Hello!
I am writing a simple billiards game. I want to detect if an element is moving or it just has stopped. Basically, I want to check if an element has kinematic energy. Is there any method in the engine for checking this?
I am asking because I see that collision shape is changing color in debug mode when my object stops moving.
Thank you 
Yeah - RigidBody->GetLinearVelocity is what I need probably 
Note that:
a) LinearVelocity is a Vector3, you can use its Length() as a velocimeter.
b) Alternatively could use RigidBody::IsActive() in your situation which will return true if either its linear or angular velocity are above their respective thresholds.
c) Welcome to the forums! 
Also note that if you don’t actually need the length but a metric to compare against, use Vector3::LengthSquared() to save a call to sqrt()
My game is just a simple learning project and I didn’t measure the performance of LengthSquared but comparing Vector to Vector::ZERO should not be much slower and maybe it is even faster 
I am rather new to cpp and it is not the time for optimization 
Anyway both solutions will work just fine