How to create an Asteroids style moving in 2D mode?

Question

I'm working on an asteroids style game, and I can't figure out how to apply a forward velocity for the ship. So far I've done is a rotation but any form of forward thrust I can't do.

This is my code so far:

     public float speed = 10.0f;
     public float rotationSpeed = 10.0f;
     // Update is called once per frame
     void Update()
     {
         if (Input.GetKey(KeyCode.W))
         {
             //not working
             rigidbody2D.AddForce(Vector2.up * speed);
         }
         float rotate = Input.GetAxis("Horizontal") * rotationSpeed;
         transform.Rotate(0, 0, 0 - rotate);
     }

Answer 1

Best Answer

Answer by marsfan · Sep 05, 2014 at 03:18 PM

For a start, use rigidbody2d.addrelativeforce as shown here: docs.unity3d.com/ScriptReference/Rigidbody2D.AddRelativeForce.html This will add force along the local axis. This will make setting the direction of force easier.

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lepickle · Sep 06, 2014 at 08:12 AM 0

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There's a compiler error saying:

Error 8 'UnityEngine.Rigidbody2D' does not contain a definition for 'AddRelativeForce' and no extension method 'AddRelativeForce' accepting a first argument of type 'UnityEngine.Rigidbody2D' could be found (are you missing a using directive or an assembly reference?) C:\Users\$$anonymous$$ark\Documents\Unity Projects\Swingship\Assets\playerScript.cs 87 25 Assembly-CSharp-vs

I've also tried Rigidbody2D.AddRelativeForce (With capital R). But nothing comes up in the VS intellisense.

sevensixtytwo · Sep 06, 2014 at 10:47 AM 0

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How exactly did you call the AddRelativeForce? IIRC, it accepts a Vector2 plus the Force$$anonymous$$ode so it should look something like this:

 this.rigidbody2D.AddRelativeForce(Vector2(x,y),Force$$anonymous$$ode2D.Force);

Since it's relative it will add x force along the object's local x-axis and y force on the local y-axis.

lepickle · Sep 07, 2014 at 01:56 PM 0

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Sorry, for the late response. it seems that I have to use transform.up ins$$anonymous$$d of Vector2.up. Now the sprite is moving around. Thank you for answering, though. $$anonymous$$y new code is:

 rigidbody2D.AddForce(transform.up * Time.deltaTime * speed * Input.GetAxis("Vertical") * 0.5f);

Answer 2

Answer by Multeezee · Aug 22, 2019 at 08:09 PM

This helped me find this: https://docs.unity3d.com/ScriptReference/Rigidbody2D-drag.html which helped me slow down a RigidBody Underwater. Thank you!

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How to create an Asteroids style moving in 2D mode?

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