How can i get a constant speed with a Vector3Curve

Help and Feedback Scripting Support
#1
  1. What do you want to achieve? Keep it simple and clear!

Im trying to make the Yellow Sphere go from the GreenBlock to the BlueBlock at a constant speed (The MidPoint is from the script)

  1. What is the issue? Include screenshots / videos if possible!

The issue is that when it gets close to a Block (Green, Blue, Mid) it gets really slow which you can see through the white points i generated below

image

  1. What solutions have you tried so far? Did you look for solutions on the Developer Hub?

Yes, i have looked for solutions before and i have actually fixed it before but it was for
quadratic bezier curves and the solution for that was to uniform the points so it will go at a constant speed but the problem was that it costed a lot of resources to actually make it go at a constant speed

#2

Could it be the easing mode you’re using? Also please show us the code

#3

Hi, no its not the easing mode the problem is that the curve is not uniformed

The Module

function FloatCurves.new(Positions, Speed)
    
    local self = setmetatable({}, FloatCurves)
    
    
    --// Validation
    
    if not Positions or typeof(Positions) ~= "table" then
        return
    end
    
    if not Speed or typeof(Speed) ~= "number" then
        Speed = 1
    end
    
    
    --// Setup
    
    self.Curve = Instance.new("Vector3Curve")
    self.TotalTime = 0
    
    local CurveX, CurveY, CurveZ = self.Curve:X(), self.Curve:Y(), self.Curve:Z()
    
    for i,v in pairs(Positions) do
        
        --// Since the index always starts at 1 we going to check if its bigger than 1
        
        if i > 1 then
            
            --// If it is then we are going to use the magnitude and add it to the curve time to get a more consistent curve speed
            
            local TimeToAdd = (v - Positions[i - 1]).Magnitude / Speed
            self.TotalTime += TimeToAdd
            
        end
        
        CurveX:InsertKey(FloatCurveKey.new(self.TotalTime, v.X))
        CurveY:InsertKey(FloatCurveKey.new(self.TotalTime, v.Y))
        CurveZ:InsertKey(FloatCurveKey.new(self.TotalTime, v.Z))

    end
    
    
    return self
end


function FloatCurves.PositionFromTime(self, CurveTime)
    
    if not CurveTime then
        return
    end
    
    return Vector3.new(table.unpack(self.Curve:GetValueAtTime(CurveTime)))
end


function FloatCurves.Tween(self, CurveTime, EasingStyle, EasingDirection)
    
    local Alpha = CurveTime / self.TotalTime
    local CurveTween = TweenService:GetValue(Alpha, EasingStyle, EasingDirection)
    local ActualCurveTime = CurveTween * self.TotalTime
    
    return self:PositionFromTime(ActualCurveTime)
end

LocalScript

local Positions = {
    Start.Position,
    Middle,
    Enemy.Position
}

local Curve = MilkClient.Classes.FloatCurves.new(Positions, 1)



---- Functions ----


local function RenderProjectile(Delta)
    local ServerTime = Workspace:GetServerTimeNow()
    local CurveTime = (ServerTime) % Curve.TotalTime
    
    
    Projectile.Position = Curve:PositionFromTime(CurveTime)
    
    
end


RunService:BindToRenderStep("ProjectileRender", Enum.RenderPriority.Last.Value, RenderProjectile)
#4

(Assuming you’re currently using bezier curves)

How I would do it is you would get the current bezier point, then get the next bezier point and find their distance, then divide that by how fast you want the projectile to go (This will be your speed). After, tween the projectile to move to the next bezier point with the fixed speed.

Hope this helps

#5

yes i know about that “LUT” stuff but im using a Vector3Curve which is a some sort of “Instance” that does curves which im not sure how i will evenly distribute it

#6

Well I’m not sure, never used Vector3Curve’s before, I’ll do some digging then come back later

1 Like
#7

I’m not sure how you’ll distribute equally using Vector3Curve’s, think you’re better off using bezier curves

#8

ok thanks for your help (charsssss)

1 Like