How to detect when a fast objects touches something?

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1

Question:
How do I detect when a object moving at a fast speed touches something?

Problem:
Touch event dose not fire when a object is moving at high speeds

Context:
I am making a Anti air craft gun.

Things I have tried:
RayCasts, fast object using the touched event

Requirements/Reason

  • Bullet speed/ To make it harder to hit something far away
    -Bullet Drop/ This would be for heavier Anti air weapons
    -Bullet Visibility/ so players can correct their shots

Examples
-General Quarters(Has the anti air I am looking for)
- Naval Warfare(No bullet drop)

2

Instead of using the Touch event, you can try to use :GetPartsInPart()

workspace:GetPartsInPart(bullet,overlapParams)

They are more reliable than the touch event. I assuming you are using parts as your bullets since you want visuals and bullet drop (although I think this can be done with raycasts).

3

There are quite a few posts about this already.
I tried searching the forums for “how to detect fast objects” and there are a few posts about it.
Try also searching “touched event for projectiles”, “detecting bullet hits” or other similar search terms.

4 
--detect all objects with speed above 100
local threshold = 100

local parts = {}
local function partAdded(part: BasePart): () 
	if not part:IsA("BasePart") then return end
	--small optimization so we only check physically active parts
	if not part.Anchored then table.insert(parts, part) end 
	part:GetPropertyChangedSignal("Anchored"):Connect(function()
		if part.Anchored then
			table.remove(parts, table.find(parts, part))
		elseif not table.find(parts, part) then
			table.insert(parts, part)
		end
	end)
end

workspace.DescendantAdded:Connect(partAdded)
for _, descendant in pairs(workspace:GetDescendants()) do
	task.spawn(partAdded, descendant)
end

local function getFastObjects(threshold: number): {BasePart}
	local objects = {}
	for _, part in pairs(parts) do
		local speed = part.AssemblyLinearVelocity.Magnitude 
		if speed <= threshold then continue end
		table.insert(objects, part)
	end
	return objects 
end

game:GetService("RunService").Heartbeat:Connect(function()
	local fastObjects = getFastObjects(threshold)
	if #fastObjects == 0 then return end
	print(fastObjects)
end)
5

Sorry that’s not what I meant. I wanted to detect when a fast moving object touches something.