ViewingGeometryPerFacet outputs similar data to GetSpots, but also includes lat/lon of each facet center. The inputs and outputs are formatted different.

 /!\ '''ViewingGeometryPerFacet''' requires an obj file.

Example Input:
 * eval_tools/altwg-2020.08.13-macosx-x64/bin/ViewingGeometryPerFacet -date 2018 Nov 27 09:06:17 -obj shape-apV24-512.obj -observer OSIRIS-REX -output VGP_output -spice spoc-jweirich-2018-12-05T17_18_14.888Z_modified.mk -target BENNU


Help:
ALTWG Tools version 76219 (built on 2020-Aug-13)

usage: ViewingGeometryPerFacet [options]
 * -date <arg>       Required.  Observation date.  Format can be anything readable by the SPICE str2et method.
 * -frame <arg>      Shape model reference frame.  Default is IAU_{target}.
 * -logFile <arg>    If present, save screen output to log file.
 * -logLevel <arg>   If present, print messages above selected priority. Valid values are ALL, OFF, SEVERE, WARNING, INFO, CONFIG, FINE, FINER, or FINEST.  Default is INFO.
 * -obj <arg>        Required.  Shape model for target body.
 * -observer <arg>   Required.  SPICE name of observer.
 * -output <arg>     Output filename.  Default is to print to console.
 * -spice <arg>      SPICE kernel(s) to load.  Multiple kernels may be specified separated by whitespace.
 * -target <arg>     Required.  SPICE name of target.


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 * This program calculates the viewing geometry for a shape model at each facet visible from the observer.
 * If the image does not cover a facet, a line for that facet is not printed.