RigidBody 2D's showing incorrect values for velocity

Unity Engine
1

I am using rb.velocity in my scripts to make my character move.
So when I use the :-
rb.velocity = new Vector2(50, rb.velocity.y);

it causes my rigidbody2 inspector to show a y velocity of 7.167013E-06

7496627--923219--ss 1.png
7496627--923219--ss 1.png1842Ă—850 103 KB
7496627--923219--ss 1.png
7496627--923219--ss 1.png1842Ă—850 103 KB

1 Like
2

This seems consistent with floating point (im)precision. Gravity is pushing down on the rigidbody, the collider below is “stopping” it and the result is a very low number that should be 0 but it’s 0.000007167013.

3

Oh ok that kind of makes sense but another thing is that I have a ladder in my platformer(the white sprite shape that you see in the above screenshot). When my player is on it, it’s supposed to have a velocity of 0 if no key is pressed.
The Rigidbody2D shows the velocity to be 0, but my player keeps sliding down instead of having a y velocity 0.
These are 2 consecutive frames of my gameplay:-

7496963--923294--ss 2.png

7496963--923297--ss 3.png

This is the code used for climbing behaviour:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
public class Climb : MonoBehaviour
{
    public float climbSpeed;
    int climbDirection = 0;
    public Rigidbody2D rb;
    bool canClimb = false;
    // Start is called before the first frame update
    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
    }

    // Update is called once per frame
    void Update()
    {
        climbDirection += Convert.ToInt32(Input.GetKeyDown(KeyCode.UpArrow)) - Convert.ToInt32(Input.GetKeyUp(KeyCode.UpArrow)) - Convert.ToInt32(Input.GetKeyDown(KeyCode.DownArrow)) + Convert.ToInt32(Input.GetKeyUp(KeyCode.DownArrow));
        if (canClimb)
        {
          
           rb.velocity = new Vector2(rb.velocity.x, climbDirection * climbSpeed);
         
        }
        Debug.Log(canClimb);
    }

    private void OnTriggerEnter2D(Collider2D collision)
    {
        if(collision.gameObject.tag == "ladder")
        {
            canClimb = true;

        }
    }

    private void OnTriggerExit2D(Collider2D collision)
    {
        if (collision.gameObject.tag == "ladder")
        {
            canClimb = false;

        }
    }
}
4

You’ll need to debug it yourself, we don’t have the project but I see you using gravity so why would it not be that?

1 Like
5

I have literally tried everything I could but I can’t seem to find the reason of this happening.
I have disabled every other object in my scene except my player and main camera
disabled all of it’s scripts except transform, rigidbody2d, sprite renderer and this little script

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Test : MonoBehaviour
{
    Rigidbody2D rb;
  
    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
    }

  
    void Update()
    {
        rb.velocity = new Vector2(0, 0);
    }
}

The rigidbody 2d is showing a x and y velocity of 0 but my player is still falling down slowly
This is my rigidbody properties

7500635--924107--ss 4.png
7500635--924107--ss 4.png583Ă—923 57 KB

UPDATE: The problem stops from happening when I set the gravity scale to 0 and the rate of falling is directly proportional to gravity scale. Is there any way I can stop this from happening without setting my gravity scale to 0 as I want my player to be affected from gravity while not on the ladder

6

Set the scale to zero while he’s on the ladder, restore it to whatever nonzero value you want when he leaps off.