Develop Reference

Making a 2d player look at the cursor, and then move towards it

This is the code:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlayerMovement : MonoBehaviour
{
// Tweekable move speed
public float MoveSpeed = 4;
// Set what distance it should be from the target
int MaxDist = 10;
int MinDist = 5;
// This is the target
public Transform Mouse;
// Start is called before the first frame update
void Start()
{
}
// Update is called once per frame
void Update()
{
// Keep looking at an object
transform.LookAt();
// Turn off gravity
Physics2D.gravity = Vector2.zero;
// When distance is over minimun
if (Vector3.Distance(Mouse.position, Mouse.position) >= MinDist)
{
// Keep distance
transform.position += transform.forward * MoveSpeed * Time.deltaTime;
// When it's between max and minimun
if (Vector3.Distance(transform.position, Mouse.position) <= MaxDist)
{
}
}
}
// I imported this code from another project so the enemy keeps looking at the player, and keeps his distance. it was a 3D project, so there may be more errors, and this is also my first time creating a game. Be gentle

I am working on a similar project right now.
Here is the code I use to rotate the player (first part) and then move it into that direction (second part):
public Rigidbody2D rb;
public float speed;
void Update()
{
//get mouse position
Vector3 mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
//calculating the angle
float AngleRad = Mathf.Atan2(mousePos.y - transform.position.y, mousePos.x -
transform.position.x);
float AngleDeg = (180 / Mathf.PI) * AngleRad;
//rotating the player
Player.transform.rotation = Quaternion.Euler(0, 0, AngleDeg);
//second part
Vector3 mouseDir = mousePos - transform.position;
mouseDir.z = 0f;
mouseDir = mouseDir.normalized;
rb.AddForce(mouseDir * speed);
}
If the player rotates, but it is looking in the wrong way (in my case), then play around with the the last line of the first part. The following code worked fine for me:
transform.rotation = Quaternion.Euler(0, 0, AngleDeg - 90);
If you want the player to move at a constant speed, then you can use
rb.velocity = mouseDir * speed;
instead of
rb.AddForce(mouseDir * speed);
in the last line of the second part.
Your Player-Gameobject needs a Rigidbody2D component. I also added an if-statement around the second part, so the player only moves to the wanted direction when (for example) space is pressed, but always looks to the mouse.

