Unity CharacterController Jumping really jerky

Questions & Answers
1

so I have a character walking around however when i try and jump its jerky …like my character just jumps up and then falls straight back down fast …its like it pops its head up and down really quickly

its like a little spasm up and then down really fast

using UnityEngine;
using System.Collections;

public class CharacterCont : MonoBehaviour {

	public float  movespeed = 10.0f;
	public float mouseSensitivity = 6.0f;
	float verticalRotation = 0;
	public float upDownRange = 60.0f;
	float verticalVelocity = 0;
	public float jumpheight = 15.0f;

	// Use this for initialization
	void Start () {
	;
	}
	
	// Update is called once per frame
	void Update() {
		CharacterController cc = transform.GetComponent<CharacterController>();

		//mouse look
		
		float rotLeftRight = Input.GetAxis("Mouse X") * mouseSensitivity;
		transform.Rotate(0, rotLeftRight, 0);
		verticalRotation -= Input.GetAxis("Mouse Y") * mouseSensitivity;
		verticalRotation = Mathf.Clamp(verticalRotation, -upDownRange, upDownRange);
		Camera.main.transform.localRotation = Quaternion.Euler(verticalRotation, 0, 0);



		//movement
	

		

		float Fspeed = Input.GetAxis ("Vertical") * movespeed * Time.deltaTime;
		float Sspeed = Input.GetAxis ("Horizontal") * movespeed *  Time.deltaTime;


		verticalVelocity += Physics.gravity.y * Time.deltaTime;
		
		if( cc.isGrounded && Input.GetButton("Jump") ) {
			verticalVelocity = jumpheight * Time.deltaTime;
		}
		
		Vector3 speed = new Vector3( Sspeed, verticalVelocity, Fspeed );
		


		

		speed = transform.rotation * speed;
			   
		cc.Move (speed);

	
	}

can i have solutions in c# only please

2

I would suspect this is due to the magnitude of the gravity force you are applying to the character.

verticalVelocity += Physics.gravity.y * Time.deltaTime;

Turning down this Physics.gravity value should make the jump higher, and longer.

Also, you might want to consider using a rigidbody and the addForce function, rather than just modifying the velocity directly. AddForce will take the rigidbody’s mass into consideration, and rigidbodies automatically apply the force of gravity every cycle.