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# -*- coding: utf-8 -*- |
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######################################################## |
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# |
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# Copyright (c) 2003-2012 by University of Queensland |
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# Earth Systems Science Computational Center (ESSCC) |
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# http://www.uq.edu.au/esscc |
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# |
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# Primary Business: Queensland, Australia |
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# Licensed under the Open Software License version 3.0 |
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# http://www.opensource.org/licenses/osl-3.0.php |
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# |
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######################################################## |
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|
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__copyright__="""Copyright (c) 2003-2012 by University of Queensland |
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Earth Systems Science Computational Center (ESSCC) |
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http://www.uq.edu.au/esscc |
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Primary Business: Queensland, Australia""" |
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__license__="""Licensed under the Open Software License version 3.0 |
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http://www.opensource.org/licenses/osl-3.0.php""" |
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__url__="https://launchpad.net/escript-finley" |
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|
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""" |
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mesh generation using gmsh |
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|
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:var __author__: name of author |
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:var __copyright__: copyrights |
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:var __license__: licence agreement |
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:var __url__: url entry point on documentation |
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:var __version__: version |
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:var __date__: date of the version |
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""" |
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|
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__author__="Lutz Gross, l.gross@uq.edu.au" |
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|
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from . import design |
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import tempfile |
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import os |
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from .primitives import Point, Spline, BezierCurve, BSpline, Line, Arc, CurveLoop, RuledSurface, PlaneSurface, SurfaceLoop, Volume, PropertySet, Ellipse |
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from esys.escript import getMPIWorldMax, getMPIRankWorld |
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from .transformations import DEG |
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|
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class Design(design.Design): |
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""" |
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Design for gmsh. |
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|
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""" |
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DELAUNAY="Delauny" |
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MESHADAPT="MeshAdapt" |
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FRONTAL="Frontal" |
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NETGEN="Frontal" |
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TETGEN="Delauny" |
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|
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|
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def __init__(self,dim=3,element_size=1.,order=1,keep_files=False): |
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""" |
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Initializes the gmsh design. |
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|
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:param dim: spatial dimension |
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:param element_size: global element size |
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:param order: element order |
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:param keep_files: flag to keep work files |
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""" |
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design.Design.__init__(self,dim=dim,element_size=element_size,order=order,keep_files=keep_files) |
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self.__scriptname="" |
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self.setScriptFileName() |
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self.setOptions() |
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self.setFileFormat(self.GMSH) |
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|
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def setScriptFileName(self,name=None): |
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""" |
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Sets the filename for the gmsh input script. If no name is given a name |
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with extension I{geo} is generated. |
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""" |
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if self.__scriptname: |
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os.unlink(self.__scriptname) |
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if name == None: |
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self.__scriptname_set=False |
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tmp_f_id=tempfile.mkstemp(suffix=".geo") |
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self.__scriptname=tmp_f_id[1] |
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os.close(tmp_f_id[0]) |
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else: |
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self.__scriptname=name |
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self.__scriptname_set=True |
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|
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def getScriptFileName(self): |
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""" |
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Returns the name of the gmsh script file. |
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""" |
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return self.__scriptname |
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|
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def setOptions(self,algorithm=None, optimize_quality=True, smoothing=1, curvature_based_element_size=False, algorithm2D=None, algorithm3D=None, generate_hexahedra=False): |
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""" |
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Sets options for the mesh generator. |
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|
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:param algorithm2D: selects 2D meshing algorithm |
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:type algorithm2D: in self.DELAUNAY, self.MESHADAPT, self.FRONTAL |
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:param algorithm3D: selects 3D meshing algorithm |
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:type algorithm3D: in self.DELAUNAY, self.FRONTAL |
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:param curvature_based_element_size: switch for curvature based element size adaption |
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:type curvature_based_element_size: ```bool``` |
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:param smoothing: number of smoothing steps |
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:type smoothing: non-negative ```int``` |
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:param optimize_quality: switch for mesh quality optimization |
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:type optimize_quality: ```bool``` |
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:param generate_hexahedra: switch for using quadrangles/hexahedra elements everywhere. |
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:type generate_hexahedra: ```bool``` |
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""" |
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if algorithm3D==None: algorithm3D=self.FRONTAL |
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if algorithm==None: |
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if algorithm2D==None: algorithm2D=self.MESHADAPT |
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else: |
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if not algorithm2D==None: |