Teleport while Controlling GameObject in Unity3D

I am a freshman design student and they've asked us to create a game on unity3D without much training on it so needless to say I don't know much except for the super basic stuff. I don't know anything about c# and I've been having an issue making a gameobject teleport. I've spent 6 hours searching for a solution online and the only conclusion I got to was that my object is probably having issues teleporting because of the way I am controlling it - something to do with the controller remembering the last position before the teleport and returning to it. I have no idea how to fix it though.
So this is what my scene looks like: I have a sphere as my character, I move it to this other object that has a collider as trigger which then teleports my sphere to a different point (black object) on the terrain. As soon as my object reaches there, it starts sliding back to the point where the teleport happened. I even tried edit > project settings > physics > auto sync transforms as many suggested that and it worked for them.
This is the code by which I control my player:
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class MyPlayer : MonoBehaviour
{
public float speed = 1;
public float spacing = 1;
private Vector3 pos;
// Use this for initialization
void Awake()
{
pos = transform.position;
}
// Update is called once per frame
void Update()
{
if (Input.GetKeyDown(KeyCode.W))
pos.x += spacing;
if (Input.GetKeyDown(KeyCode.S))
pos.x -= spacing;
if (Input.GetKeyDown(KeyCode.D))
pos.z -= spacing;
if (Input.GetKeyDown(KeyCode.A))
pos.z += spacing;
transform.position = Vector3.MoveTowards(transform.position, pos, speed * Time.deltaTime);
}
}
and I also have a camera that follows the sphere using this code
using UnityEngine;
using System.Collections;
public class CompleteCameraController : MonoBehaviour {
public GameObject player; //Public variable to store a reference to the player game object
private Vector3 offset; //Private variable to store the offset distance between the player and camera
// Use this for initialization
void Start ()
{
//Calculate and store the offset value by getting the distance between the player's position and camera's position.
offset = transform.position - player.transform.position;
}
// LateUpdate is called after Update each frame
void LateUpdate ()
{
// Set the position of the camera's transform to be the same as the player's, but offset by the calculated offset distance.
transform.position = player.transform.position + offset;
}
}
and I have another code on the camera that makes me be able to look around using my mouse
using UnityEngine;
using System.Collections;
public class FlyCamera : MonoBehaviour
{
/*
Writen by Windexglow 11-13-10. Use it, edit it, steal it I don't care.
Converted to C# 27-02-13 - no credit wanted.
Simple flycam I made, since I couldn't find any others made public.
Made simple to use (drag and drop, done) for regular keyboard layout
wasd : basic movement
shift : Makes camera accelerate
space : Moves camera on X and Z axis only. So camera doesn't gain any height*/
float mainSpeed = 700.0f; //regular speed
float shiftAdd = 950.0f; //multiplied by how long shift is held. Basically running
float maxShift = 2000.0f; //Maximum speed when holdin gshift
float camSens = 0.25f; //How sensitive it with mouse
private Vector3 lastMouse = new Vector3(255, 255, 255); //kind of in the middle of the screen, rather than at the top (play)
private float totalRun = 1.0f;
void Update()
{
lastMouse = Input.mousePosition - lastMouse;
lastMouse = new Vector3(-lastMouse.y * camSens, lastMouse.x * camSens, 0);
lastMouse = new Vector3(transform.eulerAngles.x + lastMouse.x, transform.eulerAngles.y + lastMouse.y, 0);
transform.eulerAngles = lastMouse;
lastMouse = Input.mousePosition;
//Mouse camera angle done.
//Keyboard commands
float f = 0.0f;
Vector3 p = GetBaseInput();
if (Input.GetKey(KeyCode.LeftShift))
{
totalRun += Time.deltaTime;
p = p * totalRun * shiftAdd;
p.x = Mathf.Clamp(p.x, -maxShift, maxShift);
p.y = Mathf.Clamp(p.y, -maxShift, maxShift);
p.z = Mathf.Clamp(p.z, -maxShift, maxShift);
}
else
{
totalRun = Mathf.Clamp(totalRun * 0.5f, 1f, 1000f);
p = p * mainSpeed;
}
p = p * Time.deltaTime;
Vector3 newPosition = transform.position;
if (Input.GetKey(KeyCode.Space))
{ //If player wants to move on X and Z axis only
transform.Translate(p);
newPosition.x = transform.position.x;
newPosition.z = transform.position.z;
transform.position = newPosition;
}
else
{
transform.Translate(p);
}
}
private Vector3 GetBaseInput()
{ //returns the basic values, if it's 0 than it's not active.
Vector3 p_Velocity = new Vector3();
if (Input.GetKey(KeyCode.W))
{
p_Velocity += new Vector3(0, 0, 1);
}
if (Input.GetKey(KeyCode.S))
{
p_Velocity += new Vector3(0, 0, -1);
}
if (Input.GetKey(KeyCode.A))
{
p_Velocity += new Vector3(-1, 0, 0);
}
if (Input.GetKey(KeyCode.D))
{
p_Velocity += new Vector3(1, 0, 0);
}
return p_Velocity;
}
}
Please let me know if there's a specific part of my code that I need to edit to resolve this or alternatively if you have a different code that won't give me this issue, that would make my life so much easier. If I need to edit something or you're sharing a code, please respond with the complete (corrected) code because otherwise I will just be even more confused.
I know this is a super long post and I am sorry but I am really desperate. It's been really hard studying online and basically having to teach myself all of this. This is for a final project so I will really appreciate any help you can throw my way. Thank you for reading and thanks for any help in advance.
EDIT: The teleport code is executing fine because I do teleport to the chosen location, I just end up sliding back to the point which I teleported from.
This is the teleporting code I am using.
using UnityEngine;
using System.Collections;
public class Teleport : MonoBehaviour
{
public GameObject ui;
public GameObject objToTP;
public Transform tpLoc;
void Start()
{
ui.SetActive(false);
}
void OnTriggerStay(Collider other)
{
ui.SetActive(true);
if ((other.gameObject.tag == "Player") && Input.GetKeyDown(KeyCode.E))
{
objToTP.transform.position = tpLoc.transform.position;
}
}
void OnTriggerExit()
{
ui.SetActive(false);
}
}

Ok, so the main reason why your character is drifting back to original position is that the pos variable in the MyPlayer script stays the same after teleporting.
Remedy for that will be changing pos variable from Teleport script after objToTP.transform.position = tpLoc.transform.position;. Something like objToTP.gameobject.GetComponent<MyPlayer>().pos = tpLoc.transform.position;
But make sure that objToTP has component MyPlayer and pos in MyPlayer is public.
Once again: it's a simple way to resolve your problem. In a real project you should create more flexible architecture, but that's a different story.

I believe that you sliding back because you moving player with transform.position = Vector3.MoveTowards in Update().
And you moving it to coordinates that was got from your input

What formula would I use to relate velocity to rotation I Unity?

