Develop Reference

Unity Pan and Zoom. Camera translate changes entirely once i click on screen

I'm trying to set Panning and zooming functions for my unity project. I got the codes i used from https://kylewbanks.com/blog/unity3d-panning-and-pinch-Ito-zoom-camera-with-touch-and-mouse-input. This is the code I used:
using UnityEngine;
using System.Collections;
public class CameraHandler : MonoBehaviour {
private static readonly float PanSpeed = 20f;
private static readonly float ZoomSpeedTouch = 0.1f;
private static readonly float ZoomSpeedMouse = 0.5f;
private static readonly float[] BoundsX = new float[]{-10f, 5f};
private static readonly float[] BoundsZ = new float[]{-18f, -4f};
private static readonly float[] ZoomBounds = new float[]{10f, 85f};
private Camera cam;
private Vector3 lastPanPosition;
private int panFingerId; // Touch mode only
private bool wasZoomingLastFrame; // Touch mode only
private Vector2[] lastZoomPositions; // Touch mode only
void Awake() {
cam = GetComponent<Camera>();
}
void Update() {
if (Input.touchSupported && Application.platform != RuntimePlatform.WebGLPlayer) {
HandleTouch();
} else {
HandleMouse();
}
}
void HandleTouch() {
switch(Input.touchCount) {
case 1: // Panning
wasZoomingLastFrame = false;
// If the touch began, capture its position and its finger ID.
// Otherwise, if the finger ID of the touch doesn't match, skip it.
Touch touch = Input.GetTouch(0);
if (touch.phase == TouchPhase.Began) {
lastPanPosition = touch.position;
panFingerId = touch.fingerId;
} else if (touch.fingerId == panFingerId && touch.phase == TouchPhase.Moved) {
PanCamera(touch.position);
}
break;
case 2: // Zooming
Vector2[] newPositions = new Vector2[]{Input.GetTouch(0).position, Input.GetTouch(1).position};
if (!wasZoomingLastFrame) {
lastZoomPositions = newPositions;
wasZoomingLastFrame = true;
} else {
// Zoom based on the distance between the new positions compared to the
// distance between the previous positions.
float newDistance = Vector2.Distance(newPositions[0], newPositions[1]);
float oldDistance = Vector2.Distance(lastZoomPositions[0], lastZoomPositions[1]);
float offset = newDistance - oldDistance;
ZoomCamera(offset, ZoomSpeedTouch);
lastZoomPositions = newPositions;
}
break;
default:
wasZoomingLastFrame = false;
break;
}
}
void HandleMouse() {
// On mouse down, capture it's position.
// Otherwise, if the mouse is still down, pan the camera.
if (Input.GetMouseButtonDown(0)) {
lastPanPosition = Input.mousePosition;
} else if (Input.GetMouseButton(0)) {
PanCamera(Input.mousePosition);
}
// Check for scrolling to zoom the camera
float scroll = Input.GetAxis("Mouse ScrollWheel");
ZoomCamera(scroll, ZoomSpeedMouse);
}
void PanCamera(Vector3 newPanPosition) {
// Determine how much to move the camera
Vector3 offset = cam.ScreenToViewportPoint(lastPanPosition - newPanPosition);
Vector3 move = new Vector3(offset.x * PanSpeed, 0, offset.y * PanSpeed);
// Perform the movement
transform.Translate(move, Space.World);
// Ensure the camera remains within bounds.
Vector3 pos = transform.position;
pos.x = Mathf.Clamp(transform.position.x, BoundsX[0], BoundsX[1]);
pos.z = Mathf.Clamp(transform.position.z, BoundsZ[0], BoundsZ[1]);
transform.position = pos;
// Cache the position
lastPanPosition = newPanPosition;
}
void ZoomCamera(float offset, float speed) {
if (offset == 0) {
return;
}
cam.fieldOfView = Mathf.Clamp(cam.fieldOfView - (offset * speed), ZoomBounds[0], ZoomBounds[1]);
}
}
The Panning and Zooming are working fine but only works when i make transform.position = pos; a comment. This line is what messes my entire panning and zooming system up. Once i make it a comment, The panning and zooming works, but without boundaries. And i need those boundaries. I'm using a terrain for my scene. that's where my entire project settles on.
What happens is when i press play on my unity editor, it all looks fine until i click on the screen. Once my mouse button touches the screen on play mode, my camera just faces an entirely different direction. The entire camera translate changes, i won't even see any of the Gameobjects on my scene anymore. Does anyone know where the problem could be coming from?

