We Keep Coding

Multiple touch unity mobile

I am creating a 2d mobile game where one of the scripts uses a joystick to move and the other script lets the player shoot an object when tapping anywhere on the screen. The issue is when using the joystick it also shoots at the same time in that direction. Is there a way to separate the touches so when you use the joystick it does not immediately shoot to that direction but the player can still move and shoot anywhere at the same time?
Move Code
private void Update()
{
Vector2 moveInput = new Vector2(joystick.Horizontal, joystick.Vertical);
moveAmount = moveInput.normalized * speed;
}
Shoot code
private void Update()
{
Vector2 direction = Camera.main.ScreenToWorldPoint(Input.mousePosition) - transform.position;
float angle = Mathf.Atan2(direction.y, direction.x) * Mathf.Rad2Deg;
Quaternion rotation = Quaternion.AngleAxis(angle - 90, Vector3.forward);
transform.rotation = rotation;
if(Input.GetMouseButton(0))
{
if (Time.time >= shotTime)
{
Instantiate(projectile, shotPoint.position, transform.rotation);
shotTime = Time.time + timeBetweenShots;
}
}
}

Instead of using Input.mousePosition you'll have to use Input.GetTouch. You can loop through it using Input.touchCount to find the first touch that is not interacting with a ui element, than use that touch instead of Input.mousePosition to find the direction to shoot (or not shoot if there is no touch). To find out if a specific touch is over ui you need a reference to the scene's EventSystem (or use EventSystem.current), and use EventSystem.IsPointerOverGameObject with Touch.fingerId.
If the joystick is not a ui element you'll need a different way to detect if the touch is over the joystick. For example you could check the pixel position, or see if the joystick itself has an "interacting fingerId". But with the assumption that the joystick is an ui element, here's one way to do what I wrote above: (untested)
private void Update()
{
var eventSystem = EventSystem.current;
for (var i = 0; i<Input.touchCount; i++)
{
var touch = Input.GetTouch(i);
if (eventSystem.IsPointerOverGameObject(touch.fingerId))
{
continue;
}
ShootToScreenPos(Vector2 screenPos);
break;
}
}
private void ShootToScreenPos(Vector2 screenPos)
{
Vector2 direction = Camera.main.ScreenToWorldPoint(screenPos) - transform.position;
float angle = Mathf.Atan2(direction.y, direction.x) * Mathf.Rad2Deg;
Quaternion rotation = Quaternion.AngleAxis(angle - 90, Vector3.forward);
transform.rotation = rotation;
if (Time.time >= shotTime)
{
Instantiate(projectile, shotPoint.position, transform.rotation);
shotTime = Time.time + timeBetweenShots;
}
}

How to smooth out 2D rotation in C#?

I'm making a 2D game in Unity and one feature I'm trying to implement is flipping the player if the mouse position is over 90 meaning he is always facing the direction of the mouse.
Vector3 mousePosition = UtilsClass.GetMouseWorldPosition();
Vector3 aimDirection = (mousePosition - transform.position).normalized;
float angle = Mathf.Atan2(aimDirection.y, aimDirection.x) * Mathf.Rad2Deg;
Vector3 aimLocalScale = Vector3.one;
if (angle > 90 || angle < -90)
{
rotate = true;
}
else
{
rotate = false;
}
gameObject.transform.localScale = aimLocalScale;
if (rotate == true)
{
transform.Rotate(0f, 180f, 0f);
}
else
{
transform.Rotate(0f, 0f, 0f);
}
However, one problem I am having is that one, it's very finicky and if you go too fast the player is looking in the wrong direction, and two, if you look straight up, he doesn't know exactly where to look and keeps snapping left and right really fast.
Does anyone know a way to fix this allowing for a smoother more functional flipping?

Try flipping the sprite by adjusting its scale from 1 to -1. Then implement that into a FlipSprite() method and just call it when you want to flip it

So if you want to flip and sprite one approach could be to inverse the localScale of the sprite, like this:
private void FlipSprite()
{
// Multiply the player's x local scale by -1.
Vector3 flippedScale = transform.localScale;
flippedScale.x *= -1;
transform.localScale = flippedScale;
}
I suggest you to keep a boolean variable like isFacingRight to keep tracking the direction the sprite is looking at!

