I'm trying to create a vision field in Unity 2d. I'm projecting raycasts from a rotating gameobject which rotates according to where the character is looking. However this character moves back and forth so when they are moving left I set the transform.scale to -1. The problem is when I do this the raycasts don't change direction along with the character and stay pointing right! Here is the code, I'm probably missing something obvious! Any help would be appreciated!
Transform parent;
float vision_angle_ = 50;
float direction;
Vector3 angle;
Vector2 position;
Quaternion q;
int x = 10;
void Start ()
{
parent = transform.parent;
}
void Update ()
{
direction = parent.GetComponent<Behaviour>().direction;
angle = new Vector2 (x, Mathf.Tan ((vision_angle_) * .5f * Mathf.Deg2Rad) * x);
q = Quaternion.AngleAxis (1, -transform.forward);
position = new Vector2 (transform.position.x, transform.position.y);
for (float i = 0; i < 50; i++) {
angle = q * angle;
RaycastHit2D tile_hit = Physics2D.Raycast (position, transform.TransformDirection (angle), 10);
Debug.DrawRay (position, transform.TransformDirection (angle), Color.green);
}
}
TransformDirection doesn't take the scale of your transform into account. You can adjust to compensate:
Vector2 direction = transform.TransformDirection(angle);
if (transform.localScale.x < 0f) {
direction.x = -direction.x;
}
RaycastHit2D tile_hit = Physics2D.Raycast(position, direction, 10);
Related
i want to rotate a cube around a 1x1 pipe with arrow keys. (left and right).
The problem is i cannot use built-in functions which sets transform's position and location directly. (Such as transform.lookAt, transform.Rotate or transform.RotateAround). Because I need the vector values of rotation's euler and position for multiple stuff before i modify the value of the transform i want to rotate.
I tried different techniques but no luck so far.
I tried using sin-cos for rotating but could not figure out how to make it work for both rotation and position.
_timer += Time.deltaTime * _larvaSpeed;
float x = -Mathf.Cos(_timer) * distanceBetweenCenter;
float y = Mathf.Sin(_timer) * distanceBetweenCenter;
Here is what i want to achieve. By pressing right or left, move and rotate the object around the pipe.
The result i want. (If i pressed right arrow key a litte bit).
I would appreciate any help. Thank you!
here is the solution using circle mathematics and I strongly recommended not use it, it's just to understand the circular move using circle equation as #FaTaLL ask in the comments
Circle equation...
(x1 - x2)^2 + (y1 - y2)^2 = r^2
x1, y1 is the cube position
x2, y2 is the pipe position
r is the distance between cube and pipe;
using UnityEngine;
public class Rotating : MonoBehaviour
{
public GameObject pipe;
public float Delta;
Vector3 nextpos;
bool compareY;
bool next;
int switchx;
float storeVarAxis;
float x, y, r;
private void Start()
{
next = true;
switchx = 1;
compareY = true;
x = transform.position.x - pipe.transform.position.x;
y = transform.position.y - pipe.transform.position.y;
storeVarAxis = y;
r = Mathf.Sqrt(x * x + y * y);
}
private void Update()
{
if (next)
{
if (compareY == true)
{
y -= Delta * Time.deltaTime;
if (y <= -storeVarAxis)
{
y = -storeVarAxis;
compareY = false;
switchx = -1;
}
}
else
{
y += Delta * Time.deltaTime;
if (y >= storeVarAxis)
{
y = storeVarAxis;
compareY = true;
switchx = 1;
}
}
float v = r * r - y * y;
x = Mathf.Sqrt(Mathf.Abs(v));
nextpos = new Vector3(pipe.transform.position.x + x * switchx, pipe.transform.position.y + y, transform.position.z);
next = false;
}
transform.position = Vector3.MoveTowards(transform.position, nextpos, 1f * Time.deltaTime);
if(Vector3.Distance(transform.position, nextpos) < .05) transform.position = nextpos;
if (transform.position.x.Equals(nextpos.x) && transform.position.y.Equals(nextpos.y)) next = true;
}
}
well, the recommended way is using this simple script
using UnityEngine;
public class Rotating : MonoBehaviour
{
public float speed;
public GameObject pipe;
float r, angle;
Vector3 startpos;
private void Start()
{
r = Mathf.Abs(transform.position.y - pipe.transform.position.y);
angle = 0;
transform.position = pipe.transform.position;
startpos = transform.position;
}
void Update()
{
angle = angle + speed * Time.deltaTime;
transform.rotation = Quaternion.EulerAngles(0,0, angle);
transform.position = startpos + (transform.rotation * new Vector3(r, 0, 0));
}
}
I think Quaternion * Vector3 is what you are looking for. Luckily the box's rotation in its own local coordinates is the same rotation you need to apply to the box's position.
