Error CS0120 : An object reference is required to access non-static member

Questions & Answers
1

In trying to make a jumping script in C#, I ran across this error:

error CS0120: An object reference is required to access non-static member `UnityEngine.Rigidbody.velocity’

This is my program:

using UnityEngine;
using System.Collections;

public class Jump : MonoBehaviour {

	public float JumpHeight = 8.0f;
	private bool isFalling = false;
	

	void Update () {
		
		bool jump = Input.GetAxis("Jump") != 0;

		if (jump && isFalling == false) 
		{
			Vector3 velocity = Rigidbody.velocity;
			velocity.y += JumpHeight;
			Rigidbody.velocity = velocity;
			isFalling = true;
		}

}	
	
	void OnCollisionStay () 
	{
		isFalling = false;
	}
}

It would be very helpful if you could help me…

Thanks

2

Wait… It has to be this way…

void Update () {
     bool jump = Input.GetAxis("Jump") != 0;
     if (jump && isFalling == false) 
     {
         Vector3 velocity = GetComponent<Rigidbody>().velocity;
         velocity.y += JumpHeight;
         GetComponent<Rigidbody>().velocity = velocity;
         isFalling = true;
     }

}
Or this way

public RigidBody rig;
void Update () {
     
     bool jump = Input.GetAxis("Jump") != 0;

     if (jump && isFalling == false) 
     {
         Vector3 velocity = rig.velocity;
         velocity.y += JumpHeight;
         rig.velocity = velocity;
         isFalling = true;
     }

}

4

Honestly mate I’d ditch that jump bool and getaxis as it seems to be a really strange way to find out if space is being pressed you really only need this…

if (Input.GetKeyDown("space") && isFalling == false) {

I’ve converted this to an answer so you can accept as the actual solution is pretty drawn out over a lot of comments. Really I’d upvote the other answer as well, always good to show appreciation if someone has taken time to help out.

3

Edit: Sorry this not an answer.

I added a “Debug.Log” statement that tells me when I am in the if statement and when I am touching an object.

This is my program:

using UnityEngine;
using System.Collections;

public class Jump : MonoBehaviour {

	public float JumpHeight = 8.0f;
	private bool isFalling = false;
	public Rigidbody rig;
	

	void Update () {
		bool jump = Input.GetAxis("Jump") != 0;
		if (jump && isFalling == false) 
		{
			Vector3 velocity = rig.velocity;
			velocity.y += JumpHeight;
			rig.velocity = velocity;
			isFalling = true;
			Debug.Log("Jump");
		}
	}
		void OnCollisionStay () 
		{
			isFalling = false;
			Debug.Log("Grounded");
		}

}

When I press space the first time it prints it out in the console. Any other time it does not work. Also, it never prints out “Grounded”. It should when I touch an object. Could you give me a working jumping program or fix mine?

Thanks.