Nextsectorneighborz
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nextsectorneighborz <starting sector> <starting z> <ceiling or floor (-1 or 1)> <up or down (-1 or 1)>
Finds the nearest sector to <starting sector> based on z position by searching for a <ceiling or floor> from the <starting z>, and scanning <up or down>. Note: The only valid values for the last two parameters are -1 or 1.
RETURN will be the sectnum found. If RETURN is -1, then nothing was found by the search.