I'm messing around in Unity trying to create a script for a physics based arrow.
I have it arcing properly, but it's still straight up throughout it's flight.
I'm trying to use Quaternion.LookRotation to change it's rotation based on the velocity (R = 0 at V = Vinitial, R = 90 at V = 0, and R = 180 at V = -Vinitial) but I haven't been able to puzzle out what formula I would use.
Any help would be appreciated.
EDIT
With help from the responses, I was able to get it working as I intended. Incase anyone stumbles across this looking for help, my end code looked like this:
private void Update()
{
if (ForceSet)
{
ForceSet = false;
initialVelocity = rb.velocity;
EndAngleOffset = .33f * rb.velocity.y;
}
if (stuckTarget == null)
{
Vector3 Forward;
Vector3 Upward;
if (rb.velocity.y > 0)
{
Forward = new Vector3(rb.velocity.x, -((-initialVelocity.y + rb.velocity.y - EndAngleOffset) * (-initialVelocity.y + rb.velocity.y - EndAngleOffset)), rb.velocity.z);
Upward = new Vector3(0, 1, 0);
}
else
{
Forward = new Vector3(rb.velocity.x, ((initialVelocity.y + rb.velocity.y + EndAngleOffset) * (initialVelocity.y + rb.velocity.y + EndAngleOffset)), rb.velocity.z);
Upward = new Vector3(0, -1, 0);
}
rb.rotation = Quaternion.LookRotation(Forward, Upward);
}
(ForceSet is set equal to true the when applying the launching force to the 'Arrow')

If you have access to the arrows Rigidbody component, you can access it's velocity property and set its rotation to be equal to its velocity.
I recommend when making modifications to a Rigidbody's transform that you use the Rigidbody methods. This ensures that values are properly updated with Unity's physics system.
using UnityEngine;
public class ArrowBehaviour : MonoBehaviour
{
private Rigidbody rigidbody;
private void Awake()
{
rigidbody = GetComponent<Rigidbody>();
}
private void Update()
{
rigidbody.rotation = Quaternion.LookRotation(rigidbody.velocity, Vector3.up);
}
}
Depending on the circumstances, you might want to change Update to FixedUpdate.
EDIT:
There was a bug in the above code I fixed; that's what you get when you write it at 2am. I'd give it another go and see if that works for you.
In an ideal world, you would pre-compute the path of the arrow so that you could perform any procedural animation to the arrow you would like.
You could also calculate an X rotation to use instead, which will fake the effect.
using UnityEngine;
public class ArrowBehaviour : MonoBehaviour
{
[SerializeField] private float lookMagnitude = 45.0f;
[SerializeField] private float velocitySensitivity;
private Rigidbody rigidbody;
private void Awake()
{
rigidbody = GetComponent<Rigidbody>();
}
private void Update()
{
// Determine how much we want to fake the rotation by.
var lookStrength = Mathf.InverseLerp(-velocitySensitivity, velocitySensitivity, rigidbody.velocity)
var targetEulerAngles = new Vector3(
Mathf.Lerp(-lookMagnitude, lookMagnitude, lookStrength),
transform.localEulerAngles.y,
transform.localEulerAngles.z
);
// Rotate the transform
transform.localEulerAngles = targetEulerAngles;
// Alternatively, interpolate to the target angle.
/* transform.localEulerAngles = Vector3.Lerp(
* transform.localEulerAngles,
* targetEulerAngles,
* Time.deltaTime * rotationSpeed
* );
*/
}
}

It should be fine just getting the transform rotation and setting it equal to Quaternion.LookRotation(velocity)

How do i make it into a smooth camera? (unity C# programming)

This is what i got and why does this website want me to put more explaining when i clarified above well i want to achieve a smooth camera control where the player is in the middle of the camera if the mouse is in the middle but as it moves toward a direction i want the camera to move just a little bit to reveal terrain (here i have 2 problems:
1.The camera doesnt move if the mouse is at the point 0,0 of the screen and i want it to be the center of the camera
2. the camera drifts away in that direction, it doesnt stop like i want to make it):
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class CameraController : MonoBehaviour {
// Camera cam = Camera.main.orthographicSize;
//Vector2 camcenter = new Vector2(cam * 2, camheight);
public GameObject mage;
private Vector3 offset;
public float mincam = 30f;
public float maxcam = 120f;
public bool mouse_smooth_cam = false;
// Update is called once per frame
void LateUpdate ()
{
offset = Input.mousePosition / 100 + transform.position - mage.transform.position;
transform.position = mage.transform.position + offset;
}
void Update()
{
HandleZoom();
}
private void HandleZoom()
{
float scrollValue = Input.mouseScrollDelta.y;
float newCamSize = Camera.main.orthographicSize - scrollValue*4;
Camera.main.orthographicSize = Mathf.Clamp(newCamSize, mincam, maxcam);
}
}

