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How can I randomly move my gameobject over my screen like dvd on pause

Discussion in '2D' started by SamVorst, Dec 17, 2019.

  1. SamVorst

    SamVorst

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    Hi,

    I want to make that my gameobject can move randomly like the dvd logo. Anybody know how to do this??

    Thanks Sam
     
    SamVorst, Dec 17, 2019
    #1

  2. Claoudy

    Claoudy

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    there you go, it's javascript but i think you can easily adapt it to unity
     
    Claoudy, Dec 18, 2019
    #2

  3. eses

    eses

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    @SamVorst

    What @Claoudy suggested probably works, but there is even easier way;

    Add rigidbody and collider to your object, and make a Physics2D material for it, set the material friction to 0 and bounciness to 1.

    Remove the gravity from your rigidbody, and in Start set its velocity to some direction.
     
    eses, Dec 18, 2019
    #3

  4. SamVorst

    SamVorst

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    Hi thanks, I'm coming far using this the only things i don't understand are: how to do velocity setting and how to prevent it not going to turn?
     
    SamVorst, Dec 18, 2019
    #4

  5. MelvMay

    MelvMay

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    You can set the velocity using Rigidbody2D.velocity in a script attached to the same GameObject. You can select the Rigidbody2D in the inspector and in the "Constraints" options check the freeze rotation constraint. You can find details on the Rigidbody2D here.
     
    MelvMay, Dec 18, 2019
    #5

  6. SamVorst

    SamVorst

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    All right, but I'm very new to coding so i don't know how to do to with only this ...
     
    SamVorst, Dec 18, 2019
    #6

  7. LiterallyJeff

    LiterallyJeff

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    Here's a tutorial about how to make an object with bouncy physics:

    Then as @MelvMay said, on the object's rigidbody component you can set the constraints to lock the Z rotation. You'll also want to set gravity scale to 0.

    Then you need a script to set the velocity when the game starts:
    Code (CSharp):
    1. public class InitialVelocity : MonoBehaviour
    2. {
    3.     // X and Y velocity set in the inspector
    4.     public Vector2 initialVelocity;
    5.  
    6.     private void Start()
    7.     {
    8.         // set the rigidbody velocity
    9.         GetComponent<Rigidbody2D>().velocity = initialVelocity;
    10.     }
    11. }
     
    LiterallyJeff, Dec 19, 2019
    #7
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  8. SamVorst

    SamVorst

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    I did and the result is that it don't move...
     
    SamVorst, Dec 19, 2019
    #8

  9. MelvMay

    MelvMay

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    Did you set the initialVelocity in the inspector to something other than the default of (0,0)?
     
    MelvMay, Dec 19, 2019
    #9

  10. SamVorst

    SamVorst

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    I don't know this is how it looks now
    upload_2019-12-19_10-18-28.png
     
    SamVorst, Dec 19, 2019
    #10

  11. MelvMay

    MelvMay

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    I suggest you start with some of the basic scripting and editor tutorials to be honest as that'll help you enormously.

    Any public field in a script will automatically show in the inspector. Your "Velocity" script doesn't seem to be showing a public Velocity field as the example does so you've either not added it or you've not made it public. Please just use the example above or copy it exactly. Then you can set the initial velocity.
     
    MelvMay, Dec 19, 2019
    #11

  12. SamVorst

    SamVorst

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    I used the code above but it doesn't work...
     
    SamVorst, Dec 19, 2019
    #12

  13. SamVorst

    SamVorst

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    @MelvMay I copied the code and I still could not to get it work.
     
    SamVorst, Dec 19, 2019
    #13

  14. MelvMay

    MelvMay

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    Just saying you couldn't get it to work doesn't help me help you. You could at least say which part didn't work as we were talking about you setting the velocity in the inspector so you could tell me if you managed to do that or not.

    Maybe post the Velocity script. I know you didn't use the exact code above because your component is named differently so maybe you missed something else? If you did manage to set the velocity in the inspector then I'm interested in how you assign that to the Rigidbody2D.

    Basically help me help you by me not having to guess what's not working and what you've already done.
     
    MelvMay, Dec 19, 2019
    #14

  15. SamVorst

    SamVorst

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    I can't still change the velocity.
     
    SamVorst, Dec 19, 2019
    #15

  16. MelvMay

    MelvMay

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    Sorry but you need to ellaborate. Why can't you change the velocity? Please post the script and the inspector for that script.
     
    MelvMay, Dec 19, 2019
    #16

  17. SamVorst

    SamVorst

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    Code (CSharp):
    1. using System.Collections;
    2. using System.Collections.Generic;
    3. using UnityEngine;
    4.  
    5. public class Velocity : MonoBehaviour
    6. {
    7.     public class InitialVelocity : MonoBehaviour
    8.     {
    9.         // X and Y velocity set in the inspector
    10.         public Vector2 initialVelocity;
    11.  
    12.         private void Start()
    13.         {
    14.             // set the rigidbody velocity
    15.             GetComponent<Rigidbody2D>().velocity = initialVelocity;
    16.         }
    17.     }
    18.  
    19. }
    20.  
    upload_2019-12-19_16-41-22.png
     
    SamVorst, Dec 19, 2019
    #17

  18. MelvMay

    MelvMay

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    So the script you're using isn't the same at all. For some reason you're using the example script but you've placed it inside another MonoBehaviour script. Why are you doing that? Simply use the example shown above and then you'll find the Velocity proprety is shown in the inspector.
     
    MelvMay, Dec 19, 2019
    #18
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  19. MelvMay

    MelvMay

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    If you want the script called "Velocity" then use the following (it's no different than the original example though):

    Code (CSharp):
    1. using System.Collections;
    2. using System.Collections.Generic;
    3. using UnityEngine;
    4.  
    5. public class Velocity : MonoBehaviour
    6. {
    7.     // X and Y velocity set in the inspector
    8.     public Vector2 initialVelocity;
    9.  
    10.     private void Start()
    11.     {
    12.         // set the rigidbody velocity
    13.         GetComponent<Rigidbody2D>().velocity = initialVelocity;
    14.     }
    15. }
     
    MelvMay, Dec 19, 2019
    #19
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  20. SamVorst

    SamVorst

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    Wow, i'm so stupid i was forgotten to delete the monobehaviour. But I have one more question, If the button hits an collider he goes straigth downstairs how can i prevent that?
     
    SamVorst, Dec 19, 2019
    #20

  21. MelvMay

    MelvMay

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    So I guess it works now? It would be nice for you to confirm that before moving on.

    Anyway, sorry but I have no way of understanding what you mean here. I don't even know what is happening in your project nor what you mean by "downstairs". In the end, it sounds very much like you should follow some tutorials such as this one: https://learn.unity.com/tutorial/2d-physics

    This'll explain the basics including script callbacks for collisions/triggers and how to respond to them.
     
    MelvMay, Dec 19, 2019
    #21