Wrp File Format - 4WVR

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General

Flashpoint wrp files use two different file formats to contain the data. This document contains information on unbinarised 4WVR format as used by WrpTool and Visitor 2.

This document does not discuss the binary format, OPRW. Both file formats can be used directly by the engine, whether the file exists independently in ~\worlds, or, packed inside a pbo (addon).

See Island File Formats for further info.

"Binarize" tool by BIStudio will convert 4WVR to OPRW if desired.

(some problems exist with 2 versions of binarize)

For a general description of how simple this (or any other) wrp file construct, see 8WVR format

Conventions

see Generic FileFormat Data Types

Structure

4WVR
{
  WRP4Header          Header
  CompressedFloats    Elevations  [Ysize][Xsize]; // in centimetres. See below 
  ushort              TextureIndex[Ysize][Xsize]; //Each 'index' refers to a filename below. Range 1..511
  char                TextureFilenames[512][32];  //"data\pi.paa\0|data\pi1.paa\0".....
  Model               Models[...];
}

WRP4Header

WRP4Header
{
char Signature[4]; //"4WVR"
ulong Xsize;       //(=256) cell dimension
ulong Ysize;       //(=256) cell dimension
}

Elevations

Elevations are expressed as an integral of the gridsize.

Since the gridsize for Operation Flashpoint is a fixed 50 meters, to convert the value into meters:

RealHeight = Elevations[x][y] * 0.05;

Note that (probably WrpTool) can set a default index of -1 (0xFFFF). The meaning is unclear.

see Talk

TextureIndex

Each cell on the map references an texture file (pac/paa) and an elevation for that text at that cell position. Since there could be myriads of 'sea' texture (eg), rather than have each cell list it is texture, it references a texture list via an index. In this way, THE texture which is common to many cells (at sometimes differing elevations) is only stored once.

A fixed (and therefore max) table size of 512 texture filenames can be listed. Each is held as an asciiz string inside a fixed 32 byte record. Eg max length of filename is 31 characters. Each 32 byte record can contain garbage after the Asciiz. The first null entry is considered the end of the usable list.

The first entry (effectively index0) is never used. Even though a filename is associated with this entry. it is never accessed.

Model

Model
{
 float  TransformMatrix[4][3]; // see Generic FileFormat Data Types
 long   ObjectID;              // unique for every entry
 asciiz P3DFilename[76];       // "data3d\kasna.p3d"
}

The number of models varies from none, to end of file. Each model is 128 bytes in length.

Note that this is in marked contrast to an 8WVR file. In 8WVR, there is always a minimum of one entry. The last (or only) entry in an 8WVR has no filename associated with it.

FilePaths

Despite the impression given (lack of a leading \) All filenames (pac/paa and p3d files) are HARD WIRED to the (virtual) pboRoot\ directory.

The PboRoot\ directory is built in-situ during game load and consists of an index table of all addons from 'anywhere' in the game structure. Eg, the official Addon Directories (plural), the bin\folder, plus any oem addons stated in the command line.