I was able to do this by doing the following:
local p2 = script.Parent
local p1 = workspace.p1
game:GetService("RunService").Heartbeat:Connect(function()
local position = (p1.Position - p2.Position).Unit
local angle = math.atan2(-position.Z, position.X) - math.pi/2
p2.CFrame = CFrame.new(p2.Position) * CFrame.Angles(0, angle, 0)
end)
Just simple trigonometry. If you absolutely need dot product I could further investigate
Here’s a solution using dot product, although I don’t recommend
local p2 = script.Parent
local p1 = workspace.p1
game:GetService("RunService").Heartbeat:Connect(function()
local position = ((p1.Position - p2.Position) * Vector3.new(1, 0, 1)).Unit
local look = (p2.CFrame.LookVector * Vector3.new(1, 0, 1)).Unit
local result = position:Dot(look)
local dir = (position - p2.CFrame.RightVector).magnitude <= (position + p2.CFrame.RightVector).magnitude and -1 or 1
if result < 1 then
p2.CFrame *= CFrame.Angles(0,math.acos(result) * dir,0)
end
end)
Why wouldnt you recommend the dot product solution and also it works great but could you explain everything you changed in detail so I can grasp a better understanding of what i actually did wrong
Both solutions work, from what I’ve seen it seems simpler to use trig instead of making a more compliant dot product function.
Im asking how he actually got the dot product solution to work, unless you can expain
Why is he multiplying the vectors by this and then normalizing them?
Also I dont get what hes doing in this line exactly
local dir = (position - p2.CFrame.RightVector).magnitude <= (position + p2.CFrame.RightVector).magnitude and -1 or 1
I think by changing the way you calculate the dot itself, kojo multiplies it by a vector3 before calculating the unit vector, I’m not that great with dot product so it’s best that they explain it lool.
The second one calculates the direction to look at based on the differences of the right vectors, so it can tell which way to look?
Also why does he have a less then or equal to symbol in the direction variable is it an if?
What do you mean? It’s a one line if statement? I don’t understand
Yeah usually you dont have those symbols in variables so is he comparing?
Also why did he multiply by Vector3.new(1,0,1) specifically?
Yes, it compares the two rightvectors and the magnitude. It’s basically:
local WhatToPrint = ((1+1 == 2) and “it equals two”) or “it doesn’t equal two”
Because 1+1 is 2, what to print is set to “it equals two”
(Thats the logic behind one line if’s btw)
This one I’m not too sure on, maybe because of something to do with acos?
Hm, alright well thanks for the brief explanation of this, maybe if he responds something will be less foggy
No probs, I’m not great with math so I can’t really help much, anyways enjoy the rest of ur day!
I did this so that the vectors are on a X and Z plane (so its basically 2d vector). Since you’ll only be rotating around the Y axis I made it this way.
As you know, using dot product you could get the angle between. However it doesn’t tell you which direction (ex: dot product of 45° right vs 45° left is both 
). I used a hacky way of determining the direction by comparing which side vector is closest to point toward the target.
(vector A is closer to pointing towards the object than vector B; therefore it should turn right).
Ohhh alright thanks alot this makes alot of sense now
How would I change this so it would work on the Y Axis like moving the block up and it still looking at it but its Y Position
local p2 = script.Parent
local p1 = workspace.p1
game:GetService("RunService").Heartbeat:Connect(function()
local position = (p1.Position - p2.Position).Unit
local angle = math.atan2(-position.Z, position.X) - math.pi/2
local pitch = math.asin(position.Y)
p2.CFrame = CFrame.new(p2.Position) * CFrame.fromEulerAnglesYXZ(pitch, angle, 0)
end)
Wow that easy thanks a bunch man!