get_split_edges(self, edge_face_map, face, zmax, product):
exp2 = TopExp.TopExp_Explorer(face, TopAbs.TopAbs_EDGE)
while exp2.More():
edge = topods.Edge(exp2.Current())
adjface = TopoDS.TopoDS_Face()
getadj = TopOpeBRepBuild.TopOpeBRepBuild_Tools.GetAdjacentFace(
face, edge, edge_face_map, adjface)
if getadj:
try:
edge_angle = math.degrees(
self.get_angle_between_faces(face, adjface))
except:
# TODO: Figure out when a math domain error might occur,
# because it does, sometimes.
edge_angle = 0
if edge_angle > 30 and edge_angle < 160:
newedge = self.build_new_edge(edge, zmax + 0.01)
if newedge:
self.background_elements.append({
'raw': product,
'geometry': newedge,
'type': 'line',
'z': zmax + 0.01
})
exp2.Next()
def build_new_face(self, face, zpos, product):
exp = TopExp.TopExp_Explorer(face, TopAbs.TopAbs_WIRE)
while exp.More():
wireexp = BRepTools.BRepTools_WireExplorer(
topods.Wire(exp.Current()))
new_wire_builder = BRepBuilderAPI.BRepBuilderAPI_MakeWire()
first_vertex = None
previous_vertex = None
while wireexp.More():
current_vertex = wireexp.CurrentVertex()
current_point = BRep.BRep_Tool.Pnt(current_vertex)
# Dodgy technique to squash in Z axis
current_point.SetZ(zpos)
current_vertex = BRepBuilderAPI.BRepBuilderAPI_MakeVertex(
current_point).Vertex()
if not first_vertex:
first_vertex = current_vertex
if not previous_vertex:
previous_vertex = current_vertex
else:
try:
new_wire_builder.Add(
topods.Edge(
BRepBuilderAPI.BRepBuilderAPI_MakeEdge(
previous_vertex, current_vertex).Edge()))
previous_vertex = current_vertex
except:
pass
wireexp.Next()
# make last edge
if not wireexp.More():
try:
new_wire_builder.Add(
topods.Edge(
BRepBuilderAPI.BRepBuilderAPI_MakeEdge(
current_vertex, first_vertex).Edge()))
except:
pass
try:
new_wire = new_wire_builder.Wire()
new_face = BRepBuilderAPI.BRepBuilderAPI_MakeFace(
new_wire).Face()
self.background_elements.append({
'raw': product,
'geometry': new_wire,
'geometry_face': new_face,
'type': 'polygon',
'z': zpos
})
except:
#print('Could not build face')
pass
exp.Next()
def draw_line(self, element, position):
classes = self.get_classes(element["raw"], position)
exp = TopExp.TopExp_Explorer(element["geometry"], TopAbs.TopAbs_VERTEX)
points = []
while exp.More():
point = BRep.BRep_Tool.Pnt(topods.Vertex(exp.Current()))
points.append((point.X() * self.scale, -point.Y() * self.scale))
exp.Next()
self.svg.add(
self.svg.line(start=points[0],
end=points[1],
class_=" ".join(classes)))
def build_new_edge(self, edge, zpos):
exp = TopExp.TopExp_Explorer(edge, TopAbs.TopAbs_VERTEX)
new_vertices = []
while exp.More():
current_vertex = topods.Vertex(exp.Current())
current_point = BRep.BRep_Tool.Pnt(current_vertex)
current_point.SetZ(zpos)
new_vertices.append(BRepBuilderAPI.BRepBuilderAPI_MakeVertex(current_point).Vertex())
exp.Next()
try:
return BRepBuilderAPI.BRepBuilderAPI_MakeEdge(new_vertices[0], new_vertices[1]).Edge()
except:
return None
def get_background_elements(self):
total_product_shapes = len(self.product_shapes)
n = 0
intersections = []
compound = TopoDS.TopoDS_Compound()
builder = BRep.BRep_Builder()
builder.MakeCompound(compound)
for product, shape in self.product_shapes:
builder.Add(compound, shape)
print('{}/{} background elements processed ...'.format(
n, total_product_shapes),
end='\r',
flush=True)
#print('Processing product {} '.format(product.Name))
n += 1
intersection = BRepAlgoAPI.BRepAlgoAPI_Common(
self.section_box['shape'], shape).Shape()
intersection_edges = self.get_booleaned_edges(intersection)
if len(intersection_edges) <= 0:
continue
intersections.append(intersection)
transformed_intersection = BRepBuilderAPI.BRepBuilderAPI_Transform(
intersection, self.transformation)
intersection = transformed_intersection.Shape()
edge_face_map = TopTools.TopTools_IndexedDataMapOfShapeListOfShape(
)
TopExp.topexp.MapShapesAndAncestors(intersection,
TopAbs.TopAbs_EDGE,
TopAbs.TopAbs_FACE,
edge_face_map)
exp = TopExp.TopExp_Explorer(intersection, TopAbs.TopAbs_FACE)
while exp.More():
face = topods.Face(exp.Current())
normal = self.get_normal(face)
# Cull back-faces
if normal.Z() <= 0:
exp.Next()
continue
zpos, zmax = self.calculate_face_zpos(face)
self.build_new_face(face, zpos, product)
self.get_split_edges(edge_face_map, face, zmax, product)
exp.Next()
def getPolygonesFromShape(shape):
from Geometry.Geom3D import Pnt3D,Poly3D
exp = TopExp.TopExp_Explorer(shape, TopAbs.TopAbs_WIRE) # .TopAbs_FACE)
polygons = []
while exp.More():
wire = TopoDS.topods.Wire(TopoDS.topods.Wire(exp.Current()))
exp.Next()
points = []
from OCCUtils import Topology
explorer = Topology.WireExplorer(wire)
vertices = explorer.ordered_vertices()
for vertex in vertices:
pnt = BRep.BRep_Tool_Pnt(vertex)
points.append(Pnt3D(pnt.X(),pnt.Y(),pnt.Z()))
polygons.append(Poly3D(points))
return polygons
