Touches aren't detecting

[coolalex1835 (Waltuh)]

i’ve got a custom touch velocity function here:

local registered = {}
local newTouch = {}

local function getSize(v1:Vector3, v2:Vector3, psize:Vector3)
	return
		Vector3.new(
			psize.X,
			psize.Y,
			math.abs(v1.Z-v2.Z)
		)
end

newTouch.atVelocity = function(p:BasePart, func:(BasePart, RBXScriptConnection)->())
	local olp = OverlapParams.new()
	olp.FilterType = Enum.RaycastFilterType.Exclude
	olp.FilterDescendantsInstances = {p}
	local atRun : RBXScriptConnection
	atRun = game["Run Service"].Heartbeat:Connect(function(dt)
		if p.Parent == nil then atRun:Disconnect() end
		local velocity = p.AssemblyLinearVelocity
		local average = (p.Position + velocity * dt)/2
		local cf = CFrame.lookAt(average, average + velocity)
		local size = getSize(p.Position, p.Position + velocity * dt, p.Size)
		
		local inbox = workspace:GetPartBoundsInBox(cf, size, olp)
		for _, basepart in pairs(inbox) do
			if basepart == p then return end
			func(basepart, atRun)
		end
	end)
	return
		{
			disconnect = function()
				atRun:Disconnect()
			end,
		}
end
return newTouch

This is specifically for a cannonball, which is too fast for generic .Touch to work, and is too big for raycasts to detect most collisions, I do use raycasts alongside it but it is not suffiecent.

My custom function is still not detecting collisions, and I have no idea why.

[MooMooManager (Ferrous)]

Not a solution, but maybe Spherecasting would be useful here?