Raycast from the player position to the mouse position within range

I want to make a raycast from the player position to the mouse position but it should only have a certain range.
I have tried the following:
using UnityEngine;
public class Raycasting : MonoBehaviour
{
public GameManager gm;
Vector3 worldPosition;
public Transform player;
void FixedUpdate()
{
//Debug.Log(Camera.main.ScreenToWorldPoint(Input.mousePosition));
Debug.DrawLine(player.transform.position, Camera.main.ScreenToWorldPoint(Input.mousePosition), Color.green);
RaycastHit2D hit = Physics2D.Raycast(player.transform.position, Camera.main.ScreenToWorldPoint(Input.mousePosition), 10f);
if(hit.collider.tag == "Enemy")
{
Debug.Log (hit.collider.gameObject);
gm.Attack();
if (GameManager.enemyhealth <= 0)
{
Debug.Log("Enemy Died!");
Destroy(hit.transform.gameObject);
}
}
}
}
in Debug.DrawLine() it works exactly as I want it to — without the range —, but the raycast dosen't detect the enemies around it.

There is a trick to getting the ray end point to solve your problem. Just make sure your camera is orthographic. Also, by determining the enemy layer, detection problems are eliminated.
public GameObject player;
public LayerMask enemyLayer;
void Update()
{
var point = Camera.main.ScreenPointToRay(Input.mousePosition).GetPoint(1);
point.z = player.transform.position.z;
Debug.DrawLine(player.transform.position, point);
var enemy = Physics2D.Linecast(player.transform.position, point, enemyLayer.value);
if (enemy)
{
// do something...
}
}
Also, if you want to control the distance, please leave a comment.
Limited Distance to pointer
This algorithm limits the distance. For example, if you enter 5 for distance, the maximum magnitude will be 5, and if the mouse approaches below 5, it will set the mouse point to the maximum.
public GameObject player;
public LayerMask enemyLayer;
public float distance = 4.5f;
void FixedUpdate()
{
var point = Camera.main.ScreenToWorldPoint(Input.mousePosition);
point.z = player.transform.position.z;
var clamp = Vector3.ClampMagnitude(point - player.transform.position, distance);
Debug.DrawLine(player.transform.position, player.transform.position+clamp);
var enemy = Physics2D.Linecast(player.transform.position, player.transform.position+clamp, enemyLayer.value);
if (enemy)
{
Debug.Log("Detected..");
}
}
Fixed Distance along pointer direction
This algorithm takes the mouse to the player and then adds the size. Mouse location does not affect size and distance is fixed.
public GameObject player;
public LayerMask enemyLayer;
public float distance = 4.5f;
void FixedUpdate()
{
var point = Camera.main.ScreenPointToRay(Input.mousePosition).GetPoint(1);
point.z = player.transform.position.z;
var direction = (point - player.transform.position).normalized;
Debug.DrawRay(player.transform.position, direction*distance);
var enemy = Physics2D.Raycast(player.transform.position, direction, distance, enemyLayer.value);
if (enemy)
{
Debug.Log("Detected..");
}
}

How to interact with objects with ARFoundation?

