Salome and cfMesh parametrization

== '''Tips''' ==
When I created first few meshes, cfMesh created hole where Ahmed body is. Something like in the picture on the right.

[[File:cfMesh_error.jpg|thumbnail|150x70px|cfMesh error]]

My first guess was, that happened because patch Ahmed in .stl file had face vectors pointing in wrong direction (because they were created from another volume in Salome). Vectors are defined in .stl file as "facet normal [VECTOR VALUES]". It can be seen in Bottom.stl in 2. line ("facet normal  0.000000e+00  0.000000e+00 -1.000000e+00").
At that point I have written another bash script that rotates face vectors in .stl file. After I finished script I realized it is not necessary. Face vectors weren't problem to cfMesh. The problem was mesh was set to coarse. Afterwards I realized '''IF cfMesh DOES SOMETHING THAT YOU DIDN'T WANT (LIKE THAT HOLE I SHOWED OR DOESN'T REFINE MESH IN SOME SPECIFIED AREA) PROBLEM IS IN meshDict AND REFINEMENT SETTINGS'''.
If somebody has some other experiences please do share. :)

Still I will put here that vector rotating script. Maybe someone will find it handy for something else.
  #!/bin/bash 
  # how to run it: ./vectorRotation [PATH TO .stl FILE] (eg. ./vectorRotation ./mergedStl.stl)
  
  # get file name and location 
  filePath=$(cd `dirname "$1"` && pwd) 
  # get file name with extension
  fileNameExt=$(basename $1) 
  # get the file name without extension
  fileName=`echo "$fileNameExt" | cut -f1 -d'.'` 
  
  # remove inverted file if it already exist 
  if [ -f $filePath/inverted$fileNameExt ]; then 
      rm $filePath/inverted$fileNameExt 
  fi 
  
  # read file line by line 
  while read line 
  do 
      # check if line has string facet normal	 
      if [[ "$line" == *"facet normal"* ]] 
      then 
          # if it has, extract vector coordinates 
          x[1]=$(echo "$line" | awk -F' ' '{print $3}') 
          x[2]=$(echo "$line" | awk -F' ' '{print $4}') 
          x[3]=$(echo "$line" | awk -F' ' '{print $5}') 
          # rotate vector coordinates 
          i=0 
          # go trough x array created one step above 
          for num in "${x[@]}" 
          do 
              i=$[$i +1] 
              # check if number is negative
              if [[ $num == -* ]] 
              then 
                  # if truth remove first number character (that is minus sign)
                  x[i]=${x[$i]#?} 
              else 
                  # if false prepend minus sign to number
                  x[i]="-${num}" 
              fi 
          done 
          # reconstruct line with new numbers 
          ortLine=" facet normal " 
          # append numbers to first string facet normal
          for string in "${x[@]}"		 
          do 
              ortLine="$ortLine $string" 
          done; 
          # push reconstructed line to inverted .stl file
          echo "$ortLine" >> $filePath/inverted$fileNameExt 
      else 
          # if the line doesn't have string facet normal push the line to inverted .stl file
          echo "$line" >> $filePath/inverted$fileNameExt 
      fi 
  done < $1 
  
  # remove .stl extension from original file (so it is invisible to other scripts) 
  mv $filePath/$fileNameExt $filePath/$fileName