public float speed; //how fast to rotate
public float radius; //radius of the cylinder
public float angle; //angle around it
void Update()
{
if (Input.GetKey(KeyCode.LeftArrow))
{
angle = angle + speed * Time.deltaTime;
}
if (Input.GetKey(KeyCode.RightArrow))
{
angle = angle - speed * Time.deltaTime;
}
//figure out the rotation (from euler angles i guess??)
var quat = Quaternion.EulerAngles(new Vector3(0, angle, 0));
//ok uh what is the box position?? lets just multiply
var unrotated_position = new Vector3(radius, 0, 0);
var rotated_position = quat * unrotated_position;
this.transform.position = rotated_position;
//oh yea and also rotate the box in its own local coordinates
this.transform.rotation = quat;
}
i am trying to rotate its x and z axis to the mouse position while not changing the y. for some reason the y keeps changing!!!
my current code looks like this
public float moveSpeed = 5;
public float maxMoveSpeed = 15;
CharacterController body;
// Start is called before the first frame update
void Start()
{
body = GetComponent<CharacterController>();
}
// Update is called once per frame
void Update()
{
RaycastHit hit;
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
if (Physics.Raycast(ray, out hit))
{
Vector3 point = new Vector3(hit.point.x, 0, hit.point.z);
print(point);
transform.LookAt(point);
}
float h = Input.GetAxis("Horizontal");
float v = Input.GetAxis("Vertical");
Vector3 moveDis = transform.forward * v * moveSpeed;
moveDis += transform.right * h * moveSpeed;
body.SimpleMove(moveDis);
}
for some reason if i remove the player controller it works fine!
i am trying to rotate its x and z axis
No you are not ^^
What you are doing is
Vector3 point = new Vector3(hit.point.x, 0, hit.point.z);
transform.LookAt(point);
where LookAt
Rotates the transform so the forward vector points at /target/'s current position.
which in most cases will rotate your object around the X and Y axis!
It is unclear what your actual goal would be in order to provide a possible solution to that, though.
I want to use moverotation to rotate the object in the direction of the Main Camera, like a common third person shooter, but I don't know how to set the quaternion values or otherwise
`using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class movimento : MonoBehaviour
{
[SerializeField] float walk = 1;
[SerializeField] float run = 2;
Vector3 movement = Vector3.zero;
private Rigidbody rig;
// Start is called before the first frame update
void Start()
{
rig = GetComponent<Rigidbody>();
}
// Update is called once per frame
void Update()
{
if (Input.GetKeyDown(KeyCode.LeftShift)) walk = (walk + run);
if (Input.GetKeyUp(KeyCode.LeftShift)) walk = (walk - run);
float Horizontal = Input.GetAxis("Horizontal");.
float Vertical = Input.GetAxis("Vertical");
movement = Camera.main.transform.forward * Vertical + Camera.main.transform.right * Horizontal;
float origMagnitude = movement.magnitude;
movement.y = 0f;
movement = movement.normalized * origMagnitude;
}
private void FixedUpdate ()
{
rig.MovePosition(rig.position + movement * walk * Time.fixedDeltaTime);
Quaternion rotation = Quaternion.Euler(???);
rig.MoveRotation(rig.rotation * rotation);
}
}`
i use a coroutine to do smooth rotation. I use Quaternion.LookRotation for the job.
