This property is used by scripts such as TrapTexture, which allow brushes to be retextured ingame. It states which texture is to be shown when the object is turned on. The value is of the form fam\family-name\texture-name, e.g. fam\city\win324l
This texture only replaces instances of the texture specified in Script → TerrReplaceOff, so a ‘window off’ texture will be replaced by ‘window on’, but the surrounding wall will remain intact.
Property Name: TerrRepOn