sprites levels
Hi all
The sprites levels changes base on if it is a basic, improved and advanced for fighters (not sure where jets fit in though). Tanks are this way too, light, medium, and heavy, plus super heavy.
About that thing you found in the tech files, I'm not sure what they do. However I bet that they are for the unit model, this is not the sprite, but the name of the model. Notice that in the models.csv file, they use the same numbers format for when to change the models name in game when the tech is researched.
Oh yeah, I use a 3d render to make my units, so perspective isn't much of a problem. I also use photoshop and photosuite as the 2d software.