How would I tell if a player is behind another player?
Like to check if someone was in front of, or behind another person. Would it be something like this?
function isBehind(plr1,plr2) if plr1.Torso<plr2.Torso.CFrame.lookVector then return true end end
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1 answer
There's more or less two ways to do this, and they both actually amount to the same thing.
What you have is sort of what it will look like, except that you wrote is just made up and not actually based on any of the math.
Math approach:
To determine to what extent a point is in a given direction, we use the Dot Product.
The direction we want is one part's lookVector; the direction from one player to the other is the difference of their Positions:
-- using A and B as parts (the player torsos):
-- Check if B is in front of A
forward = A.CFrame.lookVector
displacement = B.Position - A.Position -- (direction)
amountForward = forward:Dot(displacement)
if amountForward > 0 then
-- Forward
else
-- Behind
end
Or, we can use the CFrame and its Object Space.
Object space refers to using some object as the origin (so (0,5,0) is 5 studs "up" where "up" is the top of a brick; (0,0,0) would be the position of the brick rather than the origin)
whereB = A.CFrame:pointToObjectSpace( B.Position )
if whereB.z > 0 then
-- Behind
else
-- In front
end
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