AtlasedTexture
From Spring
AtlasedTexture is an alias to a texture. This means the alias must be defined somewhere and pointing to to a real texture. For AtlasedTextures used in projectiles (like those spawned by explosiongenerator) they need to be defined in resources.lua under the [projectiletextures].
A line defining a texture alias in resources.lua looks like this:
alias = "real_image.tga",
Most spring suported image format can be used in AtlasedTextures, but not compressed dds.