Should rigidbody2D.velocity affect gravity?

I'd expect this tiny script to allow a sprite character(or any sprite with a collider2d/rigidbody2d), to drop onto a platform and then move along it in x at 'speed'. But instead, it floats down at a diagonal angle til it hits the platform, then moves along it.. Does this sound like what should happen?

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class MoveForward : MonoBehaviour
5. {
6.     public float speed =5f;
7.  
8.  
9.     void FixedUpdate ()
10.     {
11.         rigidbody2D.velocity = new Vector2(speed,0);
12.     }
13. }
14.  

 

T

Hello, first check the FixedAngle in your rigidbody2D component, and set Interpolate to be Interpolate, then check if it works, if it doesnt, then try using this code:

Code (csharp):

1. public float YourSpeed;
2.  
3. void FixedUpdate()
4. {
5. //To move left use -YourSpeed to move right use +YourSpeed.
6.         transform.Translate(Vector2.right * YourSpeed* Time.deltaTime);
7. }[code]
8.  
9. I hope thats what you wanted!

 

Thanks for the input, I appreciate your time. What I was getting at was, I'd expect a sprite with rigidbody and gravity scale of 1 to fall. It doesn't. Instead, it descends slowly as it moves in the x direction at 'speed'. This seems wrong to me, was wondering if this was an issue with Physics2D.

 

Are you using an animations?

 

Nope. It's simple to test. drag any sprite into the scene add a collider2d and rigidbody2d. Add a platform under it(with collider2d), and apply the movement script above. That is not how I'd expect physics to respond. I'm basically wondering if this is a bug.

 

You're zeroing out any vertical velocity every frame, so it's impossible for the object to accelerate downwards.

 

That makes sense, thanks. This seems to work fine.

Code (CSharp):

1. rigidbody2D.velocity = new Vector2 (transform.localScale.x * speed, rigidbody2D.velocity.y);