--- /dev/null
+import smesh
+import SMESH
+import math
+
+def GetNewNodes(mesh,Elems,OldNodes):
+ """
+ Auxilary function, which return list of nodes from
+ given Elems avoided nodes from OldNodes
+ """
+ newnodes = []
+ for i in Elems:
+ nbn = mesh.GetElemNbNodes(i)
+ for j in range(0,nbn):
+ nn = mesh.GetElemNode(i,j)
+ isold = 0
+ for k in range(0,len(newnodes)):
+ if nn==newnodes[k]:
+ isold = 1
+ break
+ pass
+ if isold: continue
+ for k in range(0,len(OldNodes)):
+ if nn==OldNodes[k]:
+ isold = 1
+ break
+ pass
+ if isold: continue
+ newnodes.append(nn)
+ pass
+ pass
+ return newnodes
+
+
+# create empty mesh
+mesh = smesh.smesh.CreateEmptyMesh()
+
+ed = mesh.GetMeshEditor()
+tol = 0.001
+
+# create a cross from quadrangle faces
+# 1. create first edge and make extrusion along 0x
+n1 = ed.AddNode(55,-5,0)
+n2 = ed.AddNode(55,5,0)
+e1 = ed.AddEdge([n1,n2])
+dir1 = SMESH.DirStruct(SMESH.PointStruct(-10,0,0))
+ed.ExtrusionSweep([e1],dir1,11)
+# 2. create second edge and make extrusion along 0y
+n3 = ed.AddNode(-5,-55,0)
+n4 = ed.AddNode(5,-55,0)
+e2 = ed.AddEdge([n3,n4])
+dir2 = SMESH.DirStruct(SMESH.PointStruct(0,10,0))
+ed.ExtrusionSweep([e2],dir2,11)
+
+# since result has coincident nodes and faces
+# we have to make merge
+nodes = ed.FindCoincidentNodes(0.001)
+ed.MergeNodes(nodes)
+ed.MergeEqualElements()
+
+# make extrusion faces along 0z
+faces = mesh.GetElementsByType(SMESH.FACE)
+nbf = len(faces)
+maxang = 2.0
+zstep = 5
+nbzsteps = 50
+dir3 = SMESH.DirStruct(SMESH.PointStruct(0,0,zstep))
+newfaces = [] # list for keeping created top faces
+ # during extrusion
+
+for i in range(0,nbzsteps):
+ ed.ExtrusionSweep(faces,dir3,1)
+ # find top faces after each extrusion and keep them
+ res = ed.GetLastCreatedElems()
+ nbr = len(res)
+ nfaces = []
+ for j in res:
+ nbn = mesh.GetElemNbNodes(j)
+ if nbn!=4: continue
+ nn1 = mesh.GetElemNode(j,0)
+ xyz1 = mesh.GetNodeXYZ(nn1)
+ nn2 = mesh.GetElemNode(j,1)
+ xyz2 = mesh.GetNodeXYZ(nn2)
+ nn3 = mesh.GetElemNode(j,2)
+ xyz3 = mesh.GetNodeXYZ(nn3)
+ if abs(xyz1[2]-xyz2[2])<tol and abs(xyz1[2]-xyz3[2])<tol :
+ # this face is a top face
+ nfaces.append(j)
+ pass
+ pass
+ if len(nfaces)!=nbf:
+ print "len(nfaces)!=nbf"
+ break
+ newfaces.append(nfaces)
+ # update faces for before next step of extrusion
+ faces = nfaces
+ pass
+
+# rotate faces from newfaces
+axisr1 = SMESH.AxisStruct(0,0,0,0,0,1)
+for i in range(0,nbzsteps):
+ ang = maxang*(1-math.cos((i+1)*math.pi/nbzsteps))
+ ed.Rotate(newfaces[i],axisr1,ang,0)
+
+
+# create circles
+# create two edges and rotate them for creation
+# full circle
+n5 = ed.AddNode(65,0,0)
+n6 = ed.AddNode(67.5,0,0)
+n7 = ed.AddNode(70,0,0)
+e56 = ed.AddEdge([n5,n6])
+e67 = ed.AddEdge([n6,n7])
+axisr2 = SMESH.AxisStruct(65,0,0,0,1,0)
+ed.RotationSweep([e56,e67],axisr2, math.pi/6, 12, tol)
+res = ed.GetLastCreatedElems()
+faces1 = []
+for i in res:
+ nbn = mesh.GetElemNbNodes(i)
+ if nbn>2: faces1.append(i)
+ pass
+nbf1 = len(faces1)
+
+# create other two edges and rotate them for creation
+# other full circle
+n8 = ed.AddNode(-65,0,0)
+n9 = ed.AddNode(-67.5,0,0)
+n10 = ed.AddNode(-70,0,0)
+e8 = ed.AddEdge([n8,n9])
+e9 = ed.AddEdge([n9,n10])
+axisr3 = SMESH.AxisStruct(-65,0,0,0,-1,0)
+ed.RotationSweep([e8,e9],axisr3, math.pi/6, 12, tol)
+res = ed.GetLastCreatedElems()
+faces2 = []
+for i in res:
+ nbn = mesh.GetElemNbNodes(i)
+ if nbn>2: faces2.append(i)
+ pass
+nbf2 = len(faces2)
+
+# there are coincident nodes after rotation
+# therefore we have to merge nodes
+nodes = ed.FindCoincidentNodes(0.001)
+ed.MergeNodes(nodes)
+
+nbcircs = 2
+nbrsteps = 24
+nbrs = nbcircs*nbrsteps
+dz = nbzsteps*zstep/nbrs
+
+# create first spiral
+oldnodes = []
+newnodes = GetNewNodes(mesh,faces1,oldnodes)
+oldnodes = newnodes
+
+nodes = []
+ed.RotationSweep(faces1,axisr1, math.pi*2/nbrsteps, nbrs, tol)
+res = ed.GetLastCreatedElems()
+
+for i in range(0,nbrs):
+ volumes = []
+ for j in range(0,nbf1): volumes.append(res[i+j*nbrs])
+ newnodes = GetNewNodes(mesh,volumes,oldnodes)
+ for j in newnodes:
+ xyz = mesh.GetNodeXYZ(j)
+ ed.MoveNode(j,xyz[0],xyz[1],xyz[2]+dz*(i+1))
+ pass
+ oldnodes = newnodes
+ pass
+
+# create second spiral
+oldnodes = []
+newnodes = GetNewNodes(mesh,faces2,oldnodes)
+oldnodes = newnodes
+
+nodes = []
+ed.RotationSweep(faces2,axisr1, math.pi*2/nbrsteps, nbrs, tol)
+res = ed.GetLastCreatedElems()
+
+for i in range(0,nbrs):
+ volumes = []
+ for j in range(0,nbf2): volumes.append(res[i+j*nbrs])
+ newnodes = GetNewNodes(mesh,volumes,oldnodes)
+ for j in newnodes:
+ xyz = mesh.GetNodeXYZ(j)
+ ed.MoveNode(j,xyz[0],xyz[1],xyz[2]+dz*(i+1))
+ pass
+ oldnodes = newnodes
+ pass
+
+