The issue is you use the same rotate threshold for when the character is facing right and left, so when you straddle the threshold he flips a lot and its bad UX for the player.
Solution : make the rotate threshold dynamic so each time the player rotates the threshold gets pushed down.
float thresholdAngle = 90.0f;
change angle > 90 || angle < -90 to
if (angle > thresholdAngle || angle < -1.0f * thresholdAngle)
Then add in
if (rotate == true)
{
transform.Rotate(0f, 180f, 0f);
thresholdAngle = 110.0f;
}
else
{
transform.Rotate(0f, 0f, 0f);
thresholdAngle = 80.0f;
}
I'm not sure which way your character faces first so you may have to swap the thresholdAngle = 110.0f with the threshold = 80.0f;

Prevent player rotation from changing last second in Unity

Unity using C#
In an top down game where the camera rotation is locked, I have made a character controller which is restricted to 8 axis and will only rotate in 45 degree increments. Think Links awakening. Everything works except when moving in a diagonal direction(using WASD).
When I let go of W & D for example, whichever key I let go of last even if by a fraction of a second, the player will end up facing in that direction rather than the intended up and to the right diagonal direction.
I am looking to modify the following code to add some sort of buffer so that the player remains facing the intended direction when I let go of the 2 keys. I'd like to keep it as simple as possible.
public float defaultSpeed = 6f;
CharacterController controller;
private Vector3 playerMovement;
Vector2 input;
float angle;
Quaternion targetRotation;
Transform cam;
// Start is called before the first frame update
void Start()
{
controller = GetComponent<CharacterController>();
cam = Camera.main.transform;
}
// Update is called once per frame
void Update()
{
Movement();
}
public void Movement()
{
//Get inputs
input.x = Input.GetAxisRaw("Horizontal");
input.y = Input.GetAxisRaw("Vertical");
//Only update if keys are pressed
if (Mathf.Abs(input.x) < deadZone && Mathf.Abs(input.y) < deadZone) return;
//Get camera angle: input to radians - radians to degrees - degrees plus the camera angle - limit angle to 45 degree increments
angle = Mathf.Atan2(input.x, input.y);
angle = Mathf.Rad2Deg * angle;
angle += cam.eulerAngles.y;
angle = Mathf.Round(angle / 45) * 45;
//Rotate Character
targetRotation = Quaternion.Euler(0, angle, 0 );
transform.rotation = targetRotation;
//Move Character
transform.position += transform.forward * defaultSpeed * Time.deltaTime;
}

Make a courotine that checks if a key is released, and waits, say 0.5 seconds for another key to be released. If another key is released, then stay in that direction. Hope it works. Good luck.

Unity enemy ai always firing bullets high over the player

Got an issue where the enemy will fire at the player, but always seems to go high or to the side of the player even when the player is stationary and isn't moving. Am I doing something wrong in my code which creates this wild issue or is it just a random annoying bug?
Using the same script for the player albeit it under a different name works, which leads me to believe the issue lies within the fire point. Under the player's script I fire like so:
// Get the place the player has clicked
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
// Holds information regarding the mouseclick
RaycastHit hitInfo;
// Now work out if we fire or not
if (Physics.Raycast(ray, out hitInfo))
{
if(hitInfo.distance < maxRange)
{
FireAtPoint(hitInfo.point);
Whereas in the enemy script it is just done through the player's position.
// Holds information regarding the mouseclick
RaycastHit hitInfo;
// Now work out if we fire or not
if (Physics.Raycast(player.transform.position,transform.forward, out hitInfo))
{
Is this underlying issue in the Physics.Raycast call then?
Rest of code for reference:
//More above this but doesn't influence the firing
if (Physics.Raycast(player.transform.position,transform.position, out hitInfo))
{
if (hitInfo.distance < maxRange)
{
FireAtPoint(hitInfo.point);
}
}
private void FireAtPoint(Vector3 point)
{
// Get the velocity to fire out at
var velocity = FiringVelocity(point, angle);
Rigidbody rg = Instantiate(bulletPrefab.gameObject, firePoint.position, firePoint.rotation).GetComponent<Rigidbody>();
EnemyBulletController newProjectile = rg.GetComponent<EnemyBulletController>();
newProjectile.speed = velocity;
}
private Vector3 FiringVelocity(Vector3 destination, float angle)
{
// Get the direction of the mouse click from the player, then get the height differential.
Vector3 direction = destination - transform.position;
float height = direction.y;
height = 0;
// Get the distance in a float of the vector3
float distance = direction.magnitude;
// Turn the firing angle into radians for calculations, then work out any height differential
float AngleRadians = angle * Mathf.Deg2Rad;
direction.y = distance * Mathf.Tan(AngleRadians);
distance += height / Mathf.Tan(AngleRadians);
// Calculate the velocity magnitude
float velocity = Mathf.Sqrt(distance * Physics.gravity.magnitude / Mathf.Sin(2 * AngleRadians));
// Return the normalized vector to fire at.
return velocity * direction.normalized;
}
Picture for reference:

