Jumping using rigidbody.velocity question.

Hello there.

have a few question here, I'm trying to do a jumping script for my character using a rigidbody. for the jumping part I manage to do it, below is the script :

Code (csharp):

1.  
2. #pragma strict
3.  
4. class CharacterJump
5. {
6.     public var jumping : boolean;
7.     public var minHeight : float;
8.     public var maxHeight : float;
9.     public var gravity : float;
10. }
11. public var jump : CharacterJump;
12.  
13. function Start ()
14. {
15.     jump.jumping = true;
16.    
17.     //This will apply the gravity for character
18.     Physics.gravity = Vector3.up * jump.gravity;
19. }
20.  
21. function Update ()
22. {
23.     ApplyJump ();
24.     ApplyExtraJump ();
25. }
26.  
27. function ApplyJump ()
28. {
29.     if (jump.jumping)
30.     {
31.         if (Input.GetButtonDown ("jump"))
32.         {
33.             rigidbody.velocity = Vector3.up * jump.minHeight;
34.         }
35.     }
36.    
37.     if (rigidbody.velocity.magnitude > 0.1)
38.     {
39.         jump.jumping = false;
40.     }
41.     else
42.     {
43.         jump.jumping = true;
44.     }
45. }
46.  
47. function ApplyExtraJump ()
48. {
49.    
50. }
51.  

As for now my character will jump at min height if I push the jump button, now what I want to do next is when I hold down the jump button a bit longer it will add the jump height to max height. How would I do this? I tried used timer for the button hold but it did not work.

 

Line 17 seems a bad idea - Physics.gravity is global, you don't want individual object scripts to try to modify it directly.

To make the character stay in the air longer, apply an upwards force (less than gravity times mass!) while the button is held down. You could do this by modifying velocity again, but I'd steer clear of that in general.

 

So instead of using Physics.gravity. I change it to this :

Code (csharp):

1.  
2. function ApplyJump ()
3. {
4.     if (jump.jumping)
5.     {
6.         if (Input.GetButtonDown ("jump"))
7.         {
8.             rigidbody.velocity = Vector3.up * jump.minHeight;
9.         }
10.     }
11.    
12.     if (rigidbody.velocity.magnitude > 0.1)
13.     {
14.         jump.jumping = false;
15.        
16.         rigidbody.velocity.y -= jump.gravity * Time.deltaTime;
17.     }
18.     else
19.     {
20.         jump.jumping = true;
21.     }
22. }
23.  

Im not fully understand this. Can you please elaborate. Thank you.

 

Here is the code. When you press space it jumps and if you hold space for 1 second (play with that value) it jumps again.
Dont change gravity directly nor change rigidbody.velocity for this matter. Use AddForce or AddRelativeForce for jump and movement.

Code (csharp):

1.  
2.     #pragma strict
3.     private var jumpCounter : float;
4.    
5.     class CharacterJump
6.     {
7.         //public var jumping : boolean;
8.         public var jumpForce : float;
9.         public var extraJumpForce : float;
10.         //public var gravity : float;
11.         public var jumped : boolean; // if you jumped
12.         public var jumpedMore : boolean; // if you jumped more
13.     }
14.     public var jump : CharacterJump;
15.      
16.     function Start ()
17.     {
18.     }
19.      
20.     function Update ()
21.     {
22.         if(Input.GetButton ("Jump")){
23.             if(!jump.jumped){
24.                 jump.jumped = ApplyJump();
25.             }
26.             else{
27.                 // if you hold space for   1 second   make extra jump
28.                 if(jump.jumpedMore == false  jumpCounter > 1){
29.                      jump.jumpedMore = ApplyExtraJump ();
30.                 }
31.                 else{
32.                     jumpCounter += 1*Time.deltaTime;
33.                 }
34.             }
35.         }
36.         if(Input.GetButtonUp ("Jump")){
37.             // get ready for next jump when you release jump key
38.             jump.jumped = false;
39.             jump.jumpedMore = false;
40.             jumpCounter = 0;
41.         }
42.     }
43.      
44.     function ApplyJump () : boolean
45.     {
46.         rigidbody.AddForce(Vector3.up * jump.jumpForce); // add upward force instead of changing gravity
47.         return true; // normal jump executed
48.     }
49.      
50.     function ApplyExtraJump () : boolean
51.     {
52.         rigidbody.AddForce(Vector3.up * jump.extraJumpForce);
53.         return true; // extra jump executed
54.     }
55.  

 

Hey there guys, okay I manage to do jump for my character, here what I did :

Code (csharp):

1.  
2. #pragma strict
3.  
4. private var jumpCounter : float;
5. public var minHeight : float;
6. public var maxHeight : float;
7. public var gravity : float;
8. public var canJump : boolean;
9. public var jump : boolean;
10.  
11. function Start ()
12. {
13.     canJump = true;
14. }
15.  
16. function Update ()
17. {
18.     ApplyJump ();
19.     ApplyGravity ();
20. }
21.  
22. function ApplyJump ()
23. {
24.     if (canJump)
25.     {
26.         if (Input.GetButton ("jump"))
27.         {
28.             rigidbody.velocity = Vector3.up * minHeight;
29.  
30.             jumpCounter += 1 * Time.deltaTime;
31.         }  
32.     }
33.    
34.     if (canJump  jumpCounter > 0.1)
35.     {
36.         rigidbody.velocity.y += maxHeight;
37.         canJump = false;
38.     }
39.    
40.     if (Input.GetButtonUp ("jump"))
41.     {
42.         jumpCounter = 0;
43.         canJump = true;
44.     }
45. }
46.  
47. function ApplyGravity ()
48. {
49.     if (rigidbody.velocity.magnitude > 0.1)
50.     {
51.         rigidbody.velocity.y -= gravity * Time.deltaTime;
52.     }
53.    
54.     if (Physics.Raycast (transform.position, -transform.up, 1))
55.     {
56.         jump = true;
57.     }
58.     else
59.     {
60.         jump = false;
61.     }
62. }
63.  

Having a bit of trouble figureing out this one thing, how do I prevent people from spamming the jump button, because right now, if I keep on tapping the jump button my chracter will keep on jumping up and up and up until i release the jump button. Down here I show you guys what I meant.

Thanks

 

bump

 

Bit Late, but you can put a trigger on the ground which sends a message to the object so this one knows whether it can jump or not (you can use a boolean to check this).

 

bit late. crappy solution. what was the point.

only necro if you have something of quality to add.