TopoShape is the OpenCasCade topological shape wrapper. Sub-elements such as vertices, edges or faces are accessible as: * Vertex#, where # is in range(1, number of vertices) * Edge#, where # is in range(1, number of edges) * Face#, where # is in range(1, number of faces) Serialize the content of this shape to a string in BREP format. Deserialize the content of this shape from a string in BREP format. Read in an IGES, STEP or BREP file. Write the mesh in OpenInventor format to a string. Export the content of this shape to an IGES file. Export the content of this shape to an STEP file. Export the content of this shape to an BREP file. BREP is a CasCade native format. Export the content of this shape in binary format to a file. Export the content of this shape to a string in BREP format. BREP is a CasCade native format. Dump information about the shape to a string. Export the content of this shape to an STL mesh file. Load the shape from a file in BREP format. Import the content to this shape of a string in BREP format. Load the shape from a string that keeps the content in BREP format. Extrude the shape along a direction. Revolve the shape around an Axis to a given degree. Part.revolve(Vector(0,0,0),Vector(0,0,1),360) - revolves the shape around the Z Axis 360 degree. Hints: Sometimes you want to create a rotation body out of a closed edge or wire. Example: from FreeCAD import Base import Part V=Base.Vector e=Part.Ellipse() s=e.toShape() r=s.revolve(V(0,0,0),V(0,1,0), 360) Part.show(r) However, you may possibly realize some rendering artifacts or that the mesh creation seems to hang. This is because this way the surface is created twice. Since the curve is a full ellipse it is sufficient to do a rotation of 180 degree only, i.e. r=s.revolve(V(0,0,0),V(0,1,0), 180) Now when rendering this object you may still see some artifacts at the poles. Now the problem seems to be that the meshing algorithm doesn't like to rotate around a point where there is no vertex. The idea to fix this issue is that you create only half of the ellipse so that its shape representation has vertexes at its start and end point. from FreeCAD import Base import Part V=Base.Vector e=Part.Ellipse() s=e.toShape(e.LastParameter/4,3*e.LastParameter/4) r=s.revolve(V(0,0,0),V(0,1,0), 360) Part.show(r) Checks the shape and report errors in the shape structure. This is a more detailed check as done in isValid(). Union of this and a given topo shape. multiFuse((tool1,tool2,...),[tolerance=0.0]) -> Shape Union of this and a given list of topo shapes. Beginning from OCCT 6.8.1 a tolerance value can be specified Union of this and a given topo shape (old algorithm). Intersection of this and a given topo shape. Section of this with a given topo shape. Make slices of this shape. Make single slice of this shape. Difference of this and a given topo shape. generalFuse(list_of_other_shapes, fuzzy_value = 0.0): Run general fuse algorithm (GFA) between this and given shapes. list_of_other_shapes: shapes to run the algorithm against (the list is effectively prepended by 'self'). fuzzy_value: extra tolerance to apply when searching for interferences, in addition to tolerances of the input shapes. Returns a tuple of 2: (result, map). result is a compound containing all the pieces generated by the algorithm (e.g., for two spheres, the pieces are three touching solids). Pieces that touch share elements. map is a list of lists of shapes, providing the info on which children of result came from which argument. The length of list is equal to length of list_of_other_shapes + 1. First element is a list of pieces that came from shape of this, and the rest are those that come from corresponding shapes in list_of_other_shapes. hint: use isSame method to test shape equality OCC 6.9.0 or later is required. Sew the shape if there is a gap. childShapes([cumOri=True, cumLoc=True]) -> list Return a list of sub-shapes that are direct children of this shape. * If cumOri is true, the function composes all sub-shapes with the orientation of this shape. * If cumLoc is true, the function multiplies all sub-shapes by the location of this shape, i.e. it applies to each sub-shape the transformation that is associated with this shape. Removes internal wires (also holes) from the shape. Mirror this shape on a given plane. The plane is given with its base point and its normal direction. Apply geometric transformation on this or a copy the shape. This method returns a new shape. The transformation to be applied is defined as a 4x4 matrix. The underlying geometry of the following shapes may change: - a curve which supports an edge of the shape, or - a surface which supports a face of the shape; For example, a circle may be transformed into an ellipse when applying an affinity transformation. It may also happen that the circle then is represented as a b-spline curve. The transformation is applied to: - all the curves which support edges of the shape, and - all the surfaces which support faces of the shape. Note: If you want to transform a shape without changing the underlying geometry then use the methods translate or rotate. transformGeometry(Matrix) -> Shape Apply transformation on a shape without changing the underlying geometry. transformShape(Matrix,[boolean copy=False]) -> None Apply the translation to the current location of this shape. Apply the rotation (degree) to the current location of this shape Shp.rotate(Vector(0,0,0),Vector(0,0,1),180) - rotate the shape around the Z Axis 180 degrees. Apply scaling with point and factor to this shape. Make fillet. Make chamfer. makeThickness(List of shapes, Offset (Float), Tolerance (Float)) -> Shape A hollowed solid is built from an initial solid and a set of faces on this solid, which are to be removed. The remaining faces of the solid become the walls of the hollowed solid, their thickness defined at the time of construction. makeOffsetShape(offset, tolerance, inter = False, self_inter = False, offsetMode = 0, join = 0, fill = False): makes an offset shape (3d offsetting). The function supports keyword arguments. * offset: distance to expand the shape by. Negative value will shrink the shape. * tolerance: precision of approximation. * inter: (parameter to OCC routine; not implemented) * self_inter: (parameter to OCC routine; not implemented) * offsetMode: 0 = skin; 1 = pipe; 2 = recto-verso * join: method of offsetting non-tangent joints. 