Floor Span Glitches

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Occasionally, horizontal spans of floor texture glitch across the screen, usually vertically centred. These tend to have the floor texture of nearby zones, suggesting that transformation of an adjoining zone floor/ceiling polygon has overflowed.

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It seems many of these (though not all) have been eliminated during the PVS enhancements. It's quite possible there were many that were triggered by the invalid rendering of zones fully or partially behind the player viewpoint.