Fastcast cosmetic bullet not following ray visualization

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#1

I am using fastcast to simulate bullets with a gun. However, the cosmetic bullets I have created do not follow the ray visualization(the black lines). I am a fastcast noob so i don’t know what I am doing

fastcast code:

local weapon = char:FindFirstChildOfClass("Tool")
	local origin
	
	if not weapon then return end
	
	if (localplayer.Character.Head.CFrame.p - camera.CFrame.p).Magnitude < 1 then
		origin = camera.Viewmodel:FindFirstChildOfClass("Tool").Model.Shoot.Position
		
	else
		origin = weapon.Model.Shoot.Position
	end
	
	local tool = char:FindFirstChildOfClass("Tool")
	local itemstats = require(tool.Itemstats)
	
	local mousecastparams = RaycastParams.new()
	mousecastparams.IgnoreWater = true
	mousecastparams.FilterType = Enum.RaycastFilterType.Exclude
	mousecastparams.FilterDescendantsInstances = {camera.Viewmodel, localplayer.Character}

	local direction = (GetMouse(itemstats.weaponstats.range, mousecastparams) - origin).Unit

	local castbehavior = fastcast.newBehavior()
	castbehavior.Acceleration = replicatedstorage.bulletGravity.Value
	castbehavior.RaycastParams = params
	castbehavior.AutoIgnoreContainer = false
	castbehavior.CosmeticBulletContainer = workspace.CosmeticBulletsContainer
	castbehavior.CosmeticBulletTemplate = replicatedstorage.GameItems.Bullet
	
	caster:Fire(origin, direction, itemstats.weaponstats.velocity, castbehavior)
	
	caster.RayHit:Connect(function(hit)
		print(hit.Instance)
	end)

you can see in the video how the console prints nil for hit.instance

#2

caster.RayHit should be connected only one time at the beginning of the script

also you need to update the cosmetic bullet yourself

edit: this one should also be connected just one time at the beginning of the script

caster.LengthChanged:Connect(function(cast, segmentOrigin, segmentDirection, length, segmentVelocity, cosmeticBulletObject)

	if cosmeticBulletObject == nil then return end

	local bulletLength = cosmeticBulletObject.Size.Z / 2 
	local baseCFrame = CFrame.new(segmentOrigin, segmentOrigin + segmentDirection)
	cosmeticBulletObject.CFrame = baseCFrame * CFrame.new(0, 0, -(length - bulletLength))

end)
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#3

This was just for testing purposes to see what it was hitting

This is done with the lengthchanged, correct? I am mostly using a version of this script i created a while ago and can use that function instead of the one you provided

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#4

yes it calls lengthchanged when the bullet moves

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