So the idea is to have a plane and grid placement system in augmented reality with the ability to place and move characters on grids. I already have an example for a mobile device, I have a script that generates grid and a script that allows me to place objects and it works just fine, however, I can't figure out how to use all of the above and if it's possible in AR. For example, I want to detect a plane then instantiate a level and put some objects on it.
Here's the script that is attached to the GridManager and is used to make a grid:
[SerializeField] private float size = 0.05f;
public Vector3 GetNearestPointOnGrid(Vector3 position)
{
position -= transform.position;
int xCount = Mathf.RoundToInt(position.x / size);
int yCount = Mathf.RoundToInt(position.y / size);
int zCount = Mathf.RoundToInt(position.z / size);
Vector3 result = new Vector3(
(float)xCount * size,
(float)yCount * size,
(float)zCount * size);
result += transform.position;
return result;
}
private void OnDrawGizmos()
{
Gizmos.color = Color.yellow;
for (float x = 0; x < 40; x += size)
{
for (float z = 0; z < 40; z += size)
{
var point = GetNearestPointOnGrid(new Vector3(x, 0f, z));
Gizmos.DrawSphere(point, 0.01f);
}
}
}
and here's the one that's attached to the PlacerManager and used to place objects on the grid:
private Grid grid;
private void Awake()
{
grid = FindObjectOfType<Grid>();
}
private void Update()
{
if (Input.GetMouseButtonDown(0))
{
RaycastHit hitInfo;
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
if (Physics.Raycast(ray, out hitInfo))
{
PlaceCubeNear(hitInfo.point);
}
}
}
private void PlaceCubeNear(Vector3 clickPoint)
{
var finalPosition = grid.GetNearestPointOnGrid(clickPoint);
GameObject.CreatePrimitive(PrimitiveType.Cube).transform.position = finalPosition;
}

You can use the raycast options to identify different objects

Raycasting and/or colliders are the way to go.
The sample scene in AR Foundation has a script called PlaceOnPlane.cs that shows how you can detect when a user touches the screen. E.g:
if (Input.touchCount == 1) {
if (m_RaycastManager.Raycast(Input.GetTouch(0).position, s_Hits, TrackableType.PlaneWithinPolygon))
{
// Raycast hits are sorted by distance, so the first one
// will be the closest hit.
var hitPose = s_Hits[0].pose;
if (spawnedObject == null)
{
spawnedObject = Instantiate(m_PlacedPrefab, hitPose.position, hitPose.rotation);
}
}
}
This allows you to get the screen touch position and then raycast from it to the real world scene. In this example, a game object is instantiated in that location. For your case, you can instantiated a level if your hit a plane or a plane exist around the hit position.

