So I am trying to make a multiplayer game with abilities sort of like Overwatch/Paladins. All in all, one ability should be a sort of projectile that moves across the ground and allows that player to teleport to its position at any time while it is alive. I can't find the solution to teleporting only the player that shot it since thus far in my tests, when one player activated their ability, all players would teleport. How can I solve this?
My code:
void Update()
{
if (Input.GetKeyDown(KeyCode.E))
GetComponent<playerController>().heldAbility = "gateCrash";
if (GetComponent<playerController>().heldAbility == "gateCrash")
holding = true;
else
holding = false;
if (holding && Input.GetMouseButtonDown(0))
PhotonNetwork.Instantiate(Path.Combine("PhotonPrefabs", "GateCrashModel"), spawnPos, transform.rotation, 0);
}
This code is attached to the projectile:
public float speed = 10;
PhotonView pv;
private void Awake()
{
pv = transform.GetComponent<PhotonView>();
}
private void FixedUpdate()
{
transform.Translate(transform.forward * speed * Time.fixedDeltaTime);
}
I guess that I should make have something as instatntiation parameter but idk what.
A simple approach would be to add a shotOwner property to each of your projectiles. Every time a projectile is fired, update shotOwner to point to the player object that fired the shot. (This will also let you implement "Player_X killed Player_Y" functionality, among other things.)
Related
I'm looking not so much for a throw as just maintaining motion after a ball is released by the hand in Hololens 2. Currently, I'm using the MRTK IMixedRealityTouchHandler interface, mainly the functions public void OnTouchStarted(HandTrackingInputEventData data) and OnTouchCompleted(HandTrackingInputEventData data).
On the Hololens 2 Emulator, when I release the ball with my hand (mouse), it drifts off in the air in the general direction I was pointing it towards relatively slowly, which is exactly what I want. I achieved this by reducing drag. However, once I build to the HL2 device itself, this motion is not emulated and the ball stops midair immediately after it is released. Why is this happening?
I've tried adding the line rb.AddRelativeForce(Vector3.forward * magnitude, ForceMode.Force); in OnTouchCompleted which wasn't successful. How can I maintain the ball's motion after it is released by my hand?
In general (I don't see the rest of your code) you can keep updating the velocity relative to the last frame and finally apply it.
Somewhat like e.g. (pseudo code)
private Vector3 velocity;
void BeginDrag()
{
rb.isKinematic = true;
rb.velocity = Vector3.zero;
lastFramePos = rb.position;
}
void WhileDrag(Vector3 position)
{
velocity = position -rb.position;
rb.position = position;
}
void EndDrag()
{
rb.isKinematic = false;
rb.velocity = velocity;
}
or actually even easier and probably more accurate you can directly use the
public void OnTouchCompleted(HandTrackingInputEventData data)
{
rb.velocity = data.Controller.Velocity;
}
See
HandTrackingInputEventData.Controller
IMixedRealityController.Velocity
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
I'm making a simple character that follows the player's cursor. What I also want is for when the game object "enemy" appears the character then goes to that location to alert the player. Once the enemy is gone the character continues to follow the cursor like normal. Is there a reason why my script won't work. How else can I paraphrase it?
public class FollowCursor : MonoBehaviour
{
void Update ()
{
//transform.position = Camera.main.ScreenToWorldPoint( new Vector3(Input.mousePosition.x,Input.mousePosition.y,8.75f));
if (gameObject.FindWithTag == "Enemy")
{
GameObject.FindWithTag("Enemy").transform.position
}
if (gameObject.FindWithTag != "Enemy")
{
transform.position = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x,Input.mousePosition.y,8.75f));
}
}
}
You are not using FindWithTag correctly, as it is a method that takes a string as parameter you need to use it like this:
GameObject.FindwithTag("Something") as stated in the Unity scripting API
Now to apply this to your code you would need to do the following to set your players position based on wether or not an enemy is found (assuming this script is on your actual player object):
if(GameObject.FindWithTag("Enemy"))
{
//If an enemy is found with the tag "Enemy", set the position of the object this script is attatched to to be the same as that of the found GameObject.
transform.position = GameObject.FindWithTag("Enemy").transform.position;
}
else
{
//when no enemy with the tag "Enemy" is found, set this GameObject its position to the the same as that of the cursor
transform.position = Camera.main.ScreenToWorldPoint( new Vector3(Input.mousePosition.x,Input.mousePosition.y,8.75f));
}
However this code will just snap your player instantly to the position of the found Enemy. If this is not the desired behaviour you could use a function like Vector3.MoveTowards instead to make the player move to it gradually.
This code also has room for optimisation as searching for a GameObject every update frame is not the ideal solution. But for now it should work.
I'm going to code coding all the function for you, I'm not pretty sure about the beavihour of your code, I understand a gameobject will be attached to the mouse position, so not really following....
Vector3 targetPosition;
public float step = 0.01f;
void Update()
{
//if there is any enemy "near"/close
//targetPosition = enemy.position;
//else
//targetPosition = MouseInput;
transform.position = Vector3.MoveTowards(transform.position, targetPosition , step);
}
For the f you can use a SphereCast and from the enemies returned get the closest one.
I've got a bullet script with a particle system and a decal.
I think that it has something to do with these events not being able to fire in time or with fps in update. Not sure yet.
