Sewer Tunnel — COG Factory

Q. Can a corridor be radial in CROSS-SECTION — an octagonal tunnel bore — rather than radial in plan?

Yes — and the detail pass found what the section is actually worth. State it ONCE as eight half-planes and the same lines that cut the bore carve its MOUTH into a chamber's flat wall, so a tunnel arrives in a room as a tunnel. That mouth is also the trap: SED repairs T-junctions, so every course and rib landing on the wall beside it plants a vertex on the adjoin's outline — thirty of them, against an engine cap of 24 (sithSurface.c:309) past which the level does not load. Pin the chamber's courses to lines the mouth already has. The gutter was a trap too: 0.10 deep against a 0.070 step-up, so anyone who stepped in the water was stuck there forever.

archetype	Sewer tunnel
project	p37-sewer-tunnel
date	2026-08-30
built	10 sectors · 450 surfaces · 16 things · 30 lights
package	P37.GOB, readme.txt, screenshot.jpg
build	1 — 2026-09-05
sha256	cd6452f72cbf7b25a73ecfe3b1df8d4b0ba332a07adc170c0cc87e0cca9237d8

Installing it

Unzip it.
Drop the .GOB into the episode folder of a Jedi Knight install — the one that already has JK1.GOB in it.
Pick it from the episode list. On a libretro frontend, load the .GOB itself as content.

The GOB carries its own level, cogs, materials and sounds and reads the stock resource/ for everything else. There is no retail game data in the zip.

These are living projects, not finished releases. A level is rebuilt whenever something is learned — a lighting rule, a texture orientation, a whole detail pass — and it keeps its filename through all of it. The build number is how to tell which one you have: it is printed in the readme inside every zip, and it only moves when the level's bytes actually change.

Screenshots

reference

in engine

Textures generated for this project

$swwall$ $swledge$ $swvault$ $swwater$ $swrung$ $swtrim$

The readme that ships with it

========================================================================
 Jedi Knight Level

 P37.GOB

 An octagonal stone bore running under the city, with a water gutter
 down the middle and a dry ledge either side. It opens into a junction
 chamber, a flooded cistern, a sluice room, a maintenance corridor and
 a pump house -- and every tunnel mouth in a chamber wall is the shape
 of the tunnel, not a square hole.

 [cogfactory / p37-sewer-tunnel]

 BUILD 1  --  2026-09-05
 sha256 cd6452f72cbf7b25a73ecfe3b1df8d4b

 This level is not made or distributed by LucasArts
 Entertainment Co.
========================================================================

THIS PACKAGE
------------------------------------------------------------------------
  P37.GOB          the level
  readme.txt       this file
  screenshot.jpg   what it looks like

INSTALLATION
------------------------------------------------------------------------
Drop P37.GOB into the `episode` folder of a Jedi Knight install (the one
that already has JK1.GOB in it) and pick it from the episode list.
Nothing else needs to change: the GOB carries its own level, cogs,
materials and sounds, and reads the stock resource/ for everything else.

On a libretro frontend, point the core at the GOB itself. It needs a
folder beside it holding `resource/` from a real install -- that is
where the retail data lives and none of it is in here.

CONTROLS
------------------------------------------------------------------------
  Standard Jedi Knight controls -- this is a level, not a mod. Nothing
  is rebound and no script runs.

  You start at the south end of the tunnel. Walk north. The gutter is
  shallow enough to step through, so both ledges and both side rooms
  are reachable from anywhere.

NOTES
------------------------------------------------------------------------
  THE SECTION IS THE POINT. The tunnel is radial in CROSS-SECTION
  rather

  than in plan: a flat floor, canted lower walls, upright sides,
  canted

  upper walls and a flat crown, cut as four diagonal cleaves through a

  box. The two chamfers are deliberately DIFFERENT sizes -- a small
  one

  under foot so the ledge survives, a generous one overhead so the
  vault

  reads.



  The same eight lines that cut the bore also carve its mouth into the

  flat wall of every chamber it opens into, so a tunnel arrives in a

  room as a tunnel.



  ONE 128x128 TRIM SHEET does all the ironwork and all the wall
  courses:

  an algae waterline, a stone dado, rust bleeding down, and a riveted

  iron band -- plus the grates, the valve, the pipes and the pump,
  which

  are skinned from the same sheet's iron rows.



  Made with the COG Factory (openjkdf2). LucasArts did not make this
  and

  has nothing to do with it.

WHAT IS IN THE GOB
------------------------------------------------------------------------
        97  episode.jk
    121391  jkl\p37sewr.jkl
      2652  jkl\p37sewr.manifest.json
     12337  3do\swgrate.3do
      5586  3do\swpipe.3do
      5589  3do\swpump.3do
      5526  3do\swrung.3do
     22552  3do\swvalve.3do
     32908  mat\swledge.mat
     32908  mat\swrung.mat
     32908  mat\swtrim.mat
     32908  mat\swvault.mat
     32908  mat\swwall.mat
     32908  mat\swwater.mat

    373178  bytes in 14 entries

CREDITS
------------------------------------------------------------------------
  Generated by tools/cogfactory in the openjkdf2_libretro tree.

  The readme format is styled after SM Sith Lord's cog headers,
  because his are the ones everybody read.

========================================================================