Unity2D: Enemy doesn't follow Player when in its radius

Hey Guys I've been having a problem lately that I cant seem to solve.
A sprite is supposed to roam around (as it does) while nothing is inside its radius, however if the player moves close to it the sprite should theoretically move towards it and stop roaming.
The sprite doesn't follow the player and cant even see its tag since I cant even see the contents of the "Collider2D[] hits".
using System.Collections.Generic;
using UnityEngine;
public class FireCultist : MonoBehaviour
{
public float moveTimeSeconds; //Time it will take object to move, in seconds.
private float xMax = 10.0f; // The boundaries of the spawn area
private float yMax = 10.0f;
private float xMin = -10.0f; // The boundaries of the spawn area
private float yMin = -10.0f;
public int xDistanceRange; // The max distance you can move at one time
public int yDistanceRange;
private BoxCollider2D boxCollider; //The BoxCollider2D component attached to this object.
private Rigidbody2D rb2D; //The Rigidbody2D component attached to this object.
private float inverseMoveTime; //Used to make movement more efficient.
public Vector2 start;
public Vector2 end;
public bool roam = true;
public Collider2D[] hits;
void Start()
{
boxCollider = GetComponent<BoxCollider2D>();
rb2D = GetComponent<Rigidbody2D>();
inverseMoveTime = 1f / moveTimeSeconds;
InvokeRepeating("RandomMove", 0.0f, 5.0f);
}
void Update()
{
Collider2D[] hits = Physics2D.OverlapCircleAll(transform.position, 10); // returns all colliders within radius of enemy
int i = 0;
while(hits.Length > i)
{
Debug.Log("Sees");
Debug.Log(hits[i]);
i++;
}
followPlayer();
if (roam)
{
Debug.Log("Roam");
transform.position = Vector2.MoveTowards(transform.position, end, inverseMoveTime * Time.deltaTime); //Random move to new position
}
}
public void followPlayer()
{
foreach (Collider2D hit in hits)
{
if (hit.tag == "Player") // if the player is within a radius
{
Debug.Log("Chasing Player");
transform.position = Vector2.MoveTowards(transform.position, GameObject.Find("Prefabs/Player").GetComponent<Transform>().position, inverseMoveTime * Time.deltaTime); // chase player
roam = false;
}
else
{
Debug.Log("Continues");
roam = true; // Continue RandomMove()
}
}
}
public void RandomMove() // gets random coordinates near enemy and moves there
{
float xDistance = Random.Range(-xDistanceRange, xDistanceRange); // check
float yDistance = Random.Range(-yDistanceRange, yDistanceRange);// check
if (xDistance < xMax && xDistance > xMin && yDistance < yMax && yDistance > yMin && roam == true) // If within boundaries of walking space
{
start = transform.position;
end = start + new Vector2(xDistance, yDistance);
Debug.Log("Roaming From : " + start + " To : " + end);
}
}
}
The roaming algorithm works however not too sure about the tag detection.
The script belongs to this enemy object
Player Object Properties

It looks like you are declaring a new hits variable during every update instead of using your class-level variable. This means the variable inside of followPlayer() will never be instantiated, and the information will not be passed between the two methods.
Try this:
void Update()
{
hits = Physics2D.OverlapCircleAll(transform.position, 10);
//...
}
You might also consider attaching a trigger collider to the enemy which sends a notification when the player enters/exits the trigger instead of relying on OverlapCircleAll()
void OnTriggerEnter2D(Collider2D col)
{
if(col.gameObject.tag == "Player"){
roam = false;
}
}
void OnTriggerExit2D(Collider2D col)
{
if(col.gameObject.tag == "Player"){
roam = true;
}
}

Unity 2017.3: transform.position assign attempt is not valid. Input position is { -infinity, 0,0 }

