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https://git.salome-platform.org/gitpub/modules/smesh.git
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120 lines
4.4 KiB
Python
120 lines
4.4 KiB
Python
# Usage of "Use Faces to be Created Manually" algorithm
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import salome
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salome.salome_init_without_session()
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import GEOM
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from salome.geom import geomBuilder
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geompy = geomBuilder.New()
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import SMESH, SALOMEDS
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from salome.smesh import smeshBuilder
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smesh = smeshBuilder.New()
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import salome_notebook
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# define my 2D algorithm
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def my2DMeshing(geomFace, geom_builder, smesh_builder):
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import numpy as np
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# find gravity center of geomFace
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gcXYZ = geom_builder.PointCoordinates( geom_builder.MakeCDG( geomFace ))
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# define order and orientation of edges
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sortedEdges = []
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geomEdges = geom_builder.SubShapeAll( geomFace, geom_builder.ShapeType["EDGE"])
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sortedEdges.append(( geomEdges.pop(0), True ))
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while geomEdges:
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prevEdge_rev = sortedEdges[ -1 ]
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prevVV = geom_builder.SubShapeAll( prevEdge_rev[0], geom_builder.ShapeType["VERTEX"])
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prevV2 = prevVV[ prevEdge_rev[1] ]
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found = False
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for iE in range( len( geomEdges )):
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v1,v2 = geom_builder.SubShapeAll( geomEdges[ iE ], geom_builder.ShapeType["VERTEX"])
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same1,same2 = [( geom_builder.MinDistance( prevV2, v ) < 1e-7 ) for v in [v1,v2] ]
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if not same1 and not same2: continue
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sortedEdges.append(( geomEdges.pop( iE ), same1 ))
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found = True
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break
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assert found
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sortedEdges.reverse()
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# put nodes on edges in a right order
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nodes = []
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for edge, isForward in sortedEdges:
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v1,v2 = geom_builder.SubShapeAll( edge, geom_builder.ShapeType["VERTEX"])
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edgeNodes = smesh_builder.GetSubMeshNodesId( v2, all=False ) + \
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smesh_builder.GetSubMeshNodesId( edge, all=False ) + \
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smesh_builder.GetSubMeshNodesId( v1, all=False )
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if not isForward: edgeNodes.reverse()
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nodes.extend( edgeNodes[:-1] )
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# create nodes inside the geomFace
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r1 = 0.6
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r2 = 1 - r1
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nodesInside = []
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for n in nodes:
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nXYZ = smesh_builder.GetNodeXYZ( n )
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newXYZ = np.add( np.multiply( r1, gcXYZ ), np.multiply( r2, nXYZ ))
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nodesInside.append( smesh_builder.AddNode( newXYZ[0], newXYZ[1], newXYZ[2] ))
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smesh_builder.SetNodeOnFace( nodesInside[-1], geomFace, 0, 0 )
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# find out orientation of faces to create
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# geomFace normal
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faceNorm = geom_builder.GetNormal( geomFace )
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v1,v2 = [ geom_builder.PointCoordinates( v ) \
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for v in geom_builder.SubShapeAll( faceNorm, geom_builder.ShapeType["VERTEX"]) ]
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faceNormXYZ = np.subtract( v2, v1 )
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outDirXYZ = np.subtract( v1, [ 50, 50, 50 ] )
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if np.dot( faceNormXYZ, outDirXYZ ) < 0: # reversed face
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faceNormXYZ = np.multiply( -1., faceNormXYZ )
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# mesh face normal
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e1 = np.subtract( smesh_builder.GetNodeXYZ( nodes[0] ), smesh_builder.GetNodeXYZ( nodes[1] ))
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e2 = np.subtract( smesh_builder.GetNodeXYZ( nodes[0] ), smesh_builder.GetNodeXYZ( nodesInside[0] ))
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meshNorm = np.cross( e1, e2 )
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# faces orientation
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reverse = ( np.dot( faceNormXYZ, meshNorm ) < 0 )
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# create mesh faces
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iN = len( nodes )
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while iN:
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n1, n2, n3, n4 = nodes[iN-1], nodes[iN-2], nodesInside[iN-2], nodesInside[iN-1]
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iN -= 1
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if reverse:
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f = smesh_builder.AddFace( [n1, n2, n3, n4] )
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else:
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f = smesh_builder.AddFace( [n4, n3, n2, n1] )
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# new faces must be assigned to geometry to allow 3D algorithm finding them
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smesh_builder.SetMeshElementOnShape( f, geomFace )
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if reverse:
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nodesInside.reverse()
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polygon = smesh_builder.AddPolygonalFace( nodesInside )
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smesh_builder.SetMeshElementOnShape( polygon, geomFace )
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return
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# create geometry and get faces to mesh with my2DMeshing()
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box = geompy.MakeBoxDXDYDZ( 100, 100, 100 )
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f1 = geompy.SubShapeAll( box, geompy.ShapeType["FACE"])[0]
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f2 = geompy.GetOppositeFace( box, f1 )
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geompy.addToStudy( box, "box" )
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geompy.addToStudy( f1, "f1" )
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geompy.addToStudy( f2, "f2" )
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# compute 1D mesh
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mesh = smesh.Mesh( box )
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mesh.Segment().NumberOfSegments( 5 )
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mesh.Compute()
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# compute 2D mesh
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mesh.Quadrangle()
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mesh.UseExistingFaces(f1) # UseExistingFaces() allows using my2DMeshing();
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mesh.UseExistingFaces(f2) # assign UseExistingFaces() BEFORE calling my2DMeshing()!
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my2DMeshing(f1, geom_builder=geompy, smesh_builder=mesh)
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my2DMeshing(f2, geom_builder=geompy, smesh_builder=mesh)
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assert mesh.Compute()
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# compute 3D mesh
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mesh.Prism()
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assert mesh.Compute()
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