if { [info exists square] } {
    set prop "square"
    set mass $square
    if { [info exists tol_square] } {
      # tol_square - The epsilon defines relative precision of computation
      regexp {Mass +: +([-0-9.+eE]+)} [sprops result $tol_square] full m
    } else {
      regexp {Mass +: +([-0-9.+eE]+)} [sprops result] full m
    }
}
if { [info exists length] } {
    set prop "length"
    set mass $length
    regexp {Mass +: +([-0-9.+eE]+)} [lprops result] full m      

    puts "checksection"
    puts [checksection result]
}

#if mass (length or square) is empty in test case then result should be an empty shape.
if { [info exists mass] } {
    if { [string compare $subgroup "moddata"] != 0 } {
      puts "checkshape"
      checkshape result
    }
      
    if { [string compare "$mass" "empty"] != 0 } {
      if { $m == 0 } {
        puts "Error : The command is not valid. The $prop is 0."
      }
      if { $mass > 0 } {
        puts "The expected $prop is $mass"
      }
      #check of change of square is < 1%
      if { ($mass != 0 && [expr 1.*abs($mass - $m)/$mass] > 0.01) || ($mass == 0 && $m != 0) } {
        puts "Error : The $prop of result shape is $m"
      }
    } else {
      if { $m != 0 } {
        puts "Error : The command is not valid. The $prop is $m"
      }
    }
}

if { [info exists rel_tol] } {
   puts "\nChecking triangulation area (triarea command)..."
   set rel_err [expr abs([CheckTriArea result $area_eps])]
   if { $rel_err > $rel_tol } {
      puts "Error   : area by triangles differs from the actual area by $rel_err %"
   } else {
      if { $rel_tol > 1 && $rel_tol < 100 } {
        puts "Error: Improvement: The current area difference is $rel_err instead of $rel_tol"
      }
   }
}

if { [isdraw result] } {
  if { [info exists 2dviewer] } {
    clear
    smallview
    donly result
    fit
    xwd $imagedir/${test_image}.png
  }
  if { [info exists 3dviewer] } {
    #for multiview support: dump result from all opened views
    set view_str [vviewlist long]
    if { [llength ${view_str}] == 0 } {
       vinit
       set view_str [vviewlist long]
    }
    set view_list [regexp -all -inline {\S+} $view_str]
    foreach {view_name} $view_list {
      vactivate $view_name
      vclear
      vdisplay result
      vsetdispmode 1
      vfit
      vzfit
      vdump $imagedir/${test_image}_[regsub -all {/} $view_name {_}].png
    }
  }
}

if { [info exists only_screen] } {
  #for multiview support: dump result from all opened views
  set view_str [vviewlist long]
  set view_list [regexp -all -inline {\S+} $view_str]
  foreach {view_name} $view_list {
    vactivate $view_name
    vdump $imagedir/${test_image}_[regsub -all {/} $view_name {_}].png
  }
}

if { [info exists only_screen_axo] } {
   xwd $imagedir/${test_image}.png
}

# to end a test script
puts "TEST COMPLETED"