How to get the angles between two objects

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#1

I am trying to get a part’s relative angles to another one’s but I can’t seem to find the right way to do it

https://gyazo.com/02642348d41024db25fe55467219ae82

as in the image in the link, I want to get the individual rotations that i have to do on each axis to get to the first part’s orientation

I tried to get the angles individually by separating each of the 3 axis’ vectors as following:

local p1  		= Part1.CFrame.LookVector   
local p2		= Part1.CFrame:ToObjectSpace(Part2.CFrame).LookVector
local ZPart1	= Vector3.new(P1.X,P1.Y,0)
local ZPart2	= Vector3.new(p2.X,p2.Y,0)
local Zangle 	= math.acos((ZPart1:Dot(ZPart2))/ (ZPart1.Magnitude * ZPart2.Magnitude))

but Zangle is always 90 degrees for some reason

Thanks,
Tem

1 Like
#2

Check this post out from a few days ago.
It might help:

1 Like
#3

Sadly, it doesn’t work for my case.
But thank you for the suggestion

#4

Are you just trying to find the difference in terms of the ORIENTATION, or are you also accounting for the angle BETWEEN them (in world space)

#5

hmm, how do I explain this?

let’s say we have a part with it’s look vector like this: V3(0,0,-1)
Now, I rotate (yaw) it 90 deg to the right, so now it’s LookVector is like this V3(-1,0,0)
And now, I pitch it to 90 deg counterclockwise. Now the LookVector is V3(0,1,0)

If i run the function with arguments p1 and p2, where p1 is the part after the rotations {V3(0,1,0)} and p2 is the part before the rotations {V3(0,0,-1) } the output would be something like this: V3(90,-90,0)

#6

Are you trying to find the dot product between the two look vectors?

#7

As I was writing this reply I have realised that i can’t do it with only LookVector. I need all the three vectors, LookVector, UpVector and RightVector to get all the angles

#8

If you want to get the difference of the lookvector and can be used for UpVector ect…

local object1 = ??
local object2 = ??
local dotproduct = object1.CFrame.LookVector:Dot(object2.CFrame.LookVector)
local angle = math.deg(math.acos(dotproduct)) -- math.acos(dotproduct) if just in radians
#9

that way you get the angle between the 2 vectors, not how, in local space, you have to rotate the second object to get the first one’s orientation