How Do I Make a Fast-Fall Script?

Okay, my other problem is solved, by myself, I might add. Yay! Now, I've been trying to make a fast-fall system, as is implemented in some fighter games (like Super Smash Bros). For some reason, I can crouch while in the air and do not fall faster. I know there's a lot in this script but it's the player-character script.

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class PlayerController : MonoBehaviour
5. {
6.     public float maxSpeed = 10f;
7.     bool facingRight = true;
8.    
9.     Animator anim;
10.  
11.     public float jumpForce = 50f;
12.     public float normalfall = 2f;
13.     public float fastfall = 9f;
14.     public bool grounded;
15.    
16.     void Start ()
17.     {
18.         anim = GetComponent<Animator>();
19.        
20.         this.rigidbody2D.gravityScale = normalfall;
21.     }
22.    
23.     void  Update ()
24.     {  
25.  
26.     }
27.    
28.     void FixedUpdate ()
29.     {
30.         anim.SetFloat ("vSpeed", rigidbody2D.velocity.y);
31.        
32.         if (grounded = true)
33.         {
34.             if (Input.GetButton ("Down"))
35.             anim.SetBool ("Crouch", true);
36.  
37.             if (Input.GetButtonUp ("Down"))
38.             anim.SetBool ("Crouch", false);
39.         }
40.         else if (grounded = false) //This does not work
41.         {
42.             if (Input.GetButton ("Down"))
43.             this.rigidbody2D.gravityScale = fastfall;
44.  
45.             if (Input.GetButtonUp ("Down"))
46.                 this.rigidbody2D.gravityScale = normalfall;
47.         }
48.        
49.         float move = Input.GetAxis ("Horizontal");
50.        
51.         anim.SetFloat ("Speed", Mathf.Abs (move));
52.        
53.         if (move > 0 && !facingRight)
54.             Flip ();
55.         else if (move < 0 && facingRight)
56.             Flip ();
57.  
58.         rigidbody2D.velocity = new Vector2 (move * maxSpeed, rigidbody2D.velocity.y);
59.  
60.         if (Input.GetButton ("Jump"))
61.         {
62.             grounded = false;
63.             anim.SetBool ("grounded", false);
64.         }
65.     }
66.    
67.     void OnCollisionStay2D ()
68.     {
69.         grounded = true;
70.         anim.SetBool ("grounded", true);
71.  
72.         if (grounded && Input.GetButtonDown ("Jump"))
73.         {
74.             rigidbody2D.AddForce(new Vector2(0, jumpForce));
75.         }
76.     }
77.    
78.     void Flip()
79.     {
80.         facingRight = !facingRight;
81.         Vector3 theScale = transform.localScale;
82.         theScale.x *= -1;
83.         transform.localScale = theScale;
84.     }
85. }

 

Surely the:

Code (CSharp):

1.  else if (grounded = false) //This does not work

should read:

Code (CSharp):

1.  else if (grounded == false) //This does not work

Usually OnCollisionStay2D is a bit flakey, so you probably want to use a raycast to check whether you are grounded or not. You do it more or less like this:

Code (CSharp):

1.  
2. bool grounded = Physics2D.Raycast(raycast.position,
3.  -Vector2.up, .1f, 1 << LayerMask.NameToLayer("Floor"));
4.  

 

Oh, I forgot, GetButtonUp and GetButtonDown don't work as intended in FixedUpdate(). They should only be used in Update().

 

Well, that is definitely news to me! I'll switch 'em over.

 

HOWEVER: I now can't seem to make the fast-fall gravity relent upon releasing the "Down" key. Any ideas?

Code (CSharp):

1. void Update ()
2. {
3.     if (grounded)
4.     {
5.         if (Input.GetButton ("Down"))
6.         anim.SetBool ("Crouch", true);
7.        
8.         if (Input.GetButtonUp ("Down"))
9.         anim.SetBool ("Crouch", false);
10.     }
11.    
12.     else
13.     {
14.         if (Input.GetButton ("Down"))
15.         this.rigidbody2D.gravityScale = fastfall;
16.        
17.         if (Input.GetButtonUp ("Down"))
18.         this.rigidbody2D.gravityScale = normalfall;
19.     }
20. }

 

Can't really see anything wrong with your code. You might want to change it to this, but it really shouldn't matter:

Code (CSharp):

1.         if (Input.GetButton ("Down"))
2.             this.rigidbody2D.gravityScale = fastfall;
3.        else
4.             this.rigidbody2D.gravityScale = normalfall;

 

I think my keyboard is just relentlessly horrible. Thanks, though!

 

first,you may have noticed that, the state clip starts a little offset from zero.Why was that?

secondly,the animation clip's length can't match with the length of the clip in animation state.You can see the picture I attach.In fact the animation clip last for 6 frames,but 9 frames in mecanim state.Why was that?

There will be some mistakes,when Im using codes to control the time precisely.For example,there is 16frames for me to input a key to change into fly state,when the jump state start.Then I set the end of the transition to about 16frames in the preview.If I input the fly key at the very end of the transition,say 15frame, there will be a fly trigger,but no fly animation,which means the animation time is not the same as the game time?