0 = arcs, 1 = tangent, 2 = intersection * fill: if true, offsetting a shell is to yeild a solid Returns: result of offsetting. makeOffset2D(offset, join = 0, fill = False, openResult = false, intersection = false): makes an offset shape (2d offsetting). The function supports keyword arguments. Input shape (self) can be edge, wire, face, or a compound of those. * offset: distance to expand the shape by. Negative value will shrink the shape. * join: method of offsetting non-tangent joints. 0 = arcs, 1 = tangent, 2 = intersection * fill: if true, the output is a face filling the space covered by offset. If false, the output is a wire. * openResult: affects the way open wires are processed. If False, an open wire is made. If True, a closed wire is made from a double-sided offset, with rounds around open vertices. * intersection: affects the way compounds are processed. If False, all children are offset independently. If True, and children are edges/wires, the children are offset in a collective manner. If compounding is nested, collectiveness does not spread across compounds (only direct children of a compound are taken collectively). Returns: result of offsetting (wire or face or compound of those). Compounding structure follows that of source shape. Reverses the orientation of this shape. Computes the complement of the orientation of this shape, i.e. reverses the interior/exterior status of boundaries of this shape. Destroys the reference to the underlying shape stored in this shape. As a result, this shape becomes null. Checks if the shape is closed. Checks if both shapes share the same geometry. Placement and orientation may differ. Checks if both shapes share the same geometry and placement. Orientation may differ. Checks if both shapes are equal. This means geometry, placement and orientation are equal. Checks if the shape is null. Checks if the shape is valid, i.e. neither null, nor empty nor corrupted. Tries to fix a broken shape. True is returned if the operation succeeded, False otherwise. fix(working precision, minimum precision, maximum precision) This value is computed from the value of the underlying shape reference and the location. Orientation is not taken into account. Tessellate the the shape and return a list of vertices and face indices Project a shape on this shape Parallel projection of an edge or wire on this shape makeParallelProjection(shape, dir) Perspective projection of an edge or wire on this shape makePerspectiveProjection(shape, pnt) Make a compund shape out of mesh data. Note: This should be used for rather small meshes only. Conversion of the complete geometry of a shape into NURBS geometry. For example, all curves supporting edges of the basis shape are converted into BSpline curves, and all surfaces supporting its faces are converted into BSpline surfaces. Create a copy of this shape This creates a cleaned copy of the shape with the triangulation removed. This can be useful to reduce file size when exporting as a BRep file. Warning: Use the cleaned shape with care because certain algorithms may work incorrectly if the shape has no internal triangulation any more. Replace a sub-shape with a new shape and return a new shape. The parameter is in the form list of tuples with the two shapes. Remove a sub-shape and return a new shape. The parameter is a list of shapes. Checks whether a point is inside or outside the shape. isInside(App.Vector, float, Boolean) => Boolean The App.Vector is the point you want to check if it's inside or not float gives the tolerance Boolean indicates if the point lying directly on a face is considered to be inside or not Removes redundant edges from the B-REP model proximity(Shape s): Returns two lists of Face indexes for the Faces involved in the intersection. Find the minimum distance to another shape. distToShape(Shape s): Returns a list of minimum distance and solution point pairs. Returned is a tuple of three: (dist, vectors, infos). dist is the minimum distance, in mm (float value). vectors is a list of pairs of App.Vector. Each pair corresponds to solution. Example: [(Vector (2.0, -1.0, 2.0), Vector (2.0, 0.0, 2.0)), (Vector (2.0, -1.0, 2.0), Vector (2.0, -1.0, 3.0))] First vector is a point on self, second vector is a point on s. infos contains additional info on the solutions. It is a list of tuples: (topo1, index1, params1, topo2, index2, params2) topo1, topo2 are strings identifying type of BREP element: 'Vertex', 'Edge', or 'Face'. index1, index2 are indexes of the elements (zero-based). params1, params2 are parameters of internal space of the elements. For vertices, params is None. For edges, params is one float, u. For faces, params is a tuple (u,v). Returns a SubElement getTolerance(mode, ShapeType=Shape) -> float Determines a tolerance from the ones stored in a shape mode = 0 : returns the average value between sub-shapes, mode > 0 : returns the maximal found, mode < 0 : returns the minimal found. ShapeType defines what kinds of sub-shapes to consider: Shape (default) : all : Vertex, Edge, Face, Vertex : only vertices, Edge : only edges, Face : only faces, Shell : combined Shell + Face, for each face (and containing shell), also checks edge and Vertex overTolerance(value, ShapeType=Shape) -> float Determines which shapes have a tolerance over the given value ShapeType is interpreted as in the method getTolerance inTolerance(value, ShapeType=Shape) -> float Determines which shapes have a tolerance within a given interval ShapeType is interpreted as in the method getTolerance globalTolerance(mode) -> float Returns the computed tolerance according to the mode mode = 0 : average mode > 0 : maximal mode < 0 : minimal Returns the type of the shape. Returns the orientation of the shape. List of faces in this shape. List of vertexes in this shape. List of subsequent shapes in this shape. List of subsequent shapes in this shape. List of subsequent shapes in this shape. List of Edges in this shape. List of wires in this shape. List of coumpounds in this shape. Total length of the edges of the shape. Total area of the faces of the shape. Total volume of the solids of the shape.