Making Raycast Alternative Position Accurate

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#1

Hello so Im currently having an issue on making a solution for when a raycast returns nil and still get the position Ive followed this Topic it works but the part where the raycast is nil the position is not accurate

Video Demonstration

    local Caster = self.Caster 
	local CasterChar = Caster.Character
	
	local Direction = (MousePos - CasterChar.RightHand.Position).Unit * 30
	local Origin = CasterChar.RightHand.Position
	
	local Rayresult = workspace:Raycast(Origin,Direction,self.Params)
	local FinalPos 
	
	if Rayresult then
		FinalPos = Rayresult.Position
	else
		FinalPos = Origin + Direction
	end
	
	local Part = Instance.new("Part")
	Part.Parent = workspace
	Part.Position = FinalPos
	Part.CanQuery = false
	Part.CanCollide = false
	Part.Anchored = true

Ill appreciate any help!

#2

It seems you used my topic to make the cast. I was wondering what did you use to get the mouse position?

#3

The code looks correct to me, so can you explain what you mean when you say the position is “not correct”? What exactly do you want it to do?

#4

hello im a bit late but the part that get spawned in is not accurate to where the mouse cursor is hovering

#5

Mouse.Hit.Position is what I use to get the mouse position

#6

This is because of angles and mouse raycast. The mouse casts a ray thousands of studs away. If it did not hit anything, it would just return its final position.

image
image1602Ă—271 12.9 KB

As you can see, the Mouse ray extends far far away, and the workspace:Raycast tries to follow the mouse.Position.

If you limit the Mouse ray:

image
image1602Ă—261 13.6 KB

In this example, I limit the Mouse ray to 100 studs, thus the mouse.Position is shorter. When the workspace:Raycast followed it, it looks more real.

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#7

Did not mean to rhyme it, but anyways.

The solution is to make a custom Mouse ray. The advantages of using a custom Mouse ray is you can use RaycastParams, have custom results and isn’t thousands of studs away.

This is an example, you can change it however you want:

local char = plr.Character or plr.CharacterAdded:Wait()
local cam = workspace.CurrentCamera

local MAX_DISTANCE = 256 -- Max distance; You can change this
local params = RaycastParams.new()
params.FilterDescendantsInstances = {char} -- Add other stuff to ignore
local function MouseRay()
	local Ray = cam:ScreenPointToRay(mouse.X,mouse.Y)
	local origin, dir = Ray.Origin, Ray.Direction * MAX_DISTANCE
	local result = workspace:Raycast(origin, dir, params)
	if result then
		return {
			Hit = CFrame.lookAt(result.Position,result.Position+result.Normal),
			Target = result.Instance,
			Distance = result.Distance
		}
	else
		local hit = origin+dir
		return {
			Hit = CFrame.lookAt(hit, hit+dir),
			Target = nil,
			Distance = MAX_DISTANCE
		}
	end
end
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