so you indicate the position of object to look at and the duration of animation. Here you want to rotate face to the main camera
StartCoroutine(SmoothRotation(Camera.main.transform, 3f));
:
:
IEnumerator SmoothRotation(Transform target, float duration)
{
float currentDelta = 0;
var startrotation = transform.rotation;//use your rigisbody if you want here i use the gameobject
var LookPos = target.position - transform.position;
var finalrot = Quaternion.LookRotation(LookPos);
while (currentDelta <= 1f)
{
currentDelta += Time.deltaTime / duration;
transform.rotation = Quaternion.Lerp(startrotation, finalrot, currentDelta);//
yield return null;
}
transform.rotation = finalrot;
}
if you want to see (in scene when running) where your camera points just add this line of code in update():
Debug.DrawRay(Camera.main.transform.position, Camera.main.transform.TransformDirection(Vector3.forward) * 10f, Color.black);
if you want to point in same direction tha nthe Camera just change the line of finalrot in SmoothRotation Method:
var finalrot = Camera.main.transform.rotation;
you dont need to calculate the LookPos
for your problem of crazy rotation, i suggest you to reset rotation x and z
direction = hit.transform.position - transform.position;
Quaternion rotation = Quaternion.LookRotation(direction);
rotation.x = 0f;
rotation.z = 0f;
a tips to detect object what you want with the raycast inside spere : Physics.OverlapSphere: you could select what you want to cast when using the optional parameter layermask
private void DetectEnemy(Vector3 center, float radius)
{
var hitColliders = Physics.OverlapSphere(center, radius );
for (var i = 0; i < hitColliders.Length; i++)
{
print(hitColliders[i].name + "," + hitColliders[i].transform.position);
// collect information on the hits here
}
}
I created a raycast from the camera, and I would like to rotate the rigidbody to where the raycast is pointing but if i launch unity, it rotated wildly. What is the error?
Vector3 direction;
Vector3 rayDir = new Vector3(Screen.width/2,Screen.height/2);
void Update()
Ray ray = Camera.main.ScreenPointToRay(rayDir);
Debug.DrawRay(ray.origin, ray.direction * 10, Color.yellow);
RaycastHit hit = new RaycastHit ();
direction = hit.point - transform.position;
private void FixedUpdate ()
Quaternion rotation = Quaternion.LookRotation(direction);
rig.MoveRotation(rig.rotation * rotation);
Add a character controller component, this is what is for. See:
https://docs.unity3d.com/Manual/class-CharacterController.html
I started a FPS project. I have a capsule as a Player, an empty GO as the head and the camera is the child object of the head.
On the vertical Axis, I clamp my y-rotation to -70 (min) and 70 (max). Surprisingly the value does not get clamped.
[SerializeField]
private Transform playerHead;
float inputHorizontal;
float inputVertical;
float sensitivity = 50;
float yMin = -70;
float yMax = 70;
Vector2 direction; // movement direction
Transform playerTransform;
void Start()
{
playerTransform = GameObject.FindGameObjectWithTag("Player").transform;
}
private void Update()
{
inputHorizontal = Input.GetAxisRaw("Mouse X");
inputVertical = -Input.GetAxisRaw("Mouse Y"); // Inverted Input!
direction = new Vector2(
inputHorizontal * sensitivity * Time.deltaTime,
Mathf.Clamp(inputVertical * sensitivity * Time.deltaTime, yMin, yMax)); // The horizontal movement and the clamped vertical movement
playerTransform.Rotate(0, direction.x, 0);
playerHead.Rotate(direction.y, 0, 0);
}
The value
direction.y
gets clamped but I can still turn around my head by 360 degrees..
You are clamping your delta rotation - not your actual rotation.
Said in another way, direction is not the final rotation, it is the change in rotation. What you are effectively doing, is limiting the rotation to 70 degrees per frame.
