Just found this: viewtopic.php?t=58377 (idea of turret idle animation).

Thank you for taking the time to explain this mechanic. After taking a look at the actual sprites, it is indeed clear that idle animations can be used like you described. Then I propose a simple addition to provide the mechanic I had in mind: a property animation_speed_when_idle that is set to 0 by ...

For my mod https://mods.factorio.com/mod/better-air-filtering I could use a callback for when the recipe of a crafting machine changes. Specifically for detecting when fluid that is in the machine will be destroyed. The added machines contain a representation of pollution in liquid form, and need to...

Crafting machine prototypes have an idle animation (https://wiki.factorio.com/Prototype/CraftingMachine#idle_animation). As I understand it, this animation should be used when the machine is in an idle state. However it appears the "animation" is only rendered, but not animated as one woul...