Why are viewport/world camera functions offsetting the actual position?

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1 
local camera = workspace.CurrentCamera
local position = Vector3.new(0, 1, 0)

local screenPos = camera:WorldToViewportPoint(position)
local ray = camera:ViewportPointToRay(screenPos.X, screenPos.Y)
ray = Ray.new(ray.Origin, ray.Direction * screenPos.Z)

local newPosition = ray.Origin + ray.Direction

assert(position == newPosition) -- fails

What am I doing wrong here?

1 Like
2

this is very slightly off, you should round them up a little

local function round(a, b, e)
    return (a - b).Magnitude < e or 1e-5 -- change for more precision
end
3

No, it is not. I wrote an assertion here just to demonstrate the problem. You can replace it with

print(position, newPosition) -- 0, 1, 0 0, 0.6572456359863281, -2.537040948867798

And values will be not just slightly off, they are two absolutely different positions.

4

then it fails because theyre not equal

5

Yes! That’s the problem! Why are they not equal?

6

after some testing it appears to me that i cant figure out why, sorry! :sad:

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7

That’s unfortunate. :frowning: Thank you for your time anyways!

8

Turns out that something is wrong with depth recognition:

print((ray.Origin - position).Magnitude, screenPos.Z)

I think that this is a bug in the engine.
UPD: I’ve submitted a bug report.