[bug] 1.0.0 is not a number.

[DapengFeng]

./main init 1.0.0

Usage: main [options...] [SUBCOMMAND: init, ]

Options:
        -h,--help : print help [implicit: "true", default: false]


Subcommand: init
Usage: init arg_0  [options...]
            arg_0 : Density of the scene [required]

Options:
        -p,--path : Path to the scene file [default: init]
       -s,--scale : Scale of the scene [default: 1]
        -h,--help : print help [implicit: "true", default: false]
            -h,--help : false

--- Subcommand: init
            -p,--path : init
           -s,--scale : 1
    arg_0(Density...) : 1.0.0
            -h,--help : false

Density of the scene: 1