Instead of Input.mousePosition / 100 use Camera.main.ScreenToWorldPoint(Input.mousePosition)
also always use Time.deltaTime in Update methods
var PAN_SPEED = 30f;
var mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
offset = mousePos + transform.position - mage.transform.position;
transform.position = mage.transform.position + offset * Time.deltaTime * PAN_SPEED;

Collision detection script fails sometimes

For the most part this script works, however every now and then an enemy will fail at pathfinding and go through a building or wall. Is there a way i can stop this?
using UnityEngine;
using System.Collections;
namespace Daniel {
public class EnemyAI : Living {
// Detection private int range = 10; private float speed = 10f; private bool isThereAnyThing = false;
// Waypoints/Targets
public GameObject[] targets;
private float rotationSpeed = 900f;
private RaycastHit hit;
GameObject target;
[SerializeField]
private int randomTarget = 0;
[SerializeField]
float timeToNextCheck = 3;
public float effectTimer = 2f;
public GameObject deathEffect;
public LayerMask detectThis;
void Start()
{
randomTarget = Random.Range(0, 8);
target = targets[randomTarget];
}
void FixedUpdate()
{
timeToNextCheck = timeToNextCheck - Time.deltaTime;
ScanForNewWaypoint();
LookAtTarget();
Move();
CheckForObsticales();
}
void LookAtTarget()
{
//Look At Somthly Towards the Target if there is nothing in front.
if (!isThereAnyThing)
{
Vector3 relativePos = target.transform.position - transform.position;
Quaternion rotation = Quaternion.LookRotation(relativePos);
transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime);
}
}
void Move()
{
// Enemy translate in forward direction.
transform.Translate(Vector3.forward * Time.deltaTime * speed);
}
public void CheckForObsticales()
{
//Checking for any Obstacle in front.
// Two rays left and right to the object to detect the obstacle.
Transform leftRay = transform;
Transform rightRay = transform;
//Use Phyics.RayCast to detect the obstacle
if (Physics.Raycast(leftRay.position + (transform.right * 7f), transform.forward, out hit, range, detectThis) || Physics.Raycast(rightRay.position - (transform.right * 7f), transform.forward, out hit, range))
{
if (hit.collider.gameObject.CompareTag("Obstacles"))
{
isThereAnyThing = true;
transform.Rotate(Vector3.up * Time.deltaTime * rotationSpeed);
}
}
// Now Two More RayCast At The End of Object to detect that object has already pass the obsatacle.
// Just making this boolean variable false it means there is nothing in front of object.
if (Physics.Raycast(transform.position - (transform.forward * 4), transform.right, out hit, 10, detectThis) ||
Physics.Raycast(transform.position - (transform.forward * 4), -transform.right, out hit, 10, detectThis))
{
if (hit.collider.gameObject.CompareTag("Obstacles"))
{
isThereAnyThing = false;
}
}
}
public void ScanForNewWaypoint()
{
CheckForObsticales();
if (timeToNextCheck <= 0)
{
timeToNextCheck = Random.Range(6, 3);
randomTarget = Random.Range(0, 8);
target = targets[randomTarget];
}
}
public override void TakeHit(float dmg, Vector3 hitPoint, Vector3 hitDirection)
{
if (dmg >= health)
{
Destroy(Instantiate(deathEffect, hitPoint, Quaternion.FromToRotation(Vector3.forward, hitDirection)) as GameObject, effectTimer);
Debug.Log("Exploded");
}
base.TakeHit(dmg, hitPoint, hitDirection);
}
}
}

Okay now this is one of the most common problems people face when playing with Physics Engine and believe me there are lot of factors that adds up to the result/consequences you are facing. Most common solutions devised by people is to use Update which is Executed Every Frame for Physics calculation which is Entirely Wrong. All the physics related calculation needs to be performed inside the Fixed Update otherwise it will be too expensive to execute physics based simulations in the Update which means every single frame. In your case where your Enemy is going through walls and Physics Collisions are missing the best solution you can take is to tweak some Physics Related Properties in Unity these are located in Edit>>>Project Settings>>>Time change the Time Step and Maximum Allowed Time Step in the inspector to set your collisions right. There are some other things to keep in mind too while dealing with physics like scale, mass and colliders etc. Here is a Link concerning the detailed mechanics of the physics settings in unity. Make sure you read and understand the contents of the link before working and tweaking physics settings.