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if not algorithm == algorithm2D : |
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raise ValueError("argument algorithm (=%s) and algorithm2D (=%s) must have the same value if set."%(algorithm, algorithm2D)) |
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algorithm2D = algorithm |
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if not algorithm2D in [ self.DELAUNAY, self.MESHADAPT, self.FRONTAL ]: |
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raise ValueError("illegal 2D meshing algorithm %s."%algorithm2D) |
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if not algorithm3D in [ self.DELAUNAY, self.FRONTAL ]: |
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raise ValueError("illegal 3D meshing algorithm %s."%algorithm3D) |
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|
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self.__curvature_based_element_size=curvature_based_element_size |
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self.__algo2D=algorithm2D |
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self.__algo3D=algorithm3D |
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self.__optimize_quality=optimize_quality |
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self.__smoothing=smoothing |
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self.__generate_hexahedra=generate_hexahedra |
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def getOptions(self,name=None): |
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""" |
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Returns the current options for the mesh generator. |
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""" |
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if name == None: |
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return {"optimize_quality" : self.__optimize_quality , |
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"smoothing" : self.__smoothing, |
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"curvature_based_element_size" : self.__curvature_based_element_size, |
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"generate_hexahedra" : self.__generate_hexahedra, |
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"algorithm2D" : self.__algo2D, |
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"algorithm3D" : self.__algo3D } |
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else: |
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return self.getOption()[name] |
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|
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def __del__(self): |
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""" |
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Cleans up. |
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""" |
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if not self.keepFiles(): |
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if not self.__scriptname_set: |
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os.unlink(self.getScriptFileName()) |
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if not self.__mshname_set: |
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os.unlink(self.getMeshFileName()) |
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|
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def getCommandString(self): |
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""" |
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Returns the gmsh command line. |
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""" |
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exe="gmsh -format %s -%s -order %s -v 3 -o '%s' '%%s'" % ( |
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self.getFileFormat(), self.getDim(), self.getElementOrder(), self.getMeshFileName()) |
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|
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return exe |
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|
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def getScriptHandler(self): |
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""" |
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Returns a handler to the script file to generate the geometry. |
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In the current implementation a script file name is returned. |
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""" |
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if getMPIRankWorld() == 0: |
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open(self.getScriptFileName(),"w").write(self.getScriptString()) |
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return self.getScriptFileName() |
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|
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def getMeshHandler(self): |
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""" |
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Returns a handle to a mesh meshing the design. In the current |
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implementation a mesh file name in gmsh format is returned. |
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""" |
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from .gmshrunner import runGmsh |
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import shlex |
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args=shlex.split(self.getCommandString()) |
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args[-1]=args[-1]%self.getScriptHandler() |
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ret=runGmsh(args) |
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if ret > 0: |
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raise RuntimeError("Could not build mesh using: %s"%" ".join(args)) |
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return self.getMeshFileName() |
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|
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|
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def getScriptString(self): |
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""" |
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Returns the gmsh script to generate the mesh. |
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""" |
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h=self.getElementSize() |
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out='// generated by esys.pycad\nGeneral.Terminal = 1;\nGeneral.ExpertMode = 1;\n' |
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options=self.getOptions() |
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if options["optimize_quality"]: |
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out+="Mesh.Optimize = 1;\n" |
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else: |
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out+="Mesh.Optimize = 0;\n" |
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if options["curvature_based_element_size"]: |
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out+="Mesh.CharacteristicLengthFromCurvature = 1;\n" |
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else: |
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out+="Mesh.CharacteristicLengthFromCurvature = 0;\n" |
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if options["generate_hexahedra"]: |
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if self.getDim() == 2: |
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out+="Mesh.SubdivisionAlgorithm = 1;\n" |
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else: |
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out+="Mesh.SubdivisionAlgorithm = 2;\n" |
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else: |
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out+="Mesh.SubdivisionAlgorithm = 0;\n" |
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out+="Mesh.Smoothing = %d;\n"%options["smoothing"] |
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if options["algorithm2D"] == self.MESHADAPT: out+="Mesh.Algorithm = 1; // = MeshAdapt\n" |
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if options["algorithm2D"] == self.DELAUNAY : out+="Mesh.Algorithm = 5; // = Delaunay\n" |
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if options["algorithm2D"] == self.FRONTAL: out+="Mesh.Algorithm = 6; // = Frontal\n" |
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if options["algorithm3D"] == self.DELAUNAY : out+="Mesh.Algorithm3D = 1; // = Delaunay\n" |
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if options["algorithm3D"] == self.FRONTAL: out+="Mesh.Algorithm3D = 4; // = Frontal\n" |
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for prim in self.getAllPrimitives(): |
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p=prim.getUnderlyingPrimitive() |
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if isinstance(p, Point): |
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c=p.getCoordinates() |
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out+="Point(%s) = {%f , %f, %f , %f };\n"%(p.getID(),c[0],c[1],c[2], p.getLocalScale()*h) |
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|
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elif isinstance(p, Spline): |
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out+="Spline(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getControlPoints()))+self.__mkTransfiniteLine(p) |
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|
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elif isinstance(p, BezierCurve): |
