✓ ANSWER ACCEPTED

How do I make bullet damage fall off?

Asked Dec 21, 2018989 views2 answers

So I have a variable called MinDamage and it's equal to 2. I have another variable called MaxDamage wich is equal to 6. And I have another variable for the maximum fall off distance wich is set to 90. How woul I make it so that the damage is ranged based? So if were to shoot in between the maximum fall off distance, the damage would be 2 - 6, and if I'm farther than 90 studs it would just set the damage to 6?

AnonymousDec 21, 2018

2 answers

✓ Accepted answer

So you could do this as a percentage.

We know that our total change in damage is up to 4, but for efficiency lets do this: local BulletMaxDelta = MaxDamage-MinDamage

So we know that from 0 studs away we should be doing maximum damage (at least I assume that's what you mean.)

Given that we can get the range, I'll let you handle the specifics but for now I'll simply call it a variable range

our 90 studs would be 0% bullet delta based on minimum damage and 100% bullet delta based on maximum damage.

So for simplicity we'll create new variable which is anything less than 90.

local AdjustedRange
if range > MaxFalloff then
	AdjustedRange = MaxFalloff
else
	AdjustedRange = range
end

Since we know the adjusted range is now accurate we can say local PercentDelta = AdjustedRange/MaxFalloff

Knowing this we can make our damage adjustment:

local DamageAdjustment = PercentDelta*BulletMaxDelta

And since I built this relative to max damage our final change is to subtract this from the full damage.

local FinalDamage = MaxDamage-DamageAdjustment

AnonymousDec 21, 2018Permalink

If we subtract one Vector3 from another, and then get .magnitude, we find the distance between two points. From there it's just a bit of maths to get what we want.

Note that this means you'll have to somehow keep track of the start position of a projectile if you're using projectile based weapons.

--[[
Calculates falloff damage based on the start and end positions
startPosition: Vector3 -> Where the weapon was fired from
endPosition: Vector3 -> Where the weapon hit its target
minimumDamage: Numeric -> The minimum damage the weapon will do
maximumDamage: Numeric -> The maximum damage the weapon will do
minimumFalloffDistance: Numeric -> The distance before we start applying
    falloff. Hits shorter than this distance will always do maximum damage
maximumFalloffDistance: Numeric -> The distance before we stop applying falloff.
    Hits further than this distance will always do minimum damage
]]
function calculateFalloffDamage(
        startPosition,
        endPosition,
        minimumDamage,
        maximumDamage,
        minimumFalloffDistance,
        maximumFalloffDistance)
    local distance = (endPosition - startPosition).magnitude
    
    if distance < minimumFalloffDistance then
        return maximumDamage
    elseif distance > maximumFalloffDistance then
        return maximumDamage
    else
        local falloffRange = maximumFalloffDistance - minimumFalloffDistance
        local percentage = (distance - minimumFalloffDistance) / falloffRange
        return maximumDamage * percentage
    end
end

AnonymousDec 21, 2018Permalink

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