I have the following Bird, I want when the player touch a point on a screen to apply velocity on the Bird and move it to that point.
So I wrote the following:
if (Input.touches.Length > 0)
{
foreach(Touch touch in Input.touches ){
Vector2 pos = touch.deltaPosition;
rigidbody2D.velocity = pos;
}
}
The problem is that this is executed only when there is something like a move of a finger on the screen and not something like a hit or tap. Any idea how can I achieve what I want?
In this case you should not modify the velocity directly. This can result in unrealistic behavior. I would recommend you to use rigidbody.AddForce( direction : Vector3 ). Add your functionality inside an Update Loop and use a break; to leave the foreach if you want that the force is added only once and not for every single finger on the display.
Related
I want to make sure that various objects moving at high speed cannot pass through walls or other objects. My thought process was to check via Raycast if a collision has occurred between two moments of movement.
So the script should remember the previous position and check via Raycast for collisions between previous and current position.
If a collision has occurred, the object should be positioned at the meeting point and moved slightly in the direction of the previous position.
My problem is that works outside the map not inside. If I go from inside to outside, I can go through the walls. From outside to inside not.
Obviously I have misunderstood something regarding the application with raycasts.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ObsticalControll : MonoBehaviour
{
private Vector3 positionBefore;
public LayerMask collisionLayer = 9;
private Vector3 lastHit = new Vector3(0, 0, -20);
// Start is called before the first frame update
void Start()
{
positionBefore = transform.position;
}
private void OnDrawGizmos()
{
Gizmos.DrawCube(lastHit, new Vector3(.2f,.2f,.2f));
}
// Update is called once per frame
void Update()
{
Vector3 curruentMovement = transform.position;
Vector2 dVector = (Vector2)transform.position - (Vector2)positionBefore;
float distance = Vector2.Distance((Vector2)positionBefore, (Vector2)curruentMovement);
RaycastHit2D[] hits = Physics2D.RaycastAll((Vector2)positionBefore, dVector, distance, collisionLayer);
if(hits.Length > 0)
{
Debug.Log(hits.Length);
for (int i = hits.Length -1 ; i >= 0 ; i--)
{
RaycastHit2D hit = hits[i];
if (hit.collider != null)
{
Debug.Log("hit");
lastHit.x = hit.point.x;
lastHit.y = hit.point.y;
Vector3 resetPos = new Vector3(hit.point.x, hit.point.y, transform.position.z) + positionBefore.normalized * 0.1f;
transform.position = new Vector3(resetPos.x, resetPos.y, transform.position.z);
}
}
}
positionBefore = transform.position;
}
}
Theres a better way to deal with this that unity has built in.
Assuming the object thats moving at a high speed has a RigidBody(2d in your case) you can set its Collision Detection to Continuous instead of Discrete.
This will help collisions with high speed collision, assuming that its moving at high speed and the wall is not moving.
If for some reason you cannot apply this to your scenario, Ill try to help with the raycast solution.
However, I am still wondering about the collision behavior of my raycast script. That would be surely interesting, if you want to calculate shots or similar via raycast
Alright, so your initial idea was to check if a collision had occurred, By checking its current position and its previous position. And checking if anything is between them, that means a collision has occurred. And you would teleport it back to where it was suppose to have hit.
A better way todo this would be to check where the GameObject would be in the next frame, by raycasting ahead of it, by the distance that it will travel. If it does hit something that means that within the next frame, it would have collided with it. So you could stop it at the collision hit point, and get what it has hit. (This means you wouldn't have to teleport it back, So there wouldn't be a frame where it goes through then goes back)
Almost the same idea but slightly less complicated.
Problem would be that if another object were to appear between them within the next frame aswell, it could not account for that. Which is where the rigidbody.movePosition shines, And with OnCollisionEnter you can detect when and what it collided with correctly. Aswell as without the need to teleport it back
First that is a 2D game.I made a rotating water mill. When I put my character on top of that. Character does not rotate like it should. It does not turn with water mill and trying to save its position. How can I fix it?
I tried to add Physic materials and some effectors.
////Thats movement code
void FixedUpdate()
{
if( (Input.GetKeyDown(KeyCode.W) || Input.GetKeyDown(KeyCode.UpArrow)) && OnPlatform )
{
OnPlatform = false;
rb.velocity = Vector2.up * JumpForce;
}
float move = Input.GetAxisRaw("Horizontal") * MovementSpeed;
if( canWalk && move != 0 )
{
rb.velocity = new Vector2(move,rb.velocity.y);
}
}
I want my rotating surface and player rotate normal like in real world.
One solution would be to make the player a child object of the water mill while he stands on it. But that he then no longer is a child object of it when not standing on it.
Child objects get affected by their parents rotation, scaling and position. So this would rotate the player.
Just use the transform.SetParent(watermillTransform) method on the players transform. Set it to null when he needs to have no parent.
I've created an arm with a custom pivot in Unity which is essentially supposed to point wherever the mouse is pointing, regardless of the orientation of the player. Now, this arm looks weird when pointed to the side opposite the one it was drawn at, so I use SpriteRenderer.flipY = true to flip the sprite and make it look normal. I also have a weapon at the end of the arm, which is mostly fine as well. Now the problem is that I have a "FirePoint" at the end of the barrel of the weapon, and when the sprite gets flipped the position of it doesn't change, which affects particles and shooting position. Essentially, all that has to happen is that the Y position of the FirePoint needs to become negative, but Unity seems to think that I want the position change to be global, whereas I just want it to be local so that it can work with whatever rotation the arm is at. I've attempted this:
if (rotZ > 40 || rotZ < -40) {
rend.flipY = true;
firePoint.position = new Vector3(firePoint.position.x, firePoint.position.y * -1, firePoint.position.z);
} else {
rend.flipY = false;
firePoint.position = new Vector3(firePoint.position.x, firePoint.position.y * -1, firePoint.position.z);
}
But this works on a global basis rather than the local one that I need. Any help would be much appreciated, and I hope that I've provided enough information for this to reach a conclusive result. Please notify me should you need anything more. Thank you in advance, and have a nice day!
