Movement speed buffering and damage repair

Mod/Resources Fixed a bug that prevented buffs and movement speed from being damaged by correctly applying magic effects.

If you've ever created or used a spell, potion, enchantment, etc. that increases or damages movement speed, you may have noticed that it doesn't seem to have any effect. This is the most notable frost magic, it's supposed to cut movement speed in half for a few seconds, but it doesn't. It turns out that this is due to the mechanism by which magic effects change movement speed.

Movement speed really depends on two things. The first is a set of speed forms associated with different creatures and movement types, and the second is an actor value called a speed multiplier. When something happens, the game recalculates the speed of movement by taking the speed of the current movement and multiplying it by a speed multiplier. This is where the problem occurs.

When a magic effect changes movement speed, it actually changes the speed multiplier, which works on paper, but in practice the game doesn't recalculate movement speed when a magic effect is applied, nor when the speed multiplier changes, so spells/potions/what have you appear to be broken.

This mod provides a circular solution to the problem by attaching a script to all movement speed effects (with the goal of instantaneously changing the effect's inventory weight) and then reverting the changes at the beginning and end of the effect. Since changes to the inventory do force the game to recalculate movement speed, this effectively makes the game handle these effects correctly.

Feel free to use this script as a resource and include it in any mod you make, but I recommend linking back to this page in case the new version is newer than the one you are using.

————————————————————————————————————————————————————————

If you've ever created or used a spell, potion, enchantment, etc, that buffs or damages movement speed, you may have noticed that it doesn't seem to have any effect at all. This is most notable with frost magic, which is supposed to cut movement speed in half for a few seconds, but doesn't. It turns out that this is due to the mechanics by which magic effects alter movement speed.

Movement speed is actually determined by two things. First is a set of speed forms pertaining to both different creatures and types of locomotion, second is an actor value called the Speed Multiplier. When certain things occur, the game recalculates movement speed by taking the speed for the current locomotion and multiplying it by the speed multiplier. This is where the problem occurs.

When a magic effect alters movement speed, it is actually changing the speed multiplier, which works on paper, but in practice, the game does not recalculate movement speed when a magic effect is applied, nor when the speed multiplier is changed, so the spell/potion/what-have-you appears to be broken.

This mod provides a roundabout fix for the problem by attaching a script to all movement speed effects which changes the target of the effect's inventory weight for a split second, then reverts the change, both at the start and end of the effect. Since changes to the inventory do prompt the game to recalculate movement speed, this effectively makes the game process these effects properly.

Feel free to use this script as a resource and include it in any mods you make, but I would suggest linking back to this page in case a newer version than what you used has been released.