Water Slowdown Mechanics in Minecraft Forge 1.16.3

waterSlowdown.txt

water slowdown mechanics

assume an entity is in water

let moveSpeed = movement speed attribute
	defaults to 0.7 for players?
let swimSpeed = swim speed modifier attribute
	defaults to 1.0
let depthStriderEnchantment be 0F, 1F, 2F, or 3F (depends on enchantment tier, hard capped at 3) if on ground, or half that if treading water
let depthStriderFactor = depthStriderEnchantment / 3F (results in a number in the range [0,1])
let attenuation =
	entity has dolphin's grace? 0.96F, else
		let baseAttenuation = 0.9F if sprinting, otherwise check entity.getWaterSlowdown():
			0.98 for polar bears
			0.96 for skeleton horses
			0.80 for everything else
		let attenuation = baseAttenuation + (0.546F - baseAttenuation) * depthStriderFactor
		(this results in baseAttenuation with no depth strider, or 0.546 at max depth strider and on ground)

let unmodifiedWaterSpeed = (0.02F + (moveSpeed - waterSpeed) * depthStriderFactor)
	(this results in 0.02F if no depth strider, or moveSpeed at max depth strider and on ground)

let waterSpeed = unmodifiedWaterSpeed * swimSpeed

set velocity to waterSpeed in current forward vector
apply that velocity to position
multiply current motion vector by (attenuation, 0.8, attenuation)