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This is one of the game I most liked, which I occasionally play again with episodes 1 & 2.
I loved the atmoshpere (levels design, sounds) and the scenario. Alyx was also part of my interest in this game :)
Of course the 'Source engine' has got old with the years, but still does the job for this must-play game.

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***SPOILER*** - 3D Levels (Microsoft .X format) - split in 3 because of the size:

structures		textures (1/2)		textures (2/2)

3D items (Microsoft .X format) :

example: combine soldier

Bitmaps (textures, ...) : split in 2 because of the size:

part 1		part 2

Valve video  (H264-encoded .AVI) :

Audio :

• Sound effects, English voices (.WAV) - French voices (.WAV)
• Musics (.MP3)

Links

Technical info :

• For structures (BSP files) :

  Source Engine BSP File Format : a description of the structures' format, by Rof
  Source BSP File Format

  Displacement (terrains deformations)
  Tutorial: Displacements

  3D Skybox (structures rescaling / relocating)

• For items models (MDL files) :
  MDL Format (Models Data)
  VVD Format (Vertex Data)
  VTX Format (Mesh strips)
  VMT Format (Materials)
  
  
• For Bitmaps (VTF files) :
  VTF Format (Textures Format)
  
  

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