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From HalfLife 2 Knowledge Base

Creating animated sprites and textures by Cannonfodder

To create an animated sprite or texture you must first create a tga for each frame of the animation. Name these images image001.tga, image002.tga, image003.tga, etc, etc.

Now create a text file with the following format and name it the same as the images (e.g. for the above example use image.txt):

 "startframe" "1"
 "endframe" "3"

Run the vtex command just as if you where creating a single texture, but instead of putting the tga on the command line use the .txt file, e.g.

 vtex -mkdir -shader sprite materialsrc/mymaterials/image.txt

This will create a vmt and vtf file in materials/mymaterials

For a an animated sprite edit the vmt file to look like the following :

 "Sprite"
 {
 	"$spriteorientation" "parallel_upright"
 	"$spriteorigin" "[ 0.50 0.50 ]"
       "$basetexture" "mymaterials/image"
 }

NOTE: The frame rate and scale of the sprite are specified in the env_sprite entity

For an animated texture which can be used on walls or skyboxes you need a different vmt as follows

 "LightMappedGeneric"
 {
  "$baseTexture" "mymaterials/image"
  "Proxies" 
       { 
         "AnimatedTexture" 
         { 
            "animatedTextureVar" "$basetexture" 
            "animatedTextureFrameNumVar" "$frame" 
            "animatedTextureFrameRate" "2" 
         }
    } 
 }

If you are creating a texture for a model, then change the shader from LightMappedGeneric to VertexLitGeneric. For animated textures the framerate is specified in the vmt file (In the above example it is 2 frame/sec)

NOTE: Setting framerate of a spraypaint's vmt-file doesn't seem to work!

Cannonfodder