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2 | <!-- --> |
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3 | <!-- [History] --> |
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4 | <!-- Converted to DocBook: Katsuya Amako, Aug-2006 --> |
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5 | <!-- Changed by: Gabriele Cosmo, 18-Apr-2005 --> |
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6 | <!-- --> |
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7 | <!-- ******************************************************** --> |
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8 | |
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9 | |
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10 | <!-- ******************* Section (Level#2) ****************** --> |
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11 | <sect2 id="sect.Geom.ConvGeom"> |
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12 | <title> |
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13 | Converting Geometries from Geant3.21 |
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14 | </title> |
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15 | |
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16 | <!-- ******************* Section (Level#3) ****************** --> |
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17 | <sect3 id="sect.Geom.ConvGeom.App"> |
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18 | <title> |
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19 | Approach |
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20 | </title> |
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21 | |
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22 | <para> |
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23 | <emphasis role="bold">G3toG4</emphasis> is the Geant4 facility to convert |
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24 | GEANT 3.21 geometries into Geant4. This is done in two stages: |
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25 | |
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26 | <orderedlist spacing="compact"> |
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27 | <listitem><para> |
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28 | The user supplies a GEANT 3.21 RZ-file (.rz) containing the |
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29 | initialization data structures. An executable <literal>rztog4</literal> reads |
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30 | this file and produces an ASCII <emphasis>call list</emphasis> file containing |
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31 | instructions on how to build the geometry. The source code of |
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32 | <literal>rztog4</literal> is FORTRAN. |
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33 | </para></listitem> |
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34 | <listitem><para> |
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35 | A call list interpreter (<literal>G4BuildGeom.cc</literal>) reads these |
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36 | instructions and builds the geometry in the user's client code for |
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37 | Geant4. |
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38 | </para></listitem> |
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39 | </orderedlist> |
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40 | </para> |
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41 | |
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42 | </sect3> |
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43 | |
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44 | <!-- ******************* Section (Level#3) ****************** --> |
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45 | <sect3 id="sect.Geom.ConvGeom.Import"> |
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46 | <title> |
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47 | Importing converted geometries into Geant4 |
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48 | </title> |
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49 | |
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50 | <para> |
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51 | Two examples of how to use the call list interpreter are |
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52 | supplied in the directory <literal>examples/extended/g3tog4</literal>: |
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53 | |
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54 | <orderedlist spacing="compact"> |
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55 | <listitem><para> |
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56 | <literal>cltog4</literal> is a simple example which simply invokes the |
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57 | call list interpreter method <literal>G4BuildGeom</literal> from the |
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58 | <literal>G3toG4DetectorConstruction</literal> class, builds the geometry and |
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59 | exits. |
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60 | </para></listitem> |
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61 | <listitem><para> |
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62 | <literal>clGeometry</literal>, is more complete and is patterned as for |
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63 | the novice Geant4 examples. It also invokes the call list |
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64 | interpreter, but in addition, allows the geometry to be visualized |
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65 | and particles to be tracked. |
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66 | </para></listitem> |
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67 | </orderedlist> |
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68 | </para> |
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69 | |
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70 | <para> |
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71 | To compile and build the G3toG4 libraries, you need to have set in |
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72 | your environment the variable <literal>G4LIB_BUILD_G3TOG4</literal> at the |
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73 | time of installation. The G3toG4 libraries are not built by |
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74 | default. Then, simply type |
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75 | |
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76 | <informalexample> |
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77 | <programlisting> |
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78 | gmake |
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79 | </programlisting> |
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80 | </informalexample> |
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81 | |
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82 | from the top-level <literal>source/g3tog4</literal> directory. |
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83 | </para> |
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84 | |
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85 | <para> |
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86 | To build the converter executable <literal>rztog4</literal>, simply |
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87 | type |
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88 | |
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89 | <informalexample> |
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90 | <programlisting> |
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91 | gmake bin |
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92 | </programlisting> |
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93 | </informalexample> |
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94 | </para> |
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95 | |
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96 | <para> |
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97 | To make everything, simply type: |
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98 | |
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99 | <informalexample> |
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100 | <programlisting> |
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101 | gmake global |
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102 | </programlisting> |
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103 | </informalexample> |
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104 | </para> |
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105 | |
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106 | <para> |
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107 | To remove all <literal>G3toG4</literal> libraries, executables and .d files, |
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108 | simply type |
