||Shown here is a fake 3D bridge in the first map of Mordeth. Below the bridge you can see the mossy floor all the way, while the floor of the bridge itself consists of a different texture, in this case wooden planks.
This bridge is fixed and can only be walked over, not under. It appears to have two different floor textures for one sector (mossy rocks below the bridge; but wood as the actual bridge floor) which is the main difference with bridges consisting of 'invisible platforms', made by referring both sidedefs of every linedef that make up a raised sector to itself. A disadvantage of this technique is that this bridge will give HOM when viewed from a height less then 64 units (that is, low enough for the player to see the 'top' of the faked bridge floor) below the invisible raised sector of the bridge.
1 : ceiling/floor 256/0, floor texture Y;
2 : ceiling/floor 256/0, floor texture Y;
3 : ceiling/floor 256/64, floor texture X;
4 : ceiling/floor 256/64, floor texture X
a : has missing lower textures;
b/c : blocks all
The trick is to remove the lower textures of sector 3. The sides of the bridge should have a 'block all' property set. To add railing, add middle textures with the correct offsetts to 'b' and 'c'. Standing on top of the bridge sector 3 appears to have a floor texture X, but looking from the sides it appears to be Y instead.
To minimise the gap between sector 2 and 3 you could break up linedefs 'a' into two, and connecting the corner nodes with sector 4. Do not share linedefs of sector 3 with other sectors, or the effect will be ruined. Works properly with most nodesbuilders.
Bridges that consist of a raised, self-referencing sector (such as the ones seen in Requiem do not display any HOM, but they do not have a floor texture either... the player seems to be walking on air. To make it look real those bridges have 'floors' of suspended middle textures, such as STEPTOP. For an example check out the (dynamic) 3D bridge tutorial.
Introduction | Regular Doom Tricks | TeamTNT's Boom Support
Window above Window | Other 3D Appearances |
Transparent Door | Shadowcasting |
Fake Bridge | 3D Bridge |
Double 3D Bridge | Two-storied Room |
Swinging Doors |
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