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why is this Unity 3D jump script doesn't work?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class movement : MonoBehaviour
{
public Rigidbody rb;
public float MouseSensitivity;
public float MoveSpeed;
public float jumpForce;
void Start ()
{
}
void Update()
{
//Look around
rb.MoveRotation(rb.rotation * Quaternion.Euler(new Vector3(0, Input.GetAxis("Mouse X") * MouseSensitivity, 0)));
//Move
rb.MovePosition(transform.position + (transform.forward * Input.GetAxis("Vertical") * MoveSpeed) + (transform.right * Input.GetAxis("Horizontal") * MoveSpeed));
//Jump
if (Input.GetKeyDown("space"))
{
print("clicked");
rb.AddForce(Vector3.up * jumpForce);
}
}
}
this is my code and a picture of the player object when I'm trying to jump it doesn't work but it does print clicked I tried to do many things but nothing worked so if you know how to solve the issue please tell me

RigidBody.AddForce has a second parameter of type ForceMode that defaults to ForceMode.Force. That particular ForceMode is only good for continual application of force (like a rocket's thruster). For a feature like jumping, you'll either want to use ForceMode.Impulse or ForceMode.VelocityChange.
// Pick one or the other
rb.AddForce(Vector3.up * jumpForce, ForceMode.Impulse);
rb.AddForce(Vector3.up * jumpForce, ForceMode.VelocityChange);
Also, make sure your jumpForce value isn't tiny or it'll be an unnoticeably small "jump."

Firstly, physics calculations should generally be calculated inside of FixedUpdate(). This is described in the unity documentation here.
Edit: To make it more clear for the comment on my post. Input should be located inside of the Update() method whilst physics calculations should generally be calculated inside of the FixedUpdate() method.
If it is decided that you want to register input inside of Update() and physics calculations, based on that input, inside of FixedUpdate() then you would use a boolean switch.
Looking at your code I would say that either:
The mass of your Rigidbody is high and your jumpForce variable is too low, trying increasing the value of the jumpForce variable to see if the GameObject moves.
Your Rigidbody has the Is Kinematic checkbox selected.
AddForce is defaulting the ForceMode to ForceMode.Force, try using a different force mode like ForceMode.Impulse to deliver a quick force to the GameObject. In your case this would look like rb.AddForce(Vector3.up * jumpForce, ForceMode.Impulse);
Hope this helps.

Unity3D c# 2D Game Camera Follow is making jumps

I made an 2D endless runner game using Unity, where the Player Object moves upwards, but for the Viewer he remains on the same spot because the Camera is following him. The Following works pretty well, but the problem is that it is making small jumps every few seconds. The jumps are small and thus are not affecting the gameplay in general but they are big enough to make it seem like the game is not running smoothly.
I can't even tell whether it is the Camera that is making the jumps or the Player Object. But I think it is the Camera, because the spawning obstacles are also making jumps. What may be the issue? Am I using the right method for the Camera?
public class Player
{
float speed = 5f;
void Update()
{
transform.Translate(0, speed*Time.deltaTime, 0);
}
}
And this is the Script which is attached to the Camera:
public class CameraFollow
{
private Vector3 FollowVector;
public Transform Player;
void LadeUpdate()
{
FollowVector = Player.position - new Vector3(0, -4f, 10);
transform.position = Vector3.Lerp(transform.position, FollowVector, Time.deltaTime * 4f);
}
}

Does the jump happen every 4 seconds? I think the problem might be in your Vector3.Lerp function. It's basically a loose camera-follow, that takes 4 seconds (Time.deltaTime * 4f) to smoothly go from Point A to point B. Every 4 seconds it resets its path, hence the hop. At least that's my theory.
If you don't mind the camera rigidly following the player, I would just remove the Lerp and just set the transform.position to be the FollowVector value like so:
void LadeUpdate()
{
transform.position = Player.position - new Vector3(0, -4f, 10);
}

Try to use Vector3.MoveTowards
float step = speed * Time.deltaTime;
transform.position = Vector3.MoveTowards(transform.position, Player.position - new Vector3(0, -4f, 10f), step);

Trying to write a C# code to make a missile follow the player in Unity

I have been trying this for two days with no success. I cant figure out where I'm missing the point. All the missiles are moving towards the position of the target but not following it. The position remains fixed and all the newly created missiles come to this point instead of following the target.
Here is the code:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class HomingMissile : MonoBehaviour
{
private GameObject target; //changed to private
private Rigidbody rb;
public float rotationSpeed;
public float speed;
Quaternion rotateToTarget;
Vector3 direction;
private void Start()
{
target = GameObject.FindGameObjectWithTag("Player"); //uncommented this
rb = GetComponent<Rigidbody>();
}
private void FixedUpdate()
{
//made some modifications
Vector3 direction = (target.transform.position - transform.position).normalized;
float angle = Mathf.Atan2(direction.x, direction.z) * Mathf.Rad2Deg;//interchanged x and z
Quaternion rotateToTarget = Quaternion.Euler(0, angle, 0);
transform.rotation = Quaternion.Slerp(transform.rotation, rotateToTarget, Time.deltaTime * rotationSpeed);
Vector3 deltaPosition = speed * direction * Time.deltaTime;
rb.MovePosition(transform.position + deltaPosition);
}
}
I selected the target(transform) using the inspector.
I'm using Unity and C# obviously you know that.
What Im trying to achieve is that the missile should follow the position of the target in real time. And i can add the destroy code for the missile myself.
Note :
Please don't tag this as a duplicate. It is not.
The game is 2D where Y is always constant. Vertical axis is X and Horizontal axis is X. The objects are 3D. That's why I can't use rigidbody2D.
EDIT:
Code edited. The missile follows the target and also points to the direction of motion. How to make the missile make a circular rotation when it needs to rotate?