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out+="Bezier(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getControlPoints()))+self.__mkTransfiniteLine(p) |
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|
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elif isinstance(p, BSpline): |
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out+="BSpline(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getControlPoints()))+self.__mkTransfiniteLine(p) |
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|
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elif isinstance(p, Line): |
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out+="Line(%s) = {%s, %s};\n"%(p.getID(),p.getStartPoint().getDirectedID(),p.getEndPoint().getDirectedID())+self.__mkTransfiniteLine(p) |
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|
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elif isinstance(p, Arc): |
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out+="Circle(%s) = {%s, %s, %s};\n"%(p.getID(),p.getStartPoint().getDirectedID(),p.getCenterPoint().getDirectedID(),p.getEndPoint().getDirectedID())+self.__mkTransfiniteLine(p) |
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|
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elif isinstance(p, Ellipse): |
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out+="Ellipse(%s) = {%s, %s, %s, %s};\n"%(p.getID(),p.getStartPoint().getDirectedID(),p.getCenterPoint().getDirectedID(),p.getPointOnMainAxis().getDirectedID(), p.getEndPoint().getDirectedID())+self.__mkTransfiniteLine(p) |
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|
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elif isinstance(p, CurveLoop): |
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out+="Line Loop(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getCurves())) |
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|
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elif isinstance(p, RuledSurface): |
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out+="Ruled Surface(%s) = {%s};\n"%(p.getID(),p.getBoundaryLoop().getDirectedID())+self.__mkTransfiniteSurface(p) |
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|
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elif isinstance(p, PlaneSurface): |
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line=self.__mkArgs(p.getHoles()) |
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if len(line)>0: |
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out+="Plane Surface(%s) = {%s, %s};\n"%(p.getID(),p.getBoundaryLoop().getDirectedID(), line)+self.__mkTransfiniteSurface(p) |
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else: |
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out+="Plane Surface(%s) = {%s};\n"%(p.getID(),p.getBoundaryLoop().getDirectedID())+self.__mkTransfiniteSurface(p) |
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|
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elif isinstance(p, SurfaceLoop): |
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out+="Surface Loop(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getSurfaces())) |
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|
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elif isinstance(p, Volume): |
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line=self.__mkArgs(p.getHoles()) |
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if len(line)>0: |
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out+="Volume(%s) = {%s, %s};\n"%(p.getID(),p.getSurfaceLoop().getDirectedID(), line)+self.__mkTransfiniteVolume(p) |
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else: |
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out+="Volume(%s) = {%s};\n"%(p.getID(),p.getSurfaceLoop().getDirectedID())+self.__mkTransfiniteVolume(p) |
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|
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elif isinstance(p, PropertySet): |
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if p.getNumItems()>0: |
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dim=p.getDim() |
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line="Physical " |
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if dim==0: |
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line+="Point" |
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elif dim==1: |
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line+="Line" |
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elif dim==2: |
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line+="Surface" |
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else: |
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line+="Volume" |
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out+=line+"(" + str(p.getID()) + ") = {"+self.__mkArgs(p.getItems(),useAbs=True)+"};\n" |
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|
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else: |
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raise TypeError("unable to pass %s object to gmsh."%str(type(p))) |
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return out |
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|
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|
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def __mkArgs(self,args, useAbs=False): |
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line="" |
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for i in args: |
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id = i.getDirectedID() |
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if useAbs: id=abs(id) |
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if len(line)>0: |
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line+=", %s"%id |
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else: |
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line="%s"%id |
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return line |
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|
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def __mkTransfiniteLine(self,p): |
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s=p.getElementDistribution() |
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if not s == None: |
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if s[2]: |
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out="Transfinite Line{%d} = %d Using Bump %s;\n"%(p.getID(),s[0],s[1]) |
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else: |
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out="Transfinite Line{%d} = %d Using Progression %s;\n"%(p.getID(),s[0],s[1]) |
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else: |
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out="" |
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return out |
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def __mkTransfiniteSurface(self,p): |
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out="" |
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o=p.getRecombination() |
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s=p.getTransfiniteMeshing() |
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if not s == None: |
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out2="" |
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if not s[0] == None: |
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for q in s[0]: |
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if len(out2)==0: |
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out2="%s"%q.getID() |
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else: |
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out2="%s,%s"%(out2,q.getID()) |
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if s[1] == None: |
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out+="Transfinite Surface{%s} = {%s};\n"%(p.getID(),out2) |
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else: |
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out+="Transfinite Surface{%s} = {%s} %s;\n"%(p.getID(),out2,s[1]) |
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if not o == None: |
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out+="Recombine Surface {%s} = %f;\n"%(p.getID(),o/DEG) |
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return out |
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def __mkTransfiniteVolume(self,p): |
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out="" |
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s=p.getTransfiniteMeshing() |
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if not s == None: |
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if len(s)>0: |
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out2="" |
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for q in s[0]: |
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if len(out2)==0: |
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out2="%s"%q.getID() |
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else: |
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out2="%s,%s"%(out2,q.getID()) |
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out+="Transfinite Volume{%s} = {%s};\n"%(p.getID(),out2) |
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else: |
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out+="Transfinite Volume{%s};\n"%(p.getID(),) |
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return out |
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