3D mode FOFs
There are a bunch of issues that are exclusive to FOFs in 3D mode.
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Medium Priority - In 3D mode, FOF sides are aligned according to both the control linedef and the in-map linedef. This is inaccurate for SRB2, where the X offset is set by the in-map linedef and the Y offset by the control linedef. -
Medium Priority - Autoaligning an FOF causes the control linedef's X offset to the changed even though that has no effect. -
HIGH PRIORITY - Find a way to render only planes/only sides for FOFs, for the linedef types that only use one or the other. -
pipe dream - Support the Transfer Line flag for FOFs, which allows each side to be assigned a different texture.