How do backpack's know how they should be rendered?

[Adrian Tut]

I've been trying to create a custom backpack, however I can't figure out where the details of how it should render are specified. 

I extracted \data\anim\swap_krampus_sack \data\anim\swap_backpack and \data\anim\swap_piggyback, and they all have different sizes. I couldn't find any atlas to specify which subtexture is what, but I'm assuming somewhere, someone is specifying all the subtextures. 

My assumption is that is specified in the build.bin file, however I wasn't able to make use of it. Tried converting it using krane, however it said: "ERROR: No animation found in the input files." and failed to export any scml project.

Any clue where to look into next?

 

Edit: I managed to figure out how to extract it based on : 
https://dontstarve.fandom.com/wiki/User_blog:MMueck/How_to_extract_animations_from_the_game 

"If you are missing the anim file, then this object/mob/etc. you're trying to extract may have other versions or states in a different zip file"

I still don't know what the frame animation are exactly, but I can kinda deduce from the context of the other backpacks.

Edited December 27, 2022 by Adrian Tut

[Rickzzs]

backpacks have 2 types of animations, ground animation is included in the backpack zip file itself, equip animation must be extracted together with any of a player_xxx zip file. If you want to see a wilson equipped with a backpack you can follow this method.

 

Edited December 28, 2022 by Rickzzs