How do I cast a ray from an object to the camera?

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#1

I am trying to cast a ray from an object to the main camera.

Like this:

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I tried

Vector3.fromAxis(math.rad(math.acos(Part.Position:Dot(workspace.CurrentCamera.CFrame.Position)/(Part.Position.Magnitude * workspace.CurrentCamera.CFrame.Position.Magnitude))))

But it doesn’t rotate towards the camera.

I am not good with Vectors and CFrames, so I probably am doing something wrong.

Yep, definitely doing something wrong. When I printed it out it just output 1, 0, 0.

This is probably a very easy fix but I am still confused :confused:

#2

so the way we construct vectors from 2 points is we do this neat thing

vector = tail - head

In code this would be something like

local rayVector = (part.Position - workspace.CurrentCamera.CFrame.Position) * 4999
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#4

Didn’t work correctly. When I tried this happened (I am setting the orientation of the red part for now)

Part is the blue one, the camera is where the image position is

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#5

You’re probably not positioning/rotating it correctly. Therefore, it looks wrong.

#6

What should I do? I am currently doing this:

workspace.Rotator.Orientation = (Part.Position - workspace.CurrentCamera.CFrame.Position)

(Rotator is just that red visual part)

#7

try:

workspace.Rotator.CFrame = CFrame.new((Part.Position + workspace.Rotator.Position)/2, camera.CFrame.Position)
#8

I am try to make the ray face to my camera from the part. That is not going to work (I think) since it is a ray and it needs a Vector3. The only reason I have that red part is so that I can see where the ray is actually facing.

Thanks though!

#9

It does work, what I’m doing rn is positioning the rotator part between the two positions and making it face your camera. Which demonstrates how the ray is positioned and rotated.

#10

It says in the API reference that direction in Raycast must be a Vector3. I tried it but it didn’t work.

image

#11

this is for positioning your rotator part, not for shooting your ray. If you want it to shoot to your camera use @CoderHusk’s Direction

#12

I tried that but it wouldn’t work last time, maybe I will try again

#13 
workspace:Raycast(part.Position, (cam.CFrame.Position - Part.Position), rayParams)
#14

If you want the rotator part to be orientated to where the ray is shooting then set the cframe to what I sent previously.

#15

No, I only have that red part so I can see where it is actually shooting for now. I will delete it after, I just need it to see if it moves correctly.

#16

It does the same thing if I do that.

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#17

The way you set position & rotation of a part is not the same as the way you do it for a ray.

#18

That is what I am trying to say, I need Vector3s not CFrames.

I tried @CoderHusk’s and your code but it just does this:

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#19

Rotator.CFrame = CFrame.new(Part.Position, Camera.CFrame.Position)
I have to go just use the code I sent above it should work.

#20

No it’s not that, When you create a ray you use a position and a direction, while a part needs a ROTATION, rotations are not the same as directions.

#21

So this would be the code when making the ray?

local FilterRay = workspace:Raycast(
	Part.Position,
	(workspace.CurrentCamera.CFrame.Position - Part.Position),
	RayParams
)
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