So, it's being late.
The ellow points are where the particles start to play. They should be right on these wooden walls. There should be three particles working and three bullet holes, kinda bullet penetrating one wall and getting destroyed on the second one.
THE QUESTION IS HOW TO MAKE IT WORK NORMAL, SO THAT THE TRIGGERS WORK WHEN NEEDED AS WELL AS THE PARTICLES AND THE DECALS? Maybe there's a way to excellerate the code to work on time? Or maybe there's another problem with that?
The screenshot:
The Code:
public class BulletScript : MonoBehaviour {
public bool isThrough = true;
public float BulletSpeed = 100;
public float CurrentDamage;
public float EnterLuft = -0.005f;
public float ExitLuft = 0.05f;
public GameObject woodParticle;
private ContactPoint CollisionPoint;
public GameObject BulletMarkPref;
Rigidbody bullet;
private void Start()
{
bullet = this.GetComponent<Rigidbody>();
}
void FixedUpdate () {
bullet.velocity = Vector3.forward * BulletSpeed;
//this.transform.Translate(Vector3.forward * BulletSpeed * Time.deltaTime);
}
private void OnTriggerEnter(Collider other)
{
Transform hitPoint = this.transform;
LevelObject.LvlObjectType objectType = other.gameObject.GetComponent<LevelObject>().objType;
if(objectType == LevelObject.LvlObjectType.obstacle)
{
if (isThrough)
{
Instantiate(woodParticle, hitPoint.localPosition, Quaternion.LookRotation(-hitPoint.forward)).GetComponent<ParticleSystem>().Play();
LeaveBulletMark(this.transform, true);
}
else
{
Instantiate(woodParticle, hitPoint.localPosition, Quaternion.LookRotation(-hitPoint.forward)).GetComponent<ParticleSystem>().Play();
LeaveBulletMark(hitPoint, true);
Destroy(this.gameObject);
}
}
else if(objectType == LevelObject.LvlObjectType.obstacle)
{
Destroy(this.gameObject);
}
else if(objectType == LevelObject.LvlObjectType.wall)
{
LeaveBulletMark(hitPoint, true);
Destroy(this.gameObject);
}
}
private void OnTriggerExit(Collider other)
{
Transform hitPoint = this.transform;
Instantiate(woodParticle, hitPoint.localPosition, hitPoint.rotation).GetComponent<ParticleSystem>().Play();
LeaveBulletMark(hitPoint, false);
}
void LeaveBulletMark(Transform hitPoint, bool ifEnter)
{
GameObject TemporaryBulletMarkHandler;
TemporaryBulletMarkHandler = Instantiate(BulletMarkPref, hitPoint.localPosition, Quaternion.LookRotation(ifEnter ? hitPoint.forward : CollisionPoint.normal)) as GameObject;
isThrough = false;
TemporaryBulletMarkHandler.transform.Translate(hitPoint.forward * (ifEnter ? 0.005f : -0.005f));
}
}
I don't think your problem is something simple with the code. There is an inherent issue with calculating fast moving objects like bullets with true physics calculations especially if they are small. Often between physics updates, they pass through wall colliders completely without registering.
You have to think of it like this to see the problem. The bullet isn't tracked continuously along its trajectory. It has a starting location, a formula for its movement and it calculates a new location at each physics update. You could fire a bullet straight at a wall, and in one update the bullet would be several meters in front of the wall, and in the next, it would be several meters behind the wall without ever triggering a collision. This is why so many game use ray tracing to calculate bullet trajectories. The bullet movement isn't perfectly accurate, especially for long shots, but obstructions to the bullet path are registered.
By default unity's Physics Engine runs at 50 frames per second. A modern bullet travels between 1200 and 1700 m/s. That gives you a distance between 24 and 34 meters traveled between frames. Even a small object falling at terminal velocity (54 m/s) might pass through a collider unnoticed. If you made a 1-meter thick box collider, you would likely register a falling object but not a bullet.
I think you could do some clever combination of ray tracing and bullet physics to get the best of both worlds. Maybe you could ray trace from the bullet at each fixed update or there may be some better technique already invented for this exact situation that I don't know about.
In Unity, I want to create a platform that rotates like a propeller. When it hits an object, I want that object to go flying in a logical direction. If I just update the object's rotation every frame, the object tends to stick to the platform and pass through it at higher speeds. I'm thinking that Unity's physics would be the best solution - how can I rotate the platform at a constant speed such that it can do what I want? In addition, how can I start and stop the spinning without it speeding up or slowing down? I'm using C#.
If you're looking to incorporate Unity's physics into your platform behaviour, but don't want to deal with adding force/torque to change its rotational speed, consider using Rigidbody.angularVelocity. With this, you can also start and stop the rotation instantly (use FixedUpdate() when you're working with a RigidBody).
So your code may look like:
Vector3 activeVelocity = new Vector3(0, 10, 0);
bool isStopped = false;
RigidBody rBody;
void Start() {
rBody = GetComponent<Rigidbody>();
}
void FixedUpdate() {
if (!isStopped){
rBody.angularVelocity = activeVelocity;
}
else{
rBody.angularVelocity = Vector3.zero;
}
}
public void ActivateRotation() {
isStopped = false;
}
public void FreezeRotation() {
isStopped = true;
}
Hope this helps! Let me know if you have any questions.