Help with math calculations

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#1

This is a continuation of my previous topic: Help with crack effect - cracks being created in the air - #7 by GolgiToad

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When I land, my cracks end up half way in the air. Here are my caluculations for the bottom of the player’s foot:

local leftLegCFrame = char[Left Leg].CFrame
local leftLegSize = char[Left Leg].Size

game.ReplicatedStorage.CreateCracks:FireServer(leftLegCFrame:ToWorldSpace(CFrame.new(1,-leftLegSize.Y/2,0)))

How can I calculate it accurately so it ends up at the bottom of the player’s foot?

#2

Calculate the offset from the HumanoidRootPart; the leg can rotate and therefore change its position while not changing how high off the ground the player is.