Ultima 9 Anim.flx file format
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  Revision 1.00 7th Jan 2002
  Revision 1.01 11th Jan 2006 By Martin Hultén Ashauer

The anim.flx file contains the animation data for the game. Each entry in the FLX file contains one animation :

Offset      Size        Description
 0           DWORD       Index number of animation in the FLX file
 4           DWORD       ??
 8           DWORD       ??
 C           DWORD       Global Frames in animation
 10          DWORD       Start of header chunk?? (Always 0x1e)
 14          DWORD       Header identifier?? (Always 0x21)
 18          DWORD       Length of animation's filename => flen
 1C          flen        Animation's filename and path
 *           DWORD       Lenght of Header data => dl
 *           dl*4        Header data of some sort relating to the id's of the parts.
 *           DWORD       End of header chunk?? (Always 0x1a)

Now follows the different parts of the model. They have a very similar structure to the header chunk.

The parts:
Size        Description
 DWORD       ID (always realted to the chunk name) 
 DWORD       Chunk name length => l
 l           Chunk name
 DWORD       Local Frames in animation => f
 f*44        Animation Data

Animation data:
Size        Description
 DWORD       ID nr of frame?
 FLOAT*10    Unknown what exactly there control. Perhaps X,Y,Z,RotX,RotY,RotZ + some other vals. 

Written by John Larcombe aka TumbleWeed Dragon
tumble_weed@hotmail.com
http://www.iinet.net.au/~larcombe

Revised by Martin Hultén Ashauer aka Paeron
martin_AT_httpd_DOT_se
http://paeron.klippanlan.net