Hello, I posted a few days ago about a similar issue. But now I’ve scratched that and I’m using hinge constraints, however I’m having trouble finding the formula to calculate the angle required for the gun barrel to aim towards the target. See photos
Any help is appreciated
Angle between 2 Vector3s? Just use CFrame.lookAt and derive the angle from its orientation
Something like this? 
I’ve tried this and this while using math.deg() and no luck, sorry CFrames completely go over my head 
Try using :GetOrientation() on the CFrame to get its individual angles.
--example
local cf = CFrame.lookAt(...)
local x, y, z = cf:ToOrientation()
Also, another possible way of getting the angle between 2 vectors would be to take the dot product of the vectors, but that’s linear algebra 
Vector3s work with no effective difference to a 2-dimensional vector as far as the fundamental math goes.
To calculate this with math you would use dot product (which is essentially v1.mag*v2.mag*cos(angle between vectors). Fortunately Roblox has v1:Dot(v2) for this, which saves some trouble.
This would be the math required to get the angle between two vectors:
a = workspace.a
b = workspace.b
dot = a.Position:Dot(b.Position)
m_a = a.Position.Magnitude
m_b = b.Position.Magnitude
angle_between = math.deg(math.acos((dot)/(m_a*m_b)))
print(angle_between)
Probably because this is solving for the overall angular difference between two 3D vectors, and because magnitude cannot be negative in nature you have no actual direction, just the angle difference. This angle difference could never be > math.pi.
Here’s a better approach to get the actual angle:
a = workspace.a
b = workspace.b
axis1, axis2 = "X", "Y"
p_v = a.CFrame:PointToObjectSpace(b.Position)
angle = math.deg(math.atan2(p_v[axis2], p_v[axis1]))
Hey why don’t you just try my original solution that uses CFrame.lookAt
local p1 = workspace.a.Position
local p2 = workspace.b.Position
local angle = math.deg(CFrame.lookAt(p1, p2):ToOrientation())
print(angle)
Sorry didn’t see you post it, that works thanks
Thanks for helping aswell, SummerEquinox
I know your post is old, but it has helped me out with a problem I have been trying to solve for a week now. Thanks!