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109 | |
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110 | <informalexample> |
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111 | <programlisting> |
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112 | gmake clean |
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113 | </programlisting> |
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114 | </informalexample> |
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115 | </para> |
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116 | |
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117 | </sect3> |
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118 | |
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119 | <!-- ******************* Section (Level#3) ****************** --> |
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120 | <sect3 id="sect.Geom.ConvGeom.Curr"> |
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121 | <title> |
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122 | Current Status |
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123 | </title> |
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124 | |
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125 | <para> |
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126 | The package has been tested with the geometries from experiments |
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127 | like: BaBar, CMS, Atlas, Alice, Zeus, L3, and Opal. |
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128 | </para> |
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129 | |
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130 | <para> |
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131 | Here is a comprehensive list of features supported and not |
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132 | supported or implemented in the current version of the package: |
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133 | |
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134 | <itemizedlist spacing="compact"> |
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135 | <listitem><para> |
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136 | Supported shapes: all GEANT 3.21 shapes except for |
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137 | <literal>GTRA</literal>, <literal>CTUB</literal>. |
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138 | </para></listitem> |
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139 | <listitem><para> |
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140 | <literal>PGON</literal>, <literal>PCON</literal> are built using the |
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141 | <emphasis>specific</emphasis> solids <literal>G4Polycone</literal> and |
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142 | <literal>G4Polyhedra</literal>. |
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143 | </para></listitem> |
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144 | <listitem><para> |
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145 | GEANT 3.21 <literal>MANY</literal> feature is only partially |
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146 | supported. |
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147 | <literal>MANY</literal> positions are resolved in the |
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148 | <literal>G3toG4MANY()</literal> function, which has to be processed before |
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149 | <literal>G3toG4BuildTree()</literal> (it is not called by default). |
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150 | In order to resolve <literal>MANY</literal>, the user code has to provide |
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151 | additional info using <literal>G4gsbool(G4String volName, G4String |
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152 | manyVolName)</literal> function for all the overlapping volumes. |
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153 | Daughters of overlapping volumes are then resolved automatically |
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154 | and should not be specified via <literal>Gsbool</literal>. |
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155 | <para> |
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156 | <emphasis role="bold">Limitation</emphasis>: a volume with a |
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157 | <literal>MANY</literal> position can have |
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158 | only this one position; if more than one position is needed a new |
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159 | volume has to be defined (<literal>gsvolu()</literal>) for each |
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160 | position. |
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161 | </para> |
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162 | </para></listitem> |
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163 | <listitem><para> |
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164 | <literal>GSDV*</literal> routines for dividing volumes are implemented, |
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165 | using <literal>G4PVReplica</literal>s, for shapes: |
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166 | |
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167 | <itemizedlist spacing="compact"> |
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168 | <listitem><para> |
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169 | <literal>BOX</literal>, <literal>TUBE</literal>, |
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170 | <literal>TUBS</literal>, <literal>PARA</literal> - all axes; |
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171 | </para></listitem> |
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172 | <listitem><para> |
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173 | <literal>CONE</literal>, <literal>CONS</literal> - axes 2, 3; |
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174 | </para></listitem> |
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175 | <listitem><para> |
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176 | <literal>TRD1</literal>, <literal>TRD2</literal>, |
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177 | <literal>TRAP</literal> - axis 3; |
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178 | </para></listitem> |
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179 | <listitem><para> |
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180 | <literal>PGON</literal>, <literal>PCON</literal> - axis 2; |
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181 | </para></listitem> |
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182 | <listitem><para> |
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183 | <literal>PARA</literal> -axis 1; axis 2,3 for a special case |
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184 | </para></listitem> |
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185 | </itemizedlist> |
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186 | </para></listitem> |
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187 | <listitem><para> |
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188 | <literal>GSPOSP</literal> is implemented via individual logical volumes |
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189 | for each instantiation. |
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190 | </para></listitem> |
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191 | <listitem><para> |
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192 | <literal>GSROTM</literal> is implemented. Reflections of hierachies based |
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193 | on plain CSG solids are implemented through the <literal>G3Division</literal> |
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194 | class. |
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195 | </para></listitem> |
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196 | <listitem><para> |
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197 | Hits are not implemented. |
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198 | </para></listitem> |
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199 | <listitem><para> |
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200 | Conversion of GEANT 3.21 magnetic field is currently not |
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201 | supported. However, the usage of magnetic field has to be turned on. |
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202 | </para></listitem> |
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203 | </itemizedlist> |
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204 | </para> |
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205 | |
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206 | |
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207 | </sect3> |
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208 | </sect2> |
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