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Except that i'm not satisfied. It would appear that we're computing
various distances more-or-less exactly in the sprite rendering
process, but this is at odds with the walls and floors which -- by
virtue of the linear interpolation garbage -- don't agree about where
things are.
The net result is that there are at least two fudge factors:
- to account to for the incorrect height of the floors i shift the
sprites up by 0.2
- to account for the incorrect wall distances i add 1 to the z_buffer
comparison
These fudges are ugly and empirical.
Still to do: for more than one object we have to sort by distance first!
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