added: -vtffile and file attribute to <vtfformat> tag

allows specifying the vtf file to use

src/SIM/SIMoptions.C

@@ -147,6 +147,11 @@ bool SIMoptions::parseOutputTag (const TiXmlElement* elem)
       else if (!strcasecmp(elem->FirstChild()->Value(),"binary"))
         format = 1;
     }
+    if (utl::getAttribute(elem,"file",vtf)) {
+      size_t pos = vtf.find_last_of('.');
+      if (pos < vtf.size())
+        vtf.erase(pos);
+    }
     if (utl::getAttribute(elem,"nviz",nViz[0]))
       nViz[2] = nViz[1] = nViz[0];
     utl::getAttribute(elem,"nu",nViz[0]);
@@ -308,6 +313,11 @@ bool SIMoptions::parseOldOptions (int argc, char** argv, int& i)
     else // use the default output file name
       hdf5 = "(default)";
   }
+  else if (!strcmp(argv[i],"-vtffile"))
+  {
+    if (i < argc-1 && argv[i+1][0] != '-')
+      vtf = strtok(argv[++i],".");
+  }
   else if (!strcmp(argv[i],"-saveInc") && i < argc-1)
     dtSave = atof(argv[++i]);
   else if (!strcmp(argv[i],"-restart") && i < argc-1)

src/SIM/SIMoptions.h

@@ -91,6 +91,7 @@ public:
   bool saveNorms;//!< If \e true, save element norms
 
   std::string hdf5; //!< Prefix for HDF5-file
+  std::string vtf; //!< Prefix for VTF file
 
   // Restart options
   int         restartInc;  //!< Number of increments between each restart output

src/SIM/SIMoutput.C

@@ -274,6 +274,9 @@ bool SIMoutput::writeGlvG (int& nBlock, const char* inpFile, bool doClear)
   {
     if (myVtf) return false;
 
+    if (!opt.vtf.empty())
+      inpFile = opt.vtf.c_str();
+
 #if HAS_VTFAPI == 2
     const char* ext = ".vtfx";
 #else