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Attempting to make an angled raycast but not working as intended?

Asked by

6 years ago

Basically, I'm trying to send three raycasts out from the character, each at a different angle. As you can see in this picture, one ray is supposed to go straight out which I can do with ease, but the outside rays are supposed to be angled and sometimes turn out wrong. You can see what I mean by turn out wrong in this gif. The third and fourth times the beams appear is what it's intended to look like, and all the other times are errors.

This is my code

01function rotatedVector (vector , theta)
02    local x = vector.X * math.cos(theta) - vector.Z * math.sin(theta)
03    local z = vector.X * math.sin(theta) + vector.Z * math.cos(theta)
04    return Vector3.new(x , vector.Y , z)
05end
06 
07for i = 1,3 do
08    local theta = math.rad(30) --angle in radians
09    local lookVector1 = char.HumanoidRootPart.CFrame.lookVector * 5
10    local lookVector2 = rotatedVector(lookVector1 , theta)
11    local lookVector3 = rotatedVector(lookVector1 , -theta)
12 
13    local rayEnd
14    if i == 1 then
15        rayEnd = lookVector1
16    elseif i == 2 then
17        rayEnd = lookVector2
18    elseif i == 3 then
19        rayEnd = lookVector3
20    end
21    local ray = Ray.new(char.HumanoidRootPart.Position, rayEnd) -- I've also tried using "char.HumanoidRootPart.CFrame.Position" but as expected nothing changes
22    local part, position = workspace:FindPartOnRay(ray, char, false, true)
23 
24    local beam = Instance.new("Part", workspace)
25    beam.BrickColor = BrickColor.new("Bright red")
26    beam.FormFactor = "Custom"
27    beam.Material = "Neon"
28    beam.Transparency = 0
29    beam.Anchored = true
30    beam.Locked = true
31    beam.CanCollide = false
32 
33    local distance = maxDistance
34    beam.Size = Vector3.new(0.3, 0.3, distance)
35    beam.CFrame = CFrame.new(char.HumanoidRootPart.CFrame.p, position) * CFrame.new(0, 0, -distance / 2)
36    game:GetService("Debris"):AddItem(beam, 1)
37end
 View all 37 lines...

Any help would be appreciated.

Can you try removing the scalar of 5 that's multiplied with the look vector of the humanoid root part? RayCurse 1518 — 6y

I removed it and tried messing around with it but the results were the same. Draebrewop 114 — 6y

It works when you're standing still right? Gif makes it look like it's a Root Position issue. xPolarium 1388 — 6y

When the character turns I mean. xPolarium 1388 — 6y

View all comments (3 more)

It works occasionally when standing still, but seems to work the same as when walking. I've noticed that it depends on where the character is facing. For example, if I cast the rays at one point without ever moving, and then I cast the rays, the result will be the same as the previous cast. Draebrewop 114 — 6y

5 upvotes holy jesus User#19524 175 — 6y

Sorry Draebrewop 114 — 6y

1 answer

Answered by

RayCurse 1518

6 years ago

Edited 6 years ago

The probelem I've identified that's most likely causing the issue is the lookAt parameter you are using to construct the CFrame for your beams. You are using the position of the humanoid root part and the position of the ray intersection which is the wrong way to do this. You should be using the lookVector instead of the ray intersection point. The positioning of the part should now look something like this:

1local pos = char.HumanoidRootPart.CFrame.Position
2local lookAt = char.HumanoidRootPart.Position + rayEnd
3local offset = CFrame.new(0, 0, -distance / 2)
4beam.CFrame = CFrame.new(pos , lookAt) * offset

I've tested specifically using the code you posted in your question and I encountered the same issue. Upon implementing the fix, the problems went away.

You're right. Works perfectly. Thanks a lot! Draebrewop 114 — 6y

No problem RayCurse 1518 — 6y

Attempting to make an angled raycast but not working as intended?

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