The Field Files in Final Fantasy VII are found in the FLEVEL.LGP file, and they are always LZSS-compressed. You must first decompress an LZSS-compressed Field File (e.g. using lzss_decompress.py) before you can play with it. This wiki is a useful reference for the general structure of the Field File. It is broken down into the following 9 sections:

• Section 1: Field Script
• Section 2: Camera Matrix
• Section 3: Model Loader
• Section 4: Palette
• Section 5: Walkmesh
• Section 6: Tile Map (unused)
• Section 7: Encounter
• Section 8: Triggers
• Section 9: Background

A Field File's File Header is essentially just a table storing information about where the other sections are located in the file.

The first 2 bytes of the File Header are just <NULL> (i.e., 0x0).

The next 4 bytes of the File Header list the number of sections in the file. It should be 9.

The first 4 bytes are an unsigned integer representing the start position of Section 1, the next 4 bytes representing the start of Section 2, etc.

Following the File Header are the actual 9 sections of the Field File. Refer to the links in the list above for information about each section.

• File Header

  • 2 bytes (<NULL>)
  • 4 bytes (Number of Sections = 9)
  • 4 bytes (Section 1 Start Position)
  • ...
  • 4 bytes (Section 9 Start Position)

• Section 1: Field Script

  • 4 bytes (Section Length)
  • Section Header
    • 2 bytes (unknown)
    • 1 byte (Number of Actors, n_A)
    • 1 byte (Number of Models)
    • 2 bytes (String Table Offset)
    • 2 bytes (Number of Akao/Tutorial Blocks, n_B)
    • 2 bytes (Scale of Field)
    • 3 bytes (<NULL> Bytes)
    • 8 bytes (Field Creator)
    • 8 bytes (Field Name)
    • Actor Names (n_A entries)
      • 8 bytes (Actor Name 1)
      • ...
    • Akao/Tutorial Block Offsets (n_B entries)
      • 4 bytes (Akao/Tutorial Block Offset 1)
      • ...
    • Actor Scripts (n_A entries)
      • Scripts for Actor 1 (32 entries)
        • 2 bytes (Actor 1 Script 1)
        • ...
      • ...
  • String Table (starts at String Table Offset)
    • 2 bytes (Number of Strings, n_S)
    • String Offsets (n_S entries)
      • 2 bytes (String 1 Offset)
      • ...
    • Strings (n_S entries)
      • ? bytes (String 1) (start at String 1 offset, end at first 0xFF)
      • ...
  • 0-3 bytes (<NULL> bytes)
  • *Akao/Tutorial Blocks (n_B entries)
    • ? bytes (Akao/Tutorial Block 1) (start at Block Offset 1, end at Block Offset 2)
    • ...

• Section 2: Camera Matrix

  • 4 bytes (Section Length)
  • Camera Matrix (n_CM = (section length / 38) entries)
    • Camera 1 x-Axis Vector
      • 2 bytes (x-Axis Vector Dimension 1)
      • 2 bytes (x-Axis Vector Dimension 2)
      • 2 bytes (x-Axis Vector Dimension 3)
    • Camera 1 y-Axis Vector
      • 2 bytes (y-Axis Vector Dimension 1)
      • 2 bytes (y-Axis Vector Dimension 2)
      • 2 bytes (y-Axis Vector Dimension 3)
    • Camera 1 z-Axis Vector
      • 2 bytes (z-Axis Vector Dimension 1)
      • 2 bytes (z-Axis Vector Dimension 2)
      • 2 bytes (z-Axis Vector Dimension 3)
    • 2 bytes (Camera 1 z-Axis Vector Dimension 3 Duplicate)
    • 4 bytes (Camera 1 x-Axis Space Position)
    • 4 bytes (Camera 1 y-Axis Space Position)
    • 4 bytes (Camera 1 z-Axis Space Position)
    • 4 bytes (Camera 1 Blank)
    • 2 bytes (Camera 1 Zoom)

• Section 3: Model Loader

  • 4 bytes (Section Length)
  • Section Header
    • 2 bytes (<NULL> Bytes)
    • 2 bytes (Number of Models, n_M)
    • 2 bytes (Scale)
    • Model Data (n_M entries)
      • 2 bytes (Size of Model 1 Name, n_MN)
      • n_MN bytes (Model 1 Name)
      • 2 bytes (Model 1 Unknown Attribute)
      • 8 bytes (Model 1 HRC Name)
      • 4 bytes (Model 1 Scale)
      • 2 bytes (Model 1 Number of Animations, n_A)
      • 3 bytes (Model 1 Light 1 Color)
      • 6 bytes (Model 1 Light 1 Coordinates)
      • 3 bytes (Model 1 Light 2 Color)
      • 6 bytes (Model 1 Light 2 Coordinates)
      • 3 bytes (Model 1 Light 3 Color)
      • 6 bytes (Model 1 Light 3 Coordinates)
      • 3 bytes (Model 1 Global Light Color)
      • Model 1 Animations (n_A entries)
        • 2 bytes (Size of Animation 1 Name, n_AN)
        • n_AN bytes (Animation 1 Name)
        • 2 bytes (Animation 1 Unknown Attribute)
        • ...
      • ...

• Section 4: Palette

  • 4 bytes (Section Length)
  • Section Header
    • 4 bytes (Section Length, again)
    • 2 bytes (PalX)
    • 2 bytes (PalY)
    • 2 bytes (Number of Colors per Page, n_C)
    • 2 bytes (Number of Pages, n_P)
    • Color Data (n_C * n_P entries)
      • 2 bytes (Color 1)
      • ...

• Section 5: Walkmesh

  • 4 bytes (Section Length)
  • Section Header
    • 4 bytes (Subsection 2 Offset)
    • 4 bytes (Subsection 3 Offset)
    • 4 bytes (Subsection 4 Offset)
    • 4 bytes (Subsection 5 Offset)
  • Subsection 1
    • TODO