Most efficient way to register projectile hits?

Help and Feedback Scripting Support
#1

if i want to make a non-hitscan projectile and have it accurately register when it hits someone, what should i use

#2 
projectile.Touched:Connect(function(partWhichItHit)
    print("hit")
end)
#3

most big games (even outside of roblox) use a system that moves the projectile and detect collisions in the same ‘update tick’ (usually a RunService.Heartbeat) which will makes sure the projectile will not pass through a target without detecting it

sample code:

		local pos = starting point 
		
		projectile.Parent = workspace
		projectile.PrimaryPart.Anchored = true
		projectile.PrimaryPart.CanCollide = false
		local velocity = CFrame.new(pos, target position).lookVector * speed
		while true do
			local hb = game:GetService("RunService").Heartbeat:Wait()
			local nextpos = pos + (velocity * hb)
			projectile:SetPrimaryPartCFrame(CFrame.new(pos, nextpos))
			
			local ray = Ray.new(pos, nextpos - pos)
			local hit = workspace:FindPartOnRayWithIgnoreList(ray, ignore list)
			
			if hit then
				if hit.Parent and game.Players:GetPlayerFromCharacter(hit.Parent) then
					print("collided with a player character")
					projectile:Destroy()
					return
                else
                    print("collided with a non-character object")
                    projectile:Destroy()
                    return
				end
			else
				pos = nextpos
				--velocity -= Vector3.new(0,workspace.Gravity * hb,0) --//for a gravity-affected arc
4 Likes
#4

If you’re using a high speed projectile this is one method.
You’d want to make a loop that make a raycast to the position before and the position after.
It should look something like this.

local OldPos = PartSpecified.Position
game:GetService("RunService").RenderStepped:Connect(function()
	local NewPos = PartSpecified.Position
	local RayCast = Ray.new(OldPos, (NewPos - OldPos))
	local Part, Position = workspace:FindPartOnRayWithIgnoreList(RayCast, {IgnoredParts})
	if (Part) then
		--- This is the part that was in between the two render positions
	end
end)

You could also use this module called fastcast.

2 Likes