You probably want to limit the actual rotation of playerHead, for example by adding the following lines to the end of update:
Vector3 playerHeadEulerAngles = playerHead.rotation.eulerAngles;
playerHeadEulerAngles.y = Mathf.Clamp(playerHeadEulerAngles.y, yMin, yMax);
playerHead.rotation = Quaternion.Euler(playerHeadEulerAngles);
There is also no reason to create a direction vector, when you are using each component separately anyway.
Clamp the final Y direction value not the current mouse movement -
[SerializeField]
private Transform playerHead;
float inputHorizontal;
float inputVertical;
float sensitivity = 50;
float yMin = -70;
float yMax = 70;
Vector2 direction; // movement direction
float currYDir = 0,prevYDir = 0;
Transform playerTransform;
void Start()
{
playerTransform = GameObject.FindGameObjectWithTag("Player").transform;
}
private void Update()
{
inputHorizontal = Input.GetAxisRaw("Mouse X");
inputVertical = -Input.GetAxisRaw("Mouse Y"); // Inverted Input!
direction = new Vector2(
inputHorizontal * sensitivity * Time.deltaTime,
inputVertical * sensitivity * Time.deltaTime); // The horizontal movement and the clamped vertical movement
playerTransform.Rotate(0, direction.x, 0);
currYDir = prevYDir + direction.y;
currYDir = Mathf.Clamp(currYDir, yMin, yMax);
playerHead.Rotate(currYDir-prevYDir, 0, 0);
prevYDir = currYDir;
}
I'm making a patrol script for a game object. I want the object to rotate smoothly and slowly to face it's patrol target.
Unfortunately, the object snaps to it's new location.
I've asked on unity forums and can't get an answer.
How can I get the rotation to be smooth and slow?
Here's my code.
public Transform[] patrol;
public int Currentpoint;
public float moveSpeed;
public Vector3 john = new Vector3(0,1,0);
public Vector3 targetLocation;
void Start()
{
}
void Update()
{
if (transform.position == patrol [Currentpoint].position) {
Currentpoint++;
if (Currentpoint >= patrol.Length) {
Currentpoint = 0;
}
targetLocation = patrol [Currentpoint].position;
Vector3 targetDir = targetLocation - transform.position;
float angle = Mathf.Atan2 (targetDir.y, targetDir.x) * Mathf.Rad2Deg;
transform.localRotation = Quaternion.SlerpUnclamped (transform.localRotation, Quaternion.AngleAxis (angle, Vector3.forward), Time.deltaTime * 3);
Debug.Log (Currentpoint);
}
transform.position = Vector3.MoveTowards (transform.position, patrol [Currentpoint].position, moveSpeed * Time.deltaTime);
}
public static Quaternion Slerp(Quaternion a, Quaternion b, float t); The parameter t is clamped to the range [0, 1]
your times 3 is throwing it out so it is not between 0-1 ... I believe
If you like some mathematics then I have a solution for you.
You want to rotate object around another, like Earth and Sun. May be some other solutions may available but I would do it through LookAt and parametric equation of circle.
x = r * cos(theta) + displacementX
y = r * sin(theta) + displacementY
where r is radius, distance in your case
displacementX and displacementY are the distance from origin. If both (displacementX and displacementY) is 0 then it will rotate around origin (0,0). In other words displacementX and displacementY is the origin of rotation.
In Object(Earth) script, do it as follow
public Transform _sun;
float _theta = 0;
void Start ()
{
StartCoroutine ("ChangeAngle");
}
void Update ()
{
transform.LookAt (_sun);
float newX = (5 * Mathf.Cos (_theta)) + _sun.position.x;
float newY = (5 * Mathf.Sin (_theta)) + _sun.position.y;
transform.position = new Vector3 (newX, newY, _sun.position.z);
}
IEnumerator ChangeAngle ()
{
while (true) {
yield return new WaitForSeconds (0.01f);
_theta += 0.1f;
if (_theta >= 360)
_theta = 0;
}
}
You can further play with it
I found an answer,
It turns out that placing the rotational instructions within the if statement was the problem. I converted the rotation to a function, then placed the function above the general patrol movement in the same loop segment.
I don't know why it worked.
Thanks to everyone for their help.