I've been trying to build a raycast controller for a 2D game, and have followed some tutorial series to help me better understand how this is done. So far everything has been going well, and I've actually followed several tutorials on this topic to completion without issue.
However, while using this current character controller I am getting a slew of errors on play, even with no compiler errors present. I have never seen this error, and have not been able to find a solution online about how to fix it. Basically my character disappears on play (I assume its being moved infinitely to the left).
I get two errors: "transform.position assign attempt is not valid. Input position is { -infinity, 0,0 }," and "Invalid world AABB. Object is too large or too far away from origin."
The error occurs on lines 90:
public void LateUpdate()
{
Move(Velocity * Time.deltaTime);
}
and 126:
characterTransform.Translate(deltaMovement, Space.World);
I have tried a bunch of different things, including changing my character's scale, changing Vector2s to Vector3s, removing Space.World, and calling transform.Translate directly (as opposed to using my characterTransform). Nothing seems to work, and for some reason my camera gives me an error sometimes too, though it is hard to reproduce. If I remove either line of code I get no errors, but obviously my character cannot move.
Screenshot of the errors: https://imgur.com/a/24KIN
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
/// <summary>
/// Handles the character movement with raycasts
/// </summary>
public class CharacterController2D : MonoBehaviour {
//Defines the number of rays
private const int totalHorizontalRays = 8;
private const int totalVeritcalRays = 4;
private RaycastOrigins raycastOrigins; //References the RayCastOrigins struct
private const float skinWidth = .02f; //Defines the skin width of the rays, which places the origin point of the rays slightly inside the character's box collider
private static readonly float slopeLimitTanget = Mathf.Tan(75f * Mathf.Deg2Rad);
public LayerMask platformMask; //Defines the layermask that will be used to determine how different layers interact with the character
public ControllerParameters2D defaultParameters; //References the ControllerParameters2D class
public ControllerState2D State { get; private set; } //References the ControllerState2D class
public ControllerParameters2D Parameters { get { return overrideParameters ?? defaultParameters; } } //Returns updated parameters, or default parameters if overrideParameters is null
public Vector2 Velocity { get { return velocity; } } //Defines the character's velocity
public bool CanJump { get { return false; } } //Defines whether or not the character can jump
public bool HandleCollisions { get; set; } //Defines whether or not the character needs to handle collisions (because it is colliding with something)
private Vector2 velocity; //The field for the Velocity property
private BoxCollider2D boxCollider; //References the box collider on the character
private ControllerParameters2D overrideParameters; //References the updated parameters (that is, the updated parameters, not the default ones)
private Transform characterTransform; //References the character's transform
private Vector3 localScale; //References the character's scale
//The distance between raycasts
private float horizontalDistanceBetweenRays;
private float verticalDistanceBetweenRays;
private struct RaycastOrigins //Stores the value types that define where the raycasts are created on the box collider
{
public Vector2 topLeft, topRight; //Creates variables to define the upper position of the raycasts
public Vector2 bottomLeft, bottomRight; //Creates variables to define the lower position of the raycasts
}
public void Awake()
{
State = new ControllerState2D(); //Accesses the ControllerState2D script
boxCollider = GetComponent<BoxCollider2D>(); //Accesses the character's box collider
characterTransform = transform; //Accesses the character's transform
localScale = transform.localScale; //Accesses the character's scale
//Gets the ray spacing
horizontalDistanceBetweenRays = CalculateHorizontalRaySpacing();
verticalDistanceBetweenRays = CalculateVerticalRaySpacing();
}
public void Start()
{
}
public void AddForce(Vector2 force)
{
velocity += force;
}
public void SetForce(Vector2 force)
{
velocity = force;
}
public void SetHorizontalForce(float x)
{
velocity.x = x;
}
public void SetVerticalForce(float y)
{
velocity.y = y;
}
public void Jump()
{
}
public void LateUpdate()
{
Move(Velocity * Time.deltaTime); //Moves the character per its velocity, scaled by time
}
public void OnTriggerEnter2D(Collider2D other)
{
}
public void OnTriggerExit2D(Collider2D other)
{
}
private void Move(Vector2 deltaMovement)
{
