Adding momentum to jumping from previous movement

Questions & Answers
1

I created a move script with jumping. But when i jump it doesn’t add the momentum from moving in a direction and want to add this affect. Especially when running.

using UnityEngine;
using System.Collections;


public class PlayerMove : MonoBehaviour {

    public float MoveSpeed;//speed of movement
    public float jump_Force;// how much force is applied to jump
    public float air_resistance;//how much air resistance is present
    public bool can_Double_Jump;//jump twice
    public bool can_hover;//slowly desend in air
    public bool isGrounded;//is on the ground
    public bool Parachute = false;//parachute
    public bool isrunning;

	// Update is called once per frame
	void Update () {
        OpenParachute();
        Run();
        if (isGrounded)
        {
            if (Input.GetKey(KeyCode.W))
            {
                rigidbody.velocity = MoveSpeed * Vector3.forward;
            }
            else if (Input.GetKey(KeyCode.S))
            {
                rigidbody.velocity = MoveSpeed * Vector3.back;
            }
            if (Input.GetKey(KeyCode.A))
            {
                rigidbody.velocity = MoveSpeed * Vector3.left;
            }
            else if (Input.GetKey(KeyCode.D))
            {
                rigidbody.velocity = MoveSpeed * Vector3.right;
            }
            if (Input.GetButtonDown("Jump"))//can execute first jump
            {
                rigidbody.velocity = jump_Force * Vector3.up;//adds velocity upward
                isGrounded = false;//is not on ground
                can_Double_Jump = true;//can jump again
            }
        }
        else if (Input.GetButtonDown("Jump") && can_Double_Jump)// can jump again once first jump is done
        {
            rigidbody.velocity = new Vector3(0, jump_Force, 0);//adds a velocity upward
            can_Double_Jump = false;//cant  jump again
            can_hover = true;// can now hover if appropiate button is pressed
        }
        else if (Input.GetKey(KeyCode.LeftControl) && can_hover)//opens the parachute while falling
        {
            Parachute = true;//parachute is open
            can_hover = false;//cant open parachute again
        }
        if (Input.GetKeyUp(KeyCode.LeftControl))
        {
            Parachute = false;//releases parachute
        }
	}
    void OnCollisionEnter(Collision other)
    {
        if (other.gameObject.tag == "Ground")
        {
            isGrounded = true;//is on the ground
            Parachute = false;//parachute is not open
        }
    }
    void OpenParachute()//open parachute to decend slowly due to drag
    {

        if (Parachute)//is parachute  open
        {
            rigidbody.drag  = 10;//set air drag to 10
        }
        else
        {
            rigidbody.drag = .2f;//set air drag to .2
        }
    }
    void Run()
    {
        if (isrunning)
        {
            MoveSpeed = 10;//move speed increases
        }
        else
        {
            MoveSpeed = 4;
        }
        if (Input.GetKey(KeyCode.LeftShift))
        {
            isrunning = true;
        }
        if (Input.GetKeyUp(KeyCode.LeftShift))
        {
            isrunning = false;
        }
    }
}
2

You want to add the upwards velocity to your movement, instead of just setting your velocity to only upward movement, like you’re doing now. So, you need to change this bit:

if (Input.GetButtonDown("Jump"))//can execute first jump
{
    rigidbody.velocity = jump_Force * Vector3.up;//adds velocity upward
    ...
}

to this:

if (Input.GetButtonDown("Jump"))//can execute first jump
{
    rigidbody.velocity += jump_Force * Vector3.up;//adds velocity upward
    ...
}