[Answered] A mod twisting skyrim leg positioning

[LagrangeYu]

In Skyrim, when the actor's legs step on two different surface, the leg will adjust to the height. It becomes weird when NPC is on stair or some slope. I remember seeing a mod disabling this. Could anyone tell me its name?

[anubis]

FootIK Off Spell

[LagrangeYu]

Thank you, this is it.