Page "Hexen: Beyond Heretic" Paragraph 5
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Because the Doom engine uses the binary space partitioning system for rendering, it does not enable moving walls.
Hexen < nowiki >'</ nowiki > s moving walls are actually one-sided lines built somewhere else on the map and rendered at the desired start spot when the level is loaded.
This enables a pseudo-moving wall but does not allow moving sectors ( such as seeing the tops of moving doors ).
This often creates problems in sectors which contain more than one node, explaining the relatively limited use of polyobjects.
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