def _loft(arr, smooth=False, shell=False, maxdegree=4): builder = BRepOffsetAPI_ThruSections(not shell, not smooth) builder.SetMaxDegree(maxdegree) for v in arr: if v.Shape().ShapeType() == TopAbs_FACE: raise Exception("Loft argument must be array of Wires or Edges") for r in arr: builder.AddWire(r.Wire_orEdgeToWire()) return Shape(builder.Shape())
def _generate_tip(self, maxDeg): """ Private method to generate the surface that closing the blade tip. :param int maxDeg: Define the maximal U degree of generated surface """ self._import_occ_libs() generator = BRepOffsetAPI_ThruSections(False, False, 1e-10) generator.SetMaxDegree(maxDeg) # npoints_up == npoints_down npoints = len(self.blade_coordinates_down[-1][0]) vertices_1 = TColgp_HArray1OfPnt(1, npoints) vertices_2 = TColgp_HArray1OfPnt(1, npoints) for j in range(npoints): vertices_1.SetValue( j + 1, gp_Pnt(1000 * self.blade_coordinates_down[-1][0][j], 1000 * self.blade_coordinates_down[-1][1][j], 1000 * self.blade_coordinates_down[-1][2][j])) vertices_2.SetValue( j + 1, gp_Pnt(1000 * self.blade_coordinates_up[-1][0][j], 1000 * self.blade_coordinates_up[-1][1][j], 1000 * self.blade_coordinates_up[-1][2][j])) # Initializes an algorithm for constructing a constrained # BSpline curve passing through the points of the blade last # section, with tolerance = 1e-9 bspline_1 = GeomAPI_Interpolate(vertices_1, False, 1e-9) bspline_1.Perform() bspline_2 = GeomAPI_Interpolate(vertices_2, False, 1e-9) bspline_2.Perform() edge_1 = BRepBuilderAPI_MakeEdge(bspline_1.Curve()).Edge() edge_2 = BRepBuilderAPI_MakeEdge(bspline_2.Curve()).Edge() # Add BSpline wire to the generator constructor generator.AddWire(BRepBuilderAPI_MakeWire(edge_1).Wire()) generator.AddWire(BRepBuilderAPI_MakeWire(edge_2).Wire()) # Returns the shape built by the shape construction algorithm generator.Build() # Returns the Face generated by each edge of the first section self.generated_tip = generator.GeneratedFace(edge_1)
def _generate_lower_face(self, maxDeg): """ Private method to generate the blade lower face. :param int maxDeg: Define the maximal U degree of generated surface """ self._import_occ_libs() # Initializes ThruSections algorithm for building a shell passing # through a set of sections (wires). The generated faces between # the edges of every two consecutive wires are smoothed out with # a precision criterion = 1e-10 generator = BRepOffsetAPI_ThruSections(False, False, 1e-10) generator.SetMaxDegree(maxDeg) # Define upper edges (wires) for the face generation for i in range(self.n_sections): npoints = len(self.blade_coordinates_down[i][0]) vertices = TColgp_HArray1OfPnt(1, npoints) for j in range(npoints): vertices.SetValue( j + 1, gp_Pnt(1000 * self.blade_coordinates_down[i][0][j], 1000 * self.blade_coordinates_down[i][1][j], 1000 * self.blade_coordinates_down[i][2][j])) # Initializes an algorithm for constructing a constrained # BSpline curve passing through the points of the blade i-th # section, with tolerance = 1e-9 bspline = GeomAPI_Interpolate(vertices, False, 1e-9) bspline.Perform() edge = BRepBuilderAPI_MakeEdge(bspline.Curve()).Edge() if i == 0: bound_root_edge = edge # Add BSpline wire to the generator constructor generator.AddWire(BRepBuilderAPI_MakeWire(edge).Wire()) # Returns the shape built by the shape construction algorithm generator.Build() # Returns the Face generated by each edge of the first section self.generated_lower_face = generator.GeneratedFace(bound_root_edge)
class LoftShape(object): """ Loft a shape using a sequence of sections. :param sections: The sections of the loft. These are usually wires but the first and last section can be vertices. Edges are converted to wires before adding to the loft tool. :type sections: collections.Sequence(afem.topology.entities.Vertex or afem.topology.entities.Edge or afem.topology.entities.Wire) :param bool is_solid: If *True* the tool will build a solid, otherwise it will build a shell. :param bool make_ruled: If *True* the faces between sections will be ruled surfaces, otherwise they are smoothed out by approximation. :param float pres3d: Defines the precision for the approximation algorithm. :param bool check_compatibility: Option to check the orientation of the sections to avoid twisted results and update to have the same number of edges. :param bool use_smoothing: Option to use approximation algorithm. :param OCC.Core.Approx.Approx_ParametrizationType par_type: Parametrization type. :param OCC.Core.GeomAbs.GeomAbs_Shape continuity: The desired continuity. :param int max_degree: The maximum degree for the approximation algorithm. :raise TypeError: If any of the sections cannot be added to the tool because they are of the wrong type. """ def __init__(self, sections, is_solid=False, make_ruled=False, pres3d=1.0e-6, check_compatibility=None, use_smoothing=None, par_type=None, continuity=None, max_degree=None): self._tool = BRepOffsetAPI_ThruSections(is_solid, make_ruled, pres3d) if check_compatibility is not None: self._tool.CheckCompatibility(check_compatibility) if use_smoothing is not None: self._tool.SetSmoothing(use_smoothing) if par_type is not None: self._tool.SetParType(par_type) if continuity is not None: self._tool.SetContinuity(continuity) if max_degree is not None: self._tool.SetMaxDegree(max_degree) for section in sections: if section.is_vertex: self._tool.AddVertex(section.object) elif section.is_edge: wire = Wire.by_edge(section) self._tool.AddWire(wire.object) elif section.is_wire: self._tool.AddWire(section.object) else: raise TypeError('Invalid shape type in loft.') self._tool.Build() @property def is_done(self): """ :return: *True* if done, *False* if not. :rtype: bool """ return self._tool.IsDone() @property def shape(self): """ :return: The lofted shape. :rtype: afem.topology.entities.Shape """ return Shape.wrap(self._tool.Shape()) @property def first_shape(self): """ :return: The first/bottom shape of the loft if a solid was constructed. :rtype: afem.topology.entities.Shape """ return Shape.wrap(self._tool.FirstShape()) @property def last_shape(self): """ :return: The last/top shape of the loft if a solid was constructed. :rtype: afem.topology.entities.Shape """ return Shape.wrap(self._tool.LastShape()) @property def max_degree(self): """ :return: The max degree used in the approximation algorithm :rtype: int """ return self._tool.MaxDegree() def generated_face(self, edge): """ Get a face(s) generated by the edge. If the ruled option was used, then this returns each face generated by the edge. If the smoothing option was used, then this returns the face generated by the edge. :param afem.topology.entities.Edge edge: The edge. :return: The face(s) generated by the edge. :rtype: afem.topology.entities.Shape """ return Shape.wrap(self._tool.GeneratedFace(edge.object))