Floor Piano — COG Factory

A row of floor tiles, each its own surface, each wired to a note. Walk across them and the room plays. The first project where a generated level does something.

A surface entered message does reach a COG for the player, and N generated floor keys each play a distinct note.

project	p03-piano
date	2026-08-22
package	P03.GOB, readme.txt, screenshot.jpg
build	1 — 2026-09-05
sha256	06bc0e8f13f92e345fd1fb21c5d9a3d0317a871d4a0a16d0aee6bc8440ef9fdd

Installing it

P03.GOB is a level. Unzip it and drop the GOB into your episode folder.
Pick it from the episode list.

The GOB carries its own level and cogs.

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

One of these 2 tiles is a harness working frame (320×240), flagged on the tile: not yet re-shot at 1280×720 with the HUD and dev text off.

in engine

in engine320×240 working frame

The readme that ships with it

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

 P03.GOB

 Does a surface 'entered' message reach a COG for the player, and can N
 generated floor keys each play a distinct note?

 [cogfactory / p03-piano]

 BUILD 1  --  2026-09-05
 sha256 06bc0e8f13f92e345fd1fb21c5d9a3d0

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

THIS PACKAGE
------------------------------------------------------------------------
  P03.GOB          the level
  readme.txt       this file
  screenshot.jpg   what it looks like

INSTALLATION
------------------------------------------------------------------------
Drop P03.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.

WHAT IS IN THE GOB
------------------------------------------------------------------------
        88  episode.jk
      6865  jkl\piano.jkl
      1909  cog\piano.cog
      1116  cog\pianoprobe.cog

      9978  bytes in 4 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.

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