I've run into the same problem. The regular Mac release of POVRay is a GUI
tool. Usually that's nice, but occasionally I want the command line interface
and there isn't any way to get to it.
For example, FreeCAD has a "render" tool that can feed scene descriptions to
ray-tracers such as POV-Ray. It does so by creating the .pov file and then
invoking POVRay as a command line utility. But on Mac that doesn't work because
it can't be configured to be told what to do using Unix command line arguments
-- even though Mac OS is a Unix.
Some graphics applications have a command line switch to say "turn off GUI"
(like "-batch" or the like); it would be useful for POVRay to offer something
along those lines.
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