Your equation for computing the velocity looks doubtful. Let's re-derive it:
The equations of free-fall motion under constant gravity are:
After rearranging by substituting the first into the second, we find an expression for the firing velocity:
This is different to what you have, as you are missing the h/d term; said term also gives a constraint on the allowed values of θ:
(Basically means that if you fire directly at the target the bullet would never reach due to gravity)
There are many other problems with your code; just to list three:
Why set height to zero?
Why add a correction to distance? The correction has no physical interpretation.
The fix suggested by #BasillePerrnoud
Amended code:
private Vector3 FiringVelocity(Vector3 destination, float angle)
{
Vector3 direction = destination - transform.position;
float height = direction.y;
float distance = Mathf.Sqrt(direction.x * direction.x + direction.z * direction.z); // *horizontal* distance
float radians = angle * Mathf.Deg2Rad;
float hOverd = height / distance;
float tanAngle = Mathf.Tan(radians);
if (tanAngle <= hOverd)
// throw an exception or return an error code, because no solution exists for v
float cosAngle = Mathf.Cos(radians);
direction.Y = distance / cosAngle;
float velocity = Mathf.Sqrt((distance * Physics.gravity.magnitude) /
(2 * cosAngle * cosAngle * (tanAngle - hOverd)));
return velocity * direction.normalized;
}

I think you use Raycast wrongly. According to the doc, the second argument is the direction, not the destination:
if (Physics.Raycast(player.transform.position,transform.position, out hitInfo))
Should be
if (Physics.Raycast(transform.position, player.transform.position -
transform.position, out hitInfo))
That would explain why it is not firing at the right moment and why the direction is not accurate (since hitInfo is wrong)

Mouse input and z-axis

void OnMouseDrag() {
float distance = transform.position.z - Camera.main.transform.position.z;
Vector3 pos = Input.mousePosition;
pos.z = distance;
Vector3 mousePosition = new Vector3(pos.x, pos.y, pos.z);
Vector3 objPosition = Camera.main.ScreenToWorldPoint(mousePosition);
transform.position = objPosition;
}
This is the code snippet help me to move the object on mouse drag. It is moving object on mouse drag in x axis while z axis movement is not working correctly using mouse. I basically want to move the object on x and z-Axis using mouse Input.
What is wrong how can i get z position from the mouse input in order to move the object on z axis correctly.

When you casting ray to your object it is being calculated multiple times so it returns your ball position when its not being move a real deal you can try something like this
void OnMouseDrag() {
Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
Debug.DrawRay(ray.origin, ray.direction * 10, Color.yellow);
Debug.Log(ray);
RaycastHit hit;
if (Physics.Raycast(ray, out hit, Camera.main.farClipPlane))
{
if (hit.transform.gameObject.name == "CameraElasticPoint")
{
return;
}
else{
transform.position = new Vector3(hit.point.x,hit.transform.position.y+1, hit.point.z);
hitPoint = Input.mousePosition;
}
}
}
what it will do it will ignore your objects and works only on other hit info which would be your floor or any other surface you are trying to drag your object along and it will drag your object on X and Z axis taking the Y position of the Floor so it will always remain on top of the floor or any other surface collider on
let me know if it works
Good day

I would recommend going through the Unity Tutorial here:
http://unity3d.com/learn/tutorials/projects/survival-shooter-project
It might give you some ideas on how to solve the problem of x/z plane movement with the mouse.

No. screenpointtoray is very unnecessary here, you just need to say that pos.z is equal to pos.x....
like so...
Vector3 pos = Camera.main.ScreenToViewportPoint(Input.mousePosition - dragOrigin);
pos.z = pos.x;
Vector3 move = new Vector3(0, pos.y * dragSpeed, pos.z * -dragSpeed);
always a pleasure x