vcaps -ffp 1
vexport ${aFile} ${format}
vglinfo
checkview -screenshot -3d -path ${imagedir}/${test_image}.png

if { [file exists ${aFile}] } {
    puts "The file has been exported to ${format}."
    set filesize [file size ${aFile}]

    # Check if difference of size is more 5%
    if { $filesize < $size && [expr 1.*($size - $filesize)/$size] > 0.05 } {
        puts "Error: The file has been exported to ${format}, but the result has a different size ($filesize instead of $size)."
    }
} else {
    puts "Error: Impossible to export file to ${format}."
}