You can even call rad from within a script.
Define only the common settings for rad within the rif file, and those that change after each rad command within the script (scene=___ PICTURE=___ ). Check the rad manual page for usage syntax.
A few of rad's variables assign naming of output files, including PICTURE, OCTREE, RAWFILE, and AMBFILE (others?). Be sure to assign these names differently for each option in the script, otherwise your output images will default to common rif file name, or you could accidentally share an ambient file between options.
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