You can export animated textures into Source from 3ds Max. Animated textures will change the image over time. You could, for example, make a texture that changes from a happy face to a sad face as the animation plays.

Wall Worm exports Bitmap textures that have a IFL (Image File List) as the source of the bitmap. An IFL is a text file that lists image files.

For an IFL to work, the filename of the IFL must match frame 0 of the IFL list. Morever, the IFL must contain sequentially numbered files.

3ds Max allows you to create IFL at render-time in with a checkbox near the File button in the Render Setup dialog. You can also create an IFL from a sequence of images when opening a sequence in Max's RAM Player.

Doing these steps will add a block of code into the VMT that looks like this:

"VertexLitGeneric"
{
 $basetexture "wallworm/videos/glowing_lava0"
 $bumpmap "wallworm/videos/lava_normal"
 Proxies
 {
   AnimatedTexture
  {
   animatedTextureVar $basetexture
   animatedTextureFrameNumVar $frame
   animatedTextureFrameRate 1
  }
 }
}

• In Max, the default time setting is 30 fps.
• You can control the exported frame rate in both the bitmap's Time control (it is a multiplier).
• For Animated Textures, WW Pro falls back to the standard VTEX.EXE to generate the VTF file.