generates spectral geom file for (currently) gyroid or diamond minimal surfaces. Inside and outside of a given threshold value are distinguished by microstructure 1 and 2.

processing/pre/spectral_minimalSurface

@@ -0,0 +1,75 @@
+#!/usr/bin/env python
+# -*- coding: UTF-8 no BOM -*-
+
+import os,sys,string,math
+from optparse import OptionParser, OptionGroup, Option, SUPPRESS_HELP
+
+
+# -----------------------------
+class extendedOption(Option):
+# -----------------------------
+# used for definition of new option parser action 'extend', which enables to take multiple option arguments
+# taken from online tutorial http://docs.python.org/library/optparse.html
+    
+    ACTIONS = Option.ACTIONS + ("extend",)
+    STORE_ACTIONS = Option.STORE_ACTIONS + ("extend",)
+    TYPED_ACTIONS = Option.TYPED_ACTIONS + ("extend",)
+    ALWAYS_TYPED_ACTIONS = Option.ALWAYS_TYPED_ACTIONS + ("extend",)
+
+    def take_action(self, action, dest, opt, value, values, parser):
+        if action == "extend":
+            lvalue = value.split(",")
+            values.ensure_value(dest, []).extend(lvalue)
+        else:
+            Option.take_action(self, action, dest, opt, value, values, parser)
+
+
+# ----------------------- MAIN -------------------------------
+
+
+minimal_surfaces = ['gyroid','d']
+
+surface = {
+            'gyroid': lambda x,y,z: math.sin(x)*math.cos(y)+math.sin(y)*math.cos(z)+math.cos(x)*math.sin(z),
+            'd':      lambda x,y,z: math.cos(z)*math.sin(x+y)+math.sin(z)*math.cos(x-y),
+          }
+  
+
+parser = OptionParser(option_class=extendedOption, usage='%prog', description = """
+Produce VTK point file from geom data
+""" + string.replace('$Id: spectral_geomCheck 994 2011-09-05 13:38:10Z MPIE\p.eisenlohr $','\n','\\n')
+)
+
+parser.add_option('-t', '--type', dest='type', type='string', \
+                  help='type of minimal surface [%s]'%(','.join(minimal_surfaces)))
+parser.add_option('-c', '--threshold', dest='threshold', type='float', \
+                  help='threshold value defining minimal surface')
+parser.add_option('-p', '--periods', dest='periods', type='int', \
+                  help='number of repetitions of unit cell')
+parser.add_option('-r', '--resolution', dest='resolution', type='int', nargs=3, \
+                  help='resolution in x, y, and z')
+parser.add_option('-d', '--dimension', dest='dimension', type='float', nargs=3, \
+                  help='physical dimension in x, y, and z')
+
+parser.set_defaults(type = 'gyroid')
+parser.set_defaults(threshold = 0.5)
+parser.set_defaults(periods = 1)
+parser.set_defaults(resolution = [8,8,8])
+parser.set_defaults(dimension = [1.0,1.0,1.0])
+
+(options, args) = parser.parse_args()
+
+print "3 header"
+print "resolution\ta %i\tb %i\tc %i"%(options.resolution[0],options.resolution[1],options.resolution[2],)
+print "dimension\tx %g\ty %g\tz %g"%(options.dimension[0],options.dimension[1],options.dimension[2],)
+print "homogenization  1"
+
+for z in range(options.resolution[2]):
+  for y in range(options.resolution[1]):
+    for x in range(options.resolution[0]):
+      print {True:'1',False:'2'}\
+            [options.threshold > 
+             surface[options.type](options.periods*2.0*math.pi*x/options.resolution[0],
+                                   options.periods*2.0*math.pi*y/options.resolution[1],
+                                   options.periods*2.0*math.pi*z/options.resolution[2],
+                                  )]