I've tried to make some user-friendly and instructive headers for crater.pov
and crater_dat.pov, but I'm no expert in file formats so I'd appreciate if
people who knows more about it than me would check if it's all correct and
if maybe it could be worded better.

Header comments in crater.pov:
// Persistence Of Vision raytracer version 3.5 sample file.
// CRATER.POV
// Render CRATER_DAT.POV to create the height_field image that
// is needed in CRATER.POV (this file). Then render this file.
//
// ( When CRATER.POV is rendered, the output image type must be
// the same as when CRATER_DAT.POV was rendered. That is how it
// works when no image type is specified in the height_field.
// Alternatively you can specify the image type of the
// height_field object in line 23 in CRATER.POV. See the
// documentation for details. )

Header comments in crater_dat.pov:
// Persistence Of Vision raytracer version 3.5 sample file.
// CRATER_DAT.POV
// Render CRATER_DAT.POV (this file) to create the height_field
// image that is needed in CRATER.POV. Then render CRATER.POV.
//
// ( You can use any output image type, but the quality will be
// best with the special 16-bit gray output that is supported
// by the PNG, TGA and PPM image types. See the documentation
// for details. )

Rune

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