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Changes: PSA File Format

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</div></div><br/><br/>
  
</div></div><br/><br/>
   
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==='''Pair Header'''===
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==='''Chunk Header'''===
   
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The pair header contains information about its paired data chunk: '''id''', '''type''', '''size''' and '''count'''. There are four possible IDs, corresponding to each of the eight mesh objects:
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The chunk header contains information about its companion data chunk: '''id''', '''type''', '''size''' and '''count'''. There are four possible IDs, corresponding to each of the eight mesh objects:
   
 
:* '''ANIMHEAD''': Does not contain a data pair.
  
:* '''ANIMHEAD''': Does not contain a data pair.
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The head data chunk is defined by its header as having zero size and zero elements (count). Since it contains no information, it derives that only the header chunk has useful meaning. The header chunk may act as a file-header, but does not necessarily have to be the first chunk in the file.<br/><br/>
  
The head data chunk is defined by its header as having zero size and zero elements (count). Since it contains no information, it derives that only the header chunk has useful meaning. The header chunk may act as a file-header, but does not necessarily have to be the first chunk in the file.<br/><br/>
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  +
==='''Bones'''===
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  +
The bones data chunk contains an array of bones. Each bone is defined as a 100 bytes struct.
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{| border="0" cellpadding="0" cellspacing="1" class="article-table mw-collapsible mw-collapsed" style="width: 320px;"
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|-
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! scope="col"|Bytes
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! scope="col"|Type
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! scope="col"|Description
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|-
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| 64
  +
| Char
  +
| Bone name
  +
|-
  +
| 4
  +
| Int32
  +
| Flags
  +
|-
  +
| 4
  +
| Int32
  +
| Children
  +
|-
  +
| 4
  +
| Int32
  +
| Parent index
  +
|-
  +
| 4
  +
| Float
  +
| Rotation X
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|-
  +
| 4
  +
| Float
  +
| Rotation Y
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|-
  +
| 4
  +
| Float
  +
| Rotation Z
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|-
  +
| 4
  +
| Float
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| Rotation W
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|-
  +
| 4
  +
| Float
  +
| Position X
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|-
  +
| 4
  +
| Float
  +
| Position Y
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|-
  +
| 4
  +
| Float
  +
| Position Z
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|-
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| 16
  +
| 4 * Int32
  +
| Padding
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|}<br/>
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  +
==='''Info'''===
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  +
==='''Keys'''===
   
 
==ME3Explorer Classes==
  
==ME3Explorer Classes==

Revision as of 21:19, 2 January 2015

Caution This page is currently being edited by Foggene (talk).


Overview

PSA and PSK binary files contain the raw animation and mesh information used to import skeletal animation art into the Unreal engine. The PSA file contains the bone names, one or more sequence names, and for each sequence, its frame number N, and tracks of N rotations and N translations for each bone. In Mass Effect 3, PSA data is included inside PCC files and can be exported using the PCC Editor tool integrated in ME3Explorer. To learn how to export and edit PSA data from ingame files read the PSA Editing Tutorial. This page will be concerned with the specifcs of the PSA binary format.

File Structure

The PSA file is structured as a collection if header-data pairs, of which there are four known types: Head, Bones, Info, Keys.

Schematic representation of a PSK file structure.

Psa file



Chunk Header

The chunk header contains information about its companion data chunk: id, type, size and count. There are four possible IDs, corresponding to each of the eight mesh objects:

  • ANIMHEAD: Does not contain a data pair.
  • BONENAMES: Array with the bone names.
  • ANIMINFO: Array of animation sequence info chunks.
  • ANIMKEYS: Array of raw keys.

The header is contained within a 32 byte struct:

Bytes Type Description
20 Char Chunk ID
4 Int32 Type Flag
4 Int32 Data Size
4 Int32 Data Count


Head

The head data chunk is defined by its header as having zero size and zero elements (count). Since it contains no information, it derives that only the header chunk has useful meaning. The header chunk may act as a file-header, but does not necessarily have to be the first chunk in the file.

Bones

The bones data chunk contains an array of bones. Each bone is defined as a 100 bytes struct.

Bytes Type Description
64 Char Bone name
4 Int32 Flags
4 Int32 Children
4 Int32 Parent index
4 Float Rotation X
4 Float Rotation Y
4 Float Rotation Z
4 Float Rotation W
4 Float Position X
4 Float Position Y
4 Float Position Z
16 4 * Int32 Padding


Info

Keys

ME3Explorer Classes

ME3Explorer > PSAViewer > PSAViewer.cs
ME3Explorer > Unreal > PSAFile.cs

References



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