[2.1.12] quality_min/change have misleading tooltips when used in combination
Posted: Mon Jul 27, 2026 3:59 pm
When you assign either of these properties on a recipe product, viewing the tooltips in Factoriopedia suggests that quality_min is applied both before and after the quality_change step.
Reproduction mod with the following contents in data-updates.lua:
Using this example mod along with the Quality mod, when the Iron gear wheel recipe is set to Normal mode, I expect it to output Rare gears (if it is unlocked), because quality_min would clamp it to Uncommon before quality_change steps up to Rare.
What actually happens is that it always outputs Uncommon gears (with or without the Uncommon quality unlocked):
Based on my understanding from the ItemProductPrototype docs and my own testing, quality_change always runs completely before any quality_min/max clamping.
I also shared this Lua algorithm on another thread, of how I think Quality adjustment currently works in the game.
Either the two tooltips (from the first two images) are misleading, or the adjustment implementation is incorrect.
- quality-change.png (102.13 KiB) Viewed 249 times
- quality-min.png (53.98 KiB) Viewed 249 times
Code: Select all
local gear = data.raw.recipe["iron-gear-wheel"]
gear.results[1].quality_min = "uncommon"
gear.results[1].quality_change = 1
gear.can_set_quality = true
What actually happens is that it always outputs Uncommon gears (with or without the Uncommon quality unlocked):
- iron-gear-tooltip.png (42.96 KiB) Viewed 249 times
- iron-gear-crafting.png (14.55 KiB) Viewed 249 times
I also shared this Lua algorithm on another thread, of how I think Quality adjustment currently works in the game.
Either the two tooltips (from the first two images) are misleading, or the adjustment implementation is incorrect.