I’m pretty sure you need to use acos instead of asin.
Aside from that, what do you mean by “angle between two parts”. Do you mean, the angle facing that part? Or the angle between their rotations?
The LookVector is just a directional vector, its not the angle. Doing math.acos gets the angle of the vector.
you could try target.orientation.X - part.orientation.X sine than it will calculate the angle diffrence between the 2 parts if u want part to look at the target you could do part.Cframe = CFrame.new(part.CFrame , target.CFrame)
only thing i would change is id use the both part’s positions instead of CFrame.
Then instead of using toObjectSpace id just do (partPos - targetPos) .Unit.
ps. if you’re trying to find the angle from the part to the target (part as the origin) then the equation becomes (targetPos - partPos).Unit
pps. You dont need to use .Unit on lookvector/rightvector/upvector because they are already a unit vector
This is the formula:
local function getAngle(a : Vector3, b : Vector3)
return math.atan2(a:Cross(b).Magnitude, a:Dot(b))
end
Where a and b are the Vector3s of the respective parts.
by “the Vector3s” do you mean the positions?
Yes, I mean the part’s position.
Oh, well in that case, how would i convert that returned value into degrees?
math.deg(radians)
example
math.deg(math.pi) --> 180
while task.wait() do
local partA = target.CFrame
local partB = part.CFrame
local x = partA.Position.X
local x2 = partB.Position.X
local z = partA.Position.Z
local z2 = partB.Position.Z
print(math.deg(math.atan((x-x2) / (z-z2))))
end
maybe this could work?
target is the second part, [part] is the main part, i need to find the angle between [part] and target so i can usr motor on a hinge constraint, dont worry abt that for now tho. And I just started using cos, tan, sin, and their inverse functions not too long ago so im fairly new to the concept of trig in roblox studio.
I can try that when im home (first period just started), but what’s the difference between acos and asin, and why would acos work for this?(no argument, just curious)
then again as my last reply to this post, whats the diff between acos, asin, atan and how to know to use which one where?
For a triangle with an angle θ , the functions are calculated this way:
https://www.mathsisfun.com/algebra/sohcahtoa.html
| Sine: | soh… | s in( θ ) = o pposite / h ypotenuse |
|---|---|---|
| Cosine: | …cah… | c os( θ ) = a djacent / h ypotenuse |
| Tangent: | …toa | t an( θ ) = o pposite / a djacent |
basics im well aware of. My bad for being unclear on what i mean by that. What i meant is how to know which one to use in which situation?
You use the ones you have the information for.
You want to get an angle of a triange. So you need 2 sides of the triangle, any two sides you have the information for.
local angle = math.acos(-(Part2.Position - Part1.Position).Unit.Z)
If you want it relative to Part1’s rotation, use this instead.
local angle = math.acos(Part1.CFrame.LookVector:Dot((Part2.Position - Part1.Position).Unit))
dont mind my 1 brain cell
what the heck does :Dot do
Tbh, I don’t even know what its main use is. I just know that its used to get the angle between two vectors.
oh. alr, thanks buddy, really neded this