Question Momentum with rigidbody movement

Hi there. I was wondering how you add momentum to a basic rigidbody movement. Does anybody know?

 

Rigidbodies have momentum by default, as per newtonian laws of physics. Just make sure you're not doing something like:

• Overwriting the velocity directly each frame
• Moving via non-physical means like transform.Translate

 

I am using forces with my controller and it clamps the speed of the rigidbody. I just don't know how to implement it via code

 

Rigidbodies have a Drag value. Anything over 0 (and less than 1 -- it's the percent of speed lost) makes them slow down (which is like killing momentum?). But a starting rigidbody has a drag of 0. so Drag isn't your problem unless you changed it.

You're allowed to play with an object's speed directly.

transform.GetComponent<Rigidbody>().velocity

is what the Physics system uses. It's a simple Vector3. To give it a max speed of 8, for example, use this sneaky code. First ignore the math and just see that we can change the speed (on the last line):

Code (CSharp):

1. Rigidbody rb = transform.GetComponent<Rigidbody>();
2. float speed=rb.velocity.magnitude;
3. if(speed>8) {
4.   float scaleFactor=8.0f/speed; // note: will be less than 1
5.   rb.velocity*=scaleFactor;
6. }