Jump script

Hello, I saw this script some where about 1/2 weeks back can't remember where tho, I've edit it abit. The problem i'm having atm with the code is when i jump it doesn't understand its touch the "Ground" again there like a little delay or lots of spamming to fix it. (The tag i'm using for the ground tag is "grounded" if you can help me it will be great help Script i am using can be found below.

Thank you very much

Luke

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Jump : MonoBehaviour {
5.     public bool grounded = true;
6.     public float jumpPower = 1;
7.     // Use this for initialization
8.     void Start () {
9.  
10.     }
11.  
12.     // Update is called once per frame
13.     void Update () {
14.         if(!grounded && GetComponent<Rigidbody>().velocity.y == 0) {
15.             grounded = true;
16.         }
17.         if (Input.GetButtonDown("Jump") && grounded == true) {
18.             GetComponent<Rigidbody>().AddForce(transform.up*jumpPower);
19.             grounded = false;
20.         }
21.     }
22.  
23.  
24. }

 

I opted for writing my own isGrounded function, using raycasting to find distance to ground to return a bool. Only need to use it when "jump" is being pressed. My primary reason for doing so was that I could find 0 information on the CharacterController.isGrounded

 

You can use a raycast condition to check if grounded

it casts a very small ray, directly below the player/GO and checks if it hits anything

Code (CSharp):

1. float dist;
2.  
3. public bool checkGrounded()
4. {
5.   return Physics.Raycast(transform.position, -Vector3.up, dist + 0.1f);
6. }

then if you want to call the code, use

Code (CSharp):

1. if (Input.GetButtonDown("Jump" && checkgrounded)
2. {
3. // jump
4. }

 

Code (CSharp):

1. if (Input.GetButtonDown("Jump") && checkGrounded)
2. {
3. // jump
4. }

Minor correction to the code.

But what Rob laid out is exactly what I was meaning. Mine is a bit more complicated, since I'm checking for what the collision tag is.
You can also replace

Code (csharp):

1. -Vector3.up

with

Code (csharp):

1. Vector3.down

I never really understood why people are constantly using negative up instead of down.