var wasGrounded = State.IsCollidingBelow; //Keeps track of whether or not the character is grounded
State.Reset(); //Resets the state
if (HandleCollisions) //If the character should handle collisions
{
HandlePlatforms();
CalculateRaycastOrigins();
if (deltaMovement.y < 0 && wasGrounded) //If the character is moving down, and was previously grounded...
{
ClimbDownSlope(ref deltaMovement);
}
if (Mathf.Abs(deltaMovement.x) > .001f) //If the character is moving left or right...
{
MoveHorizontally(ref deltaMovement);
}
MoveVertically(ref deltaMovement); //Calls the MoveVertically method always, since the character always has the force of gravity enacted on it
}
characterTransform.Translate(deltaMovement, Space.World); //Moves the character after all potential movement scenarios have been accounted for
if (Time.deltaTime > 0)
{
velocity = deltaMovement / Time.deltaTime; //Sets the current velocity equal to the change in movement
}
//Clamps the velocity to the maximum x and y velocity defined in Parameters
velocity.x = Mathf.Min(velocity.x, Parameters.maxVelocity.x);
velocity.y = Mathf.Min(velocity.y, Parameters.maxVelocity.y);
if (State.IsMovingUpSlope) //If the character is moving up a slope...
{
velocity.y = 0;
}
}
private void MoveHorizontally(ref Vector2 deltaMovement)
{
var isGoingRight = deltaMovement.x > 0; //Defines if the character is going right
var rayDistance = Mathf.Abs(deltaMovement.x) + skinWidth; //Defines the distance of the raycasts
var rayDirection = isGoingRight ? Vector2.right : -Vector2.right; //Defines in which direction the rays will shoot, depdending on character direction
var rayOrigin = isGoingRight ? raycastOrigins.bottomRight : raycastOrigins.bottomLeft; //Defines the current ray origin
for (var i = 0; i < totalHorizontalRays; i++) //Loops through each of the 8 horizontal rays
{
var rayVector = new Vector2(rayOrigin.x, rayOrigin.y + (i * verticalDistanceBetweenRays)); //Builds the rays (stacking them up with each ray that is added)
Debug.DrawRay(rayVector, rayDirection * rayDistance, Color.red);
var rayCastHit = Physics2D.Raycast(rayVector, rayDirection, rayDistance, platformMask); //Actually draws the rays
if (!rayCastHit) //If the raycast hits something... (rayCastHit is true)
{
continue;
}
if (i == 0 && ClimbUpSlope(ref deltaMovement, Vector2.Angle(rayCastHit.normal, Vector2.up), isGoingRight)) //If the character is now climbing a slope...
{
break;
}
deltaMovement.x = rayCastHit.point.x - rayVector.x; //Clamps horizontal movement based on ray collision
rayDistance = Mathf.Abs(deltaMovement.x); //Clamps the ray distance based on how far the character is allowed to move (i.e. ensures the rays end at walls)
if (isGoingRight) //If the character is going right...
{
deltaMovement.x -= skinWidth; //Ensures that the character moves with the correct value (otherwise would be able to move slightly more based on skinWidth value)
State.IsCollidingRight = true;
}
else //If the character is going left...
{
deltaMovement.x += skinWidth;
State.IsCollidingLeft = true;
}
if (rayDistance < skinWidth + .0001f) //If a collision gets bugged for some reason...
{
break;
}
}
}
private void MoveVertically(ref Vector2 deltaMovement)
{
}
private void ClimbDownSlope(ref Vector2 deltaMovement)
{
}
private bool ClimbUpSlope(ref Vector2 deltaMovement, float angle, bool isGoingRight)
{
return false;
}
private void HandlePlatforms()
{
}
private float CalculateHorizontalRaySpacing()
{
Bounds bounds = boxCollider.bounds; //Sets the 'bounds' variable equal to the bounds of the box collider on the game object
bounds.Expand(skinWidth * -2); //Enforces the skinWidth variable
return bounds.size.y / (totalHorizontalRays - 1); //Ensures that all rays are spaced evenly on the sides of the box collider
}
private float CalculateVerticalRaySpacing()
{
Bounds bounds = boxCollider.bounds; //Sets the 'bounds' variable equal to the bounds of the box collider on the game object
bounds.Expand(skinWidth * -2); //Enforces the skinWidth variable
return bounds.size.x / (totalVeritcalRays - 1); //Ensures that all rays are spaced evenly on the bottom and top of the box collider
}
private void CalculateRaycastOrigins()
{
Bounds bounds = boxCollider.bounds; //Sets the 'bounds' variable equal to the bounds of the box collider on the game object
bounds.Expand(skinWidth * -2); //Enforces the skinWidth variable
//Creates the starting positions of the raycasts
raycastOrigins.bottomLeft = new Vector2(bounds.min.x, bounds.min.y);
raycastOrigins.bottomRight = new Vector2(bounds.max.x, bounds.min.y);
raycastOrigins.topLeft = new Vector2(bounds.min.x, bounds.max.y);
raycastOrigins.topRight = new Vector2(bounds.max.x, bounds.max.y);
}
}

After doing some research, it seems this is a bug that can sometimes occur.
Not sure why I didn't try this sooner, but reinstalling Unity fixed all the issues...