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Here are some useful geometric objects and relations.
- Two dimensional objects--regions including chambers. We have
already discussed them.
- One dimensional objects--segments and walls. A segment is
a surface over which lemmings can walk. Mostly we are concerned
with segments bounded by walls or drop-offs or other impediment
to walkers. However, segments bounded by being above a hill at
a lower level may need to be an object because digging in that
segment has a different result than digging elsewhere.
On walls useful segments are bounded by overhangs as well as floors
and ceilings, because climbers can't climb overhangs.
- Bridges and segments of bridges require special treatment, because
they are dynamic until completed. Even when it is complete, it is sometimes
necessary to break a bridge into two segments using a digger.
- The adjacency relations and containment relations among geometric
objects are used.
Mon Mar 2 16:21:50 PDT 1998