Cave(.cave) File Format
_-----------------------_

#comment

model model_file(.obj)		# cave geometry

facet[%u]			# index of facet
				# Default: 0

side[%u]			# index of side of facet
				# Default: 0

Xscale[%f]			# horizontal field-of-view scale
				# Default: 1

Yscale[%f]			# vertical field-of-view scale
				# Default: 1

Xskew[%f]			# degree of horizontal skew
				# Default: 0

Yskew[%f]			# degree of vertical skew
				# Default: 0

Zrotation[%f]			# rotation about line-of-sight
				# Default: 0

 3Dengine Notes
----------------
All of the above are optional.  Multiple cave files may be used in succession.
The only data in the cave geometry OBJ file that is used is the vertices and
faces.  No other transformation or display tags are considered. Zrotation cannot
be set until a model has been specified.