1 # Use existing faces algorithm
6 # define my 2D algorithm
7 def my2DMeshing( geomFace ):
9 # find gravity center of geomFace
10 gcXYZ = geompy.PointCoordinates( geompy.MakeCDG( geomFace ))
12 # define order and orientation of edges
14 geomEdges = geompy.SubShapeAll( geomFace, geompy.ShapeType["EDGE"])
15 sortedEdges.append(( geomEdges.pop(0), True ))
17 prevEdge_rev = sortedEdges[ -1 ]
18 prevVV = geompy.SubShapeAll( prevEdge_rev[0], geompy.ShapeType["VERTEX"])
19 prevV2 = prevVV[ prevEdge_rev[1] ]
21 for iE in range( len( geomEdges )):
22 v1,v2 = geompy.SubShapeAll( geomEdges[ iE ], geompy.ShapeType["VERTEX"])
23 same1,same2 = [( geompy.MinDistance( prevV2, v ) < 1e-7 ) for v in [v1,v2] ]
24 if not same1 and not same2: continue
25 sortedEdges.append(( geomEdges.pop( iE ), same1 ))
31 # put nodes on edges in a right order
33 for edge, isForward in sortedEdges:
34 v1,v2 = geompy.SubShapeAll( edge, geompy.ShapeType["VERTEX"])
35 edgeNodes = mesh.GetSubMeshNodesId( v2, all=False ) + \
36 mesh.GetSubMeshNodesId( edge, all=False ) + \
37 mesh.GetSubMeshNodesId( v1, all=False )
38 if not isForward: edgeNodes.reverse()
39 nodes.extend( edgeNodes[:-1] )
41 # create nodes inside the geomFace
46 nXYZ = mesh.GetNodeXYZ( n )
47 newXYZ = np.add( np.multiply( r1, gcXYZ ), np.multiply( r2, nXYZ ))
48 nodesInside.append( mesh.AddNode( newXYZ[0], newXYZ[1], newXYZ[2] ))
49 mesh.SetNodeOnFace( nodesInside[-1], geomFace, 0, 0 )
51 # find out orientation of faces to create
53 faceNorm = geompy.GetNormal( geomFace )
54 v1,v2 = [ geompy.PointCoordinates( v ) \
55 for v in geompy.SubShapeAll( faceNorm, geompy.ShapeType["VERTEX"]) ]
56 faceNormXYZ = np.subtract( v2, v1 )
57 outDirXYZ = np.subtract( v1, [ 50, 50, 50 ] )
58 if np.dot( faceNormXYZ, outDirXYZ ) < 0: # reversed face
59 faceNormXYZ = np.multiply( -1., faceNormXYZ )
61 e1 = np.subtract( mesh.GetNodeXYZ( nodes[0] ), mesh.GetNodeXYZ( nodes[1] ))
62 e2 = np.subtract( mesh.GetNodeXYZ( nodes[0] ), mesh.GetNodeXYZ( nodesInside[0] ))
63 meshNorm = np.cross( e1, e2 )
65 reverse = ( np.dot( faceNormXYZ, meshNorm ) < 0 )
70 n1, n2, n3, n4 = nodes[iN-1], nodes[iN-2], nodesInside[iN-2], nodesInside[iN-1]
73 f = mesh.AddFace( [n1, n2, n3, n4] )
75 f = mesh.AddFace( [n4, n3, n2, n1] )
76 # new faces must be assigned to geometry to allow 3D algorithm finding them
77 mesh.SetMeshElementOnShape( f, geomFace )
81 polygon = mesh.AddPolygonalFace( nodesInside )
82 mesh.SetMeshElementOnShape( polygon, geomFace )
86 # create geometry and get faces to mesh with my2DMeshing()
87 box = geompy.MakeBoxDXDYDZ( 100, 100, 100 )
88 f1 = geompy.SubShapeAll( box, geompy.ShapeType["FACE"])[0]
89 f2 = geompy.GetOppositeFace( box, f1 )
90 geompy.addToStudy( box, "box" )
91 geompy.addToStudy( f1, "f1" )
92 geompy.addToStudy( f2, "f2" )
95 mesh = smesh.Mesh( box )
96 mesh.Segment().NumberOfSegments( 5 )
101 mesh.UseExistingFaces(f1) # UseExistingFaces() allows using my2DMeshing()
102 mesh.UseExistingFaces(f2)
105 assert mesh.Compute()
109 assert mesh.Compute()