Firstly, consider:
Not modifying a rigidbody.velocity directly, as it will result in unrealistic behaviour
Using FixedUpdate() instead of Update() when controlling rigidbodies
Use rigidbody.movePosition() and rigidbody.moveRotation() instead. Here's an example:
Vector3 dir = (target.transform.position - transform.position).normalized;
Vector3 deltaPosition = speed * dir * Time.deltaTime;
rb.MovePosition(transform.position + deltaPosition);
Try out rigidbody.MoveRotation() yourself for practice.
Finally, understand that there are many ways to implement homing for missiles. Here's one that is commonly used in real life.
Edit: I will not recommend using rb.addForce() because if u try it out u will realise it is too indeterministic.

What's wrong with my Vehicle code?

I was trying to create a car in unity using a C# Script, everything seems to be fine, the car rotates left and right, except 1 problem. when I press the forward or backwards keys, the car moves left and right instead of forward and backwards, I can't see anything wrong with my code, here's my code:
using UnityEngine;
using System.Collections;
public class Car : MonoBehaviour {
private Rigidbody carRigid;
public int speed;
public int rotateSpeed;
// Use this for initialization
void Start () {
carRigid = GetComponent<Rigidbody> ();
}
// Update is called once per frame
void Update () {
}
void FixedUpdate(){
if (Input.GetButton("Forward")){
carRigid.AddForce (transform.forward * speed * Time.deltaTime);
}
if (Input.GetButton("Reverse")){
carRigid.AddForce (transform.forward * -speed * Time.deltaTime);
}
if (Input.GetButton("Left")){
transform.Rotate (0, rotateSpeed, 0);
}
if (Input.GetButton("Right")){
transform.Rotate (0, rotateSpeed, 0);
}
}
}

Your car is moving on another axis which is different than the axis you want. try transform.right / transform.left or transform.up / transform.down .

I've just tested your code in a blank Unity scene, and I think you AddForce() is the culprit!
I used
if (Input.GetKey(KeyCode.W))
{
transform.position += transform.forward * speed * Time.deltaTime;
}
and this seems to be working great!

Maybe it's because you have imported a 3D model which it's local forward is not correct.
You have some choices:
1) Fix it in the 3d modeling program an export it again.
2) Create an empty GameObject and make this the parent of your car. Assign the rigid body and relevant codes to this GameObject and Rotate the car model in it's local space until it's fixed ( 90 degrees I guess).
3) use transform.right or transform.left depending on the rotation of your model.
I personally prefer first choice.

Unity 2d jumping script

Does anyone have a good jumping script for 2d games in unity? The code I have works but still is far from jumping, it looks like it is flying.
using UnityEngine;
using System.Collections;
public class movingplayer : MonoBehaviour {
public Vector2 speed = new Vector2(10,10);
private Vector2 movement = new Vector2(1,1);
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update () {
float inputX = Input.GetAxis ("Horizontal");
float inputY = Input.GetAxis ("Vertical");
movement = new Vector2(
speed.x * inputX,
speed.y * inputY);
if (Input.GetKeyDown ("space")){
transform.Translate(Vector3.up * 260 * Time.deltaTime, Space.World);
}
}
void FixedUpdate()
{
// 5 - Move the game object
rigidbody2D.velocity = movement;
//rigidbody2D.AddForce(movement);
}
}

Usually for jumping people use Rigidbody2D.AddForce with Forcemode.Impulse. It may seem like your object is pushed once in Y axis and it will fall down automatically due to gravity.
Example:
rigidbody2D.AddForce(new Vector2(0, 10), ForceMode2D.Impulse);

The answer above is now obsolete with Unity 5 or newer. Use this instead!
GetComponent<Rigidbody2D>().AddForce(new Vector2(0,10), ForceMode2D.Impulse);
I also want to add that this leaves the jump height super private and only editable in the script, so this is what I did...
public float playerSpeed; //allows us to be able to change speed in Unity
public Vector2 jumpHeight;
// Use this for initialization
void Start () {
}
// Update is called once per frame
void Update ()
{
transform.Translate(playerSpeed * Time.deltaTime, 0f, 0f); //makes player run
if (Input.GetMouseButtonDown(0) || Input.GetKeyDown(KeyCode.Space)) //makes player jump
{
GetComponent<Rigidbody2D>().AddForce(jumpHeight, ForceMode2D.Impulse);
This makes it to where you can edit the jump height in Unity itself without having to go back to the script.
Side note - I wanted to comment on the answer above, but I can't because I'm new here. :)

Use Addforce() method of a rigidbody compenent, make sure rigidbody is attached to the object and gravity is enabled,
something like this
gameObj.rigidbody2D.AddForce(Vector3.up * 10 * Time.deltaTime); or
gameObj.rigidbody2D.AddForce(Vector3.up * 1000);
See which combination and what values matches your requirement and use accordingly.
Hope it helps