| 1 |
|
| 2 |
######################################################## |
| 3 |
# |
| 4 |
# Copyright (c) 2003-2008 by University of Queensland |
| 5 |
# Earth Systems Science Computational Center (ESSCC) |
| 6 |
# http://www.uq.edu.au/esscc |
| 7 |
# |
| 8 |
# Primary Business: Queensland, Australia |
| 9 |
# Licensed under the Open Software License version 3.0 |
| 10 |
# http://www.opensource.org/licenses/osl-3.0.php |
| 11 |
# |
| 12 |
######################################################## |
| 13 |
|
| 14 |
__copyright__="""Copyright (c) 2003-2008 by University of Queensland |
| 15 |
Earth Systems Science Computational Center (ESSCC) |
| 16 |
http://www.uq.edu.au/esscc |
| 17 |
Primary Business: Queensland, Australia""" |
| 18 |
__license__="""Licensed under the Open Software License version 3.0 |
| 19 |
http://www.opensource.org/licenses/osl-3.0.php""" |
| 20 |
__url__="http://www.uq.edu.au/esscc/escript-finley" |
| 21 |
|
| 22 |
""" |
| 23 |
mesh generation using gmsh |
| 24 |
|
| 25 |
@var __author__: name of author |
| 26 |
@var __copyright__: copyrights |
| 27 |
@var __license__: licence agreement |
| 28 |
@var __url__: url entry point on documentation |
| 29 |
@var __version__: version |
| 30 |
@var __date__: date of the version |
| 31 |
""" |
| 32 |
|
| 33 |
__author__="Lutz Gross, l.gross@uq.edu.au" |
| 34 |
|
| 35 |
import design |
| 36 |
import tempfile |
| 37 |
import os |
| 38 |
from primitives import Point, Spline, BezierCurve, BSpline, Line, Arc, CurveLoop, RuledSurface, PlaneSurface, SurfaceLoop, Volume, PropertySet, Ellipse |
| 39 |
|
| 40 |
class Design(design.Design): |
| 41 |
""" |
| 42 |
Design for gmsh. |
| 43 |
""" |
| 44 |
DELAUNAY="iso" |
| 45 |
NETGEN="netgen" |
| 46 |
TETGEN="tetgen" |
| 47 |
|
| 48 |
def __init__(self,dim=3,element_size=1.,order=1,keep_files=False): |
| 49 |
""" |
| 50 |
Initializes the gmsh design. |
| 51 |
|
| 52 |
@param dim: spatial dimension |
| 53 |
@param element_size: global element size |
| 54 |
@param order: element order |
| 55 |
@param keep_files: flag to keep work files |
| 56 |
""" |
| 57 |
design.Design.__init__(self,dim=dim,element_size=element_size,order=order,keep_files=keep_files) |
| 58 |
self.setScriptFileName() |
| 59 |
self.setMeshFileName() |
| 60 |
self.setOptions() |
| 61 |
|
| 62 |
def setScriptFileName(self,name=None): |
| 63 |
""" |
| 64 |
Sets the filename for the gmsh input script. If no name is given a name |
| 65 |
with extension I{geo} is generated. |
| 66 |
""" |
| 67 |
if name == None: |
| 68 |
tmp_f_id=tempfile.mkstemp(suffix=".geo") |
| 69 |
self.__scriptname=tmp_f_id[1] |
| 70 |
os.close(tmp_f_id[0]) |
| 71 |
else: |
| 72 |
self.__scriptname=name |
| 73 |
self.setKeepFilesOn() |
| 74 |
|
| 75 |
def getScriptFileName(self): |
| 76 |
""" |
| 77 |
Returns the name of the gmsh script file. |
| 78 |
""" |
| 79 |
return self.__scriptname |
| 80 |
