Hi!
I need to read how fast a parts is rotating on a local axis as shown in the Image.
I how I made it clear what it is I want to read.
Are you rotating it with a force or some kind of CFrame rotation?
local lastCFrame = Obj.CFrame
game:GetService("RunService").Heartbeat:connect(function (dT)
local currentCFrame = Obj.CFrame
local axis, angle = (currentCFrame * lastCFrame:inverse()):ToAxisAngle()
--> Axis [Vec3] and Angle [Number] of the change in angle between this and the last frame => use as a measure of Angular Velocity
end)where Obj is your part
Could you please explain what the axis, angle variables do?
I take it back, you’re more likely to want this:
local Obj = game.Workspace.Part
local pitch, yaw, roll = Obj.CFrame:toEulerAnglesXYZ()
local States = {
eulers = {
pitch = pitch;
yaw = yaw;
roll = roll;
},
velocity = {
pitch = 0;
yaw = 0;
roll = 0;
}
}
game:GetService("RunService").Heartbeat:connect(function (dT)
local currentCFrame = Obj.CFrame
local pitch, yaw, roll = Obj.CFrame:toEulerAnglesXYZ()
States.velocity = {
pitch = (pitch - States.eulers.pitch)/dT;
yaw = (yaw - States.eulers.yaw)/dT;
roll = (roll - States.eulers.roll)/dT;
}
States.eulers = {pitch = pitch; yaw = yaw; roll = roll}
table.foreach(States.velocity, print)
end)If you’re using a Cylinder BasePart then look at States.velocity.pitch and you’ll get the AngularVelocity in the direction a cylinder would roll
When I print the yaw changes to a negative number halfway through a rotation.
Pretty sure there’s a rotation velocity property for parts.
Part.RotVelocity
sorry I miss read, I thought it said yaw instead of pitch
There’s Rot Velocity but its relative to the world, I need to now the angular momentum relative to the object
I’m hoping that means it’s woking now?
Now it prints out 0 except every half rotation, where it prints out ~200. The motor which the object is attached to is set to 1.
Oh this is on an unanchored part e.g. a wheel? Just do this if you want object space:
local Obj = game.Workspace.Part
game:GetService("RunService").Heartbeat:connect(function (dT)
local AngularVel = Obj.CFrame:VectorToObjectSpace(Obj.RotVelocity)
print("in obj space:", AngularVel)
end)
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It works now, thank you so much for the help 
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No worries, glad the solution helped 