Camera looks at an NPC, NPC triggers an animation problem

Help and Feedback Scripting Support
1

Hello! I’ve faced a problem recently with an idea of mine for a “jumpscare”.

What exactly do you want to achieve?
When a player’s camera (or when a player simply sees on their screen) sees an NPC, the NPC will trigger an animation, but it should not trigger when the NPC is behind a wall, more below.

What did you try to do to make it happen/fix issues?

  1. Camera:WorldToViewportPoint
    A problem with this is that when I have for an example…
local Vector2Position, isInView = camera:WorldToViewportPoint(monster.PrimaryPart.Position)

if isInView then
     -- npc is found, but...
end

it works, HOWEVER, I want to make it so it won’t trigger when the npc is behind a wall, as it triggers when I am looking in the direction of the NPC but there is a wall, massive object, or so. How can I avoid it?

I tried searching, but since I do not know how to properly formate the question I am asking, I was unable to find any results!

Thanks for any help! Cheers.

1 Like
2

You should use raycasting

2 Likes
3

You could use ray casting Raycasting | Roblox Creator Documentation, if the ray hits something then the character is behind the wall. (You might have to do a couple rays that are sort of the bound of the character)

1 Like
4

Thank you! I actually tried it, but weirdly it triggers it even if I check through raycasting, the code (raycasting part):

-- mons = monster model
for _,v in pairs(mons:GetChildren()) do
		pcall(function()
			local params = RaycastParams.new()
			params.FilterType = Enum.RaycastFilterType.Whitelist
			params.FilterDescendantsInstances = {player.Character}
			local ray = workspace:Raycast(cam.CFrame.LookVector,v.Position)
			if ray then
				print(ray.Instance)
				if mons:FindFirstChild(tostring(ray.Instance)) then
					-- woohoo we can now proceed ay
					canTriggerAction = true
					print("ay gotcha")
				elseif not mons:FindFirstChild(tostring(ray.Instance)) then
					print("behind an object most likely.")
					task.wait(.3)
					db = false
					return
				end
			end
		end)
		--if canTriggerAction then break end
	end

May I ask, where the issue could be at?

5

Thank you for your advice, please refer to my latest reply (excluding this one) for more information on my problem!

6

Try this one:

for _,v in pairs(mons:GetChildren()) do
		if v:IsA("BasePart") then
			local params = RaycastParams.new()
			params.FilterDescendantsInstances = {player.Character}
			local ray = workspace:Raycast(cam.CFrame.Position,(v.Position-cam.CFrame.Position).Unit*(v.Position-cam.CFrame.Position).magnitude,params)
			if ray then
				print(ray.Instance)
				if mons:FindFirstChild(tostring(ray.Instance)) then
					-- woohoo we can now proceed ay
					print("ay gotcha")
				elseif not mons:FindFirstChild(tostring(ray.Instance)) then
					print("behind an object most likely.")
					return
				end
			end
		end
	end

In the script, you forgot to add the RaycastParams in the ray and got the origin and the direction wrong.

2 Likes
7

Thank you! It got fixed, I owe you one. Have an amazing day. :slight_smile:

1 Like