You can use RotateAround() to get desired behaviour instead of flipping stuff around. Here is sample code:
public class ExampleClass : MonoBehaviour
{
public Transform pivotTransform; // need to assign in inspector
void Update()
{
transform.RotateAround(pivotTransform.position, Vector3.up, 20 * Time.deltaTime);
}
}
I have just started unity. I have 4 Images(sprites) aligned in a grid. Now i want to move an image to a target position as soon as I touch the image. How can i do that?
I wrote the following code for move:
void Update () {
float step=speed*Time.deltaTime;
transform.position=Vector3.MoveTowards(transform.position,target.position,step);
}
I just don't know to move that particular sprite on which I touch.
Thanks
From http://answers.unity3d.com/questions/420808/how-to-get-position-of-touch-on-touch-screen.html
fingerPos = Input.GetTouch(0).position;
Vector3 pos = fingerPos;
pos.z = transform.position.z;
// simplified check
if (transform.position == Camera.main.ScreenToWorldPoint(pos))
{
// move towards the target as you want
}
Notice that i kept it brief with that if, but, of course, you should check if the touch position is withing the boundaries of your object.
updated CODE .. the problem is that i cant move the ball only if i hold the E button than i use WASD or arrows to move the ball...and when i hold Q the camera 2 activates and i can move the ball with WASD or arrows...but with the right axis for that angle...is like ballance that game... i want to not hold the E or Q just to change the camera and move the ball corecctly for that angle with the right axis for the ball but not holding the cameras button
using UnityEngine;
using System.Collections;
public class controlPlayer : MonoBehaviour {
public float viteza ; // this is speed
;
void Start(){
}
void Update()
{
if(Input.GetKey(KeyCode.Q) ) // if i hold Q the camera 2 activates and with WASD i can move the ball
{
float miscaOrizontal = Input.GetAxis("Horizontal");
float miscaVertical = Input.GetAxis("Vertical");
Vector3 miscare = new Vector3(miscaVertical,0.0f,(-miscaOrizontal)); //also here i chande the axis for the camera 2
rigidbody.AddForce(miscare * viteza * Time.deltaTime);
}
if(Input.GetKey(KeyCode.E) ) // here when i press E the camera 1 activates and alos i can move the ball if i keep pressing E
{ float miscaOrizontal2 = Input.GetAxis("Horizontal");
float miscaVertical2 = Input.GetAxis("Vertical");
Vector3 miscare2 = new Vector3(miscaOrizontal2,0.0f,miscaVertical2); // here are the controls for the ball for the camera ..i had to change the axis here..
rigidbody.AddForce(miscare2 * viteza * Time.deltaTime);
}
}
}
}
Alright, so if I'm understanding you correctly, you want the ball to move in relation to which direction the camera is currently facing. As well as you don't want to have to hold down "Q" or "E" while you move your ball with WASD controls.
So there are a few things that I'd like to mention here, so we'll take them one at a time. First off, you shouldn't have "AddForce" inside of an Update call. Update is called every frame whenever it can. It's great for input, but generally you want to call it in "FixedUpdate" instead. It provides a better response across many devices. If you leave it in update, you can get inaccurate physics results, and missed collisions. There's a lot out there on this subject, so if you want to know more about it, then just google for a little while.
As for the code side, you want to store a reference to what camera you're using to avoid having to hold these buttons down.
What I mean is:
private Camera referencedCamera = null;
private void Start()
{
referencedCamera = camera1;
}
private void Update()
{
if(Input.GetKey(KeyCode.Q)) referencedCamera = camera2;
else if(Input.GetKey(KeyCode.E)) refrencedCamera = camera1;
}
This way you can reference which camera is being used, rather than a key input. Something else to look into is the "State Design Pattern". Below is a video over the "State Design Pattern." That is a great video tutorial series that Derek Banas put up on design patterns, extremely recommend watching them, but the state pattern could potentially solve this problem for you as well. So that should take care of not having to hold the button down in order to make the move. More or less, the buttons will now allow you to just switch which camera is currently being used.
https://www.youtube.com/watch?v=MGEx35FjBuo
So now that that is solved, you want to transform the input that you currently have, and you want to put it in terms of hte camera that is currently being used. So to avoid rewriting a lot of the code over and over again, just know that these two code snippets should be pieced together into one. So "referencedCamera" should be already defined in the code I'm about to write:
private void FixedUpdate()
{
if(referencedCamera != null)
{
float miscaOrizontal = Input.GetAxis("Horizontal");
float miscaVertical = Input.GetAxis("Vertical");
Vector3 miscare = referencedCamera.transform.TransformDirection(
new Vector3(miscaVertical, 0.0f, -miscaOrizontal));
rigidbody.AddForce(miscare * viteza * Time.deltaTime);
}
}
So now with this, is it's the same code, but there is a call to the referenced cameras transform to take the vector 3 from the input and put it in relation to the camera instead, and add the new relational vector to the object.
I also want to recommend you looking into events rather than if checks in the update function, but that is beyond the scope of the question. Hope this helps and any questions, don't hesitate to ask.
EDIT
After further discussion, we came across something that should also be mentioned. If your camera that you are referencing is angled, the force will be applied in that angle, so keep that in mind. If it is pointed towards an object downward, then forward relative to the camera will apply a force downward, and not entirely in what you may consider the forward direction. Thought it was worth mentioning.