|
| 81 |
def setMeshFileName(self, name=None): |
| 82 |
""" |
| 83 |
Sets the name for the gmsh mesh file. If no name is given a name with |
| 84 |
extension I{msh} is generated. |
| 85 |
""" |
| 86 |
if name == None: |
| 87 |
tmp_f_id=tempfile.mkstemp(suffix=".msh") |
| 88 |
self.__mshname=tmp_f_id[1] |
| 89 |
os.close(tmp_f_id[0]) |
| 90 |
else: |
| 91 |
self.__mshname=name |
| 92 |
self.setKeepFilesOn() |
| 93 |
|
| 94 |
def getMeshFileName(self): |
| 95 |
""" |
| 96 |
Returns the name of the gmsh mesh file. |
| 97 |
""" |
| 98 |
return self.__mshname |
| 99 |
|
| 100 |
def setOptions(self,algorithm=None,optimize_quality=True,smoothing=1, curvature_based_element_size=False): |
| 101 |
""" |
| 102 |
Sets options for the mesh generator. |
| 103 |
""" |
| 104 |
if curvature_based_element_size: |
| 105 |
print "information: gmsh does not support curvature based element size anymore. Option ignored." |
| 106 |
if algorithm==None: algorithm=self.DELAUNAY |
| 107 |
self.__algo=algorithm |
| 108 |
self.__optimize_quality=optimize_quality |
| 109 |
self.__smoothing=smoothing |
| 110 |
|
| 111 |
def __del__(self): |
| 112 |
""" |
| 113 |
Cleans up. |
| 114 |
""" |
| 115 |
if not self.keepFiles() : |
| 116 |
os.unlink(self.getScriptFileName()) |
| 117 |
os.unlink(self.getMeshFileName()) |
| 118 |
|
| 119 |
def getCommandString(self): |
| 120 |
""" |
| 121 |
Returns the gmsh command line. |
| 122 |
""" |
| 123 |
if self.__optimize_quality: |
| 124 |
opt="-optimize " |
| 125 |
else: |
| 126 |
opt="" |
| 127 |
|
| 128 |
exe="gmsh -format msh -%s -algo %s -smooth %s %s-v 0 -order %s -o %s %s" % ( |
| 129 |
self.getDim(), self.__algo, self.__smoothing, opt, |
| 130 |
self.getElementOrder(), self.getMeshFileName(), |
| 131 |
self.getScriptFileName()) |
| 132 |
return exe |
| 133 |
|
| 134 |
def getMeshHandler(self): |
| 135 |
""" |
| 136 |
Returns a handle to a mesh meshing the design. In the current |
| 137 |
implementation a mesh file name in gmsh format is returned. |
| 138 |
""" |
| 139 |
f = open(self.getScriptFileName(),"w") |
| 140 |
f.write(self.getScriptString()) |
| 141 |
f.close() |
| 142 |
cmd = self.getCommandString() |
| 143 |
ret = os.system(cmd) / 256 |
| 144 |
if ret > 0: |
| 145 |
raise RuntimeError, "Could not build mesh: %s"%cmd |
| 146 |
else: |
| 147 |
return self.getMeshFileName() |
| 148 |
|
| 149 |
def getScriptString(self): |
| 150 |
""" |
| 151 |
Returns the gmsh script to generate the mesh. |
| 152 |
""" |
| 153 |
h=self.getElementSize() |
| 154 |
out="// generated by esys.pycad\n" |
| 155 |
for prim in self.getAllPrimitives(): |
| 156 |
p=prim.getUnderlyingPrimitive() |
| 157 |
if isinstance(p, Point): |
| 158 |
c=p.getCoordinates() |
| 159 |
out+="Point(%s) = {%s , %s, %s , %s };\n"%(p.getID(),c[0],c[1],c[2], p.getLocalScale()*h) |
| 160 |
|
| 161 |
elif isinstance(p, Spline): |
| 162 |
out+="Spline(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getControlPoints())) |
| 163 |
|
| 164 |
elif isinstance(p, BezierCurve): |
| 165 |
out+="Bezier(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getControlPoints())) |
| 166 |
|
| 167 |
elif isinstance(p, BSpline): |
| 168 |
out+="BSpline(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getControlPoints())) |
| 169 |
|
| 170 |
elif isinstance(p, Line): |
| 171 |
out+="Line(%s) = {%s, %s};\n"%(p.getID(),p.getStartPoint().getDirectedID(),p.getEndPoint().getDirectedID()) |
| 172 |
|
| 173 |
elif isinstance(p, Arc): |
| 174 |
out+="Circle(%s) = {%s, %s, %s};\n"%(p.getID(),p.getStartPoint().getDirectedID(),p.getCenterPoint().getDirectedID(),p.getEndPoint().getDirectedID()) |
| 175 |
|
| 176 |
elif isinstance(p, Ellipse): |
| 177 |
out+="Ellipse(%s) = {%s, %s, %s, %s};\n"%(p.getID(),p.getStartPoint().getDirectedID(),p.getCenterPoint().getDirectedID(),p.getPointOnMainAxis().getDirectedID(), p.getEndPoint().getDirectedID()) |
| 178 |
|
| 179 |
elif isinstance(p, CurveLoop): |
| 180 |
out+="Line Loop(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getCurves())) |
| 181 |
|
| 182 |
elif isinstance(p, RuledSurface): |
| 183 |
out+="Ruled Surface(%s) = {%s};\n"%(p.getID(),p.getBoundaryLoop().getDirectedID()) |
| 184 |
|
| 185 |
elif isinstance(p, PlaneSurface): |
| 186 |
line=self.__mkArgs(p.getHoles()) |
| 187 |
if len(line)>0: |
| 188 |
out+="Plane Surface(%s) = {%s, %s};\n"%(p.getID(),p.getBoundaryLoop().getDirectedID(), line) |
| 189 |
else: |
| 190 |
out+="Plane Surface(%s) = {%s};\n"%(p.getID(),p.getBoundaryLoop().getDirectedID()) |
| 191 |
|
| 192 |
elif isinstance(p, SurfaceLoop): |
| 193 |
out+="Surface Loop(%s) = {%s};\n"%(p.getID(),self.__mkArgs(p.getSurfaces())) |
| 194 |
|
| 195 |
elif isinstance(p, Volume): |
| 196 |
line=self.__mkArgs(p.getHoles()) |
| 197 |
if len(line)>0: |
| 198 |
out+="Volume(%s) = {%s, %s};\n"%(p.getID(),p.getSurfaceLoop().getDirectedID(), line) |
| 199 |
else: |
| 200 |
out+="Volume(%s) = {%s};\n"%(p.getID(),p.getSurfaceLoop().getDirectedID()) |
| 201 |
|
| 202 |
elif isinstance(p, PropertySet): |
| 203 |
if p.getNumItems()>0: |
| 204 |
dim=p.getDim() |
| 205 |
line="Physical " |
| 206 |
if dim==0: |
| 207 |
line+="Point" |
| 208 |
elif dim==1: |
| 209 |
line+="Line" |
| 210 |
elif dim==2: |
| 211 |
line+="Surface" |
| 212 |
else: |
| 213 |
line+="Volume" |
| 214 |
out+=line+"(" + str(p.getID()) + ") = {"+self.__mkArgs(p.getItems())+"};\n" |
| 215 |
|
| 216 |
else: |
| 217 |
raise TypeError("unable to pass %s object to gmsh."%str(type(p))) |
| 218 |
return out |
| 219 |
|
| 220 |
|
| 221 |
def __mkArgs(self,args): |
| 222 |
line="" |
| 223 |
for i in args: |
| 224 |
if len(line)>0: |
| 225 |
line+=", %s"%i.getDirectedID() |
| 226 |
else: |
| 227 |
line="%s"%i.getDirectedID() |
| 228 |
return line |
| 229 |
|
Parent Directory
| 
Revision Log