CONTEXT
I'm making a unity game and I need to test if my player is on the ground or not, for any of you familiar with things like "OnCollisionEnter", they won't work with the way make game functions, however, "OnControllerColliderHit" works, but there is no negative/exit for this.
What I want to do is have a boolean equal true while the function is running, and once the function has stopped being called (the player is not on the ground), this boolean would turn false.
Feel free to ask if you need any additional information, or (if you are knowledgeable in unity) find a different solution regarding "OnCollisionEnter".
Thanks!
if your problem is checking if the character is on the ground you can make a raycast from your character down to the ground and we add a margin for uneven
platforms you should change this value and find the one that best suits your
ground
float distanceToGround;
float margin;
void Start(){
// get the distance to ground
distanceToGround = collider.bounds.extents.y;
}
boolean IsGrounded() {
return Physics.Raycast(transform.position, -Vector3.up, distanceToGround + margin);
}
void Update () {
if (IsGrounded()){
//DoSomething
}
}
also if your character got a character controller component attached(as you are using OnControllerColliderHit so it is definitely attached ) you can simply check grounded like this
void Start(){
CharacterController controller = GetComponent<CharacterController>();
}
void Update() {
if (controller.isGrounded)
//DoSomething
}
Related
Basically on my map I'm trying to use Physics.CheckBox detect when the player is in certain areas to determine where my enemies will spawn at. I am using a layer mask to detect when its colliding with the player and Gizmos to visualize this box in the editor. The issue I'm having is that it will return true even when the player isn't inside the box. I have verified every single other game item does not have the player layer mask causing it to return true when it hits something else. The kicker is Physics.CheckSphere works perfectly except for the fact that my map is square, not circle, so I can't use check sphere because I can't cover all of the areas I need to cover.
Code for both is as follows, note that both of these lines are not in my script at the same time I alternated them out for testing:
atNeighborhood = Physics.CheckSphere(spawnAreas[0].transform.position, neighborhoodRange, playerLayer);
atNeighborhood = Physics.CheckBox(spawnAreas[0].transform.position, neighborhoodRange, Quaternion.identity, playerLayer);
Why would the CheckBox return true when colliding with items not in the layer mask but the CheckSpere works perfectly and only returns true when colliding with the player? Anyone have any idea?
LET ME KNOW IF THERE ARE ANY PROBLEMS OR ERRORS IN COMMENTS. THANKS!
Ok. CheckBox can get kind of confusing sometimes. I would reccomend something else.
You could use Empty Game Objects with colliders on them and put them where ever you want. IsTrigger must be set to true. Imagine these as "zones", where whenever you step in one, something can happen.
All you have to do is set a certain tag to each zone to activate different things.
Note: Player does not need rigidbody, but it would be a whole lot less messy if you did.
Here is a script if your player does have a rigidbody (put this script on your player):
void OnTriggerEnter(Collider obj)
{
if (obj.gameObject.CompareTag("Zone 1"))
{
SpawnZombies();
}
}
Player doesn't have rigidbody:
If your player does not have a rigidbody, you could put a bunch a script on each one called "zone activator".
Important Notes for this version:
Your player must have a collider and a unique tag.
On each zone add a rigidbody.
Make sure detectCollisions is false!
Make sure useGravity is false!
This zone detector should have it's collider be a trigger;
(You do not want this thing to move!)
You can now create a script that goes on each zone:
public string message;
public bool inZone;
void OnTriggerEnter(Collider obj)
{
if (obj.gameObject.CompareTag("player"))
//Or set it to whatever tag the player has
{
inZone = true;
}
}
void OnTriggerExit(Collider obj)
{
if (obj.gameObject.CompareTag("player"))
//Or set it to whatever tag the player has
{
inZone = false;
}
}
You must then reference this in the player's script
public ZoneDetector[] allZones;
void Update()
{
//.....
foreach (ZoneDetector zone in allZones)
{
if (zone.inZone == true)
{
if (zone.message == "zone 1")
{
DoZone1();
}
if (zone.message == "zone 2")
{
DoZone2();
}
}
}
}
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.)
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.
I have an issue with trying to get an 'object(character)' to walk around a cube (all sides) within Unity. Ive attached an image and video showing what i am trying to achieve. Im trying to show you visually rather than trying to explain. As the character drops over the edge it rotates 90 degrees and then the stands up like gravity has switched. Then the character can jump walk etc.
This is an example of someone else that posted a video showing exactly what im trying to achieve
I have looked through the forums and cant find what im after. i have tried to attach a diagram but the site wont let me. Any advice would be greatly appreciated!
Regards
Nick
You have a couple of options that I can think of.
One is to trigger the gravity change when the character exits one face of the cube to go to another. To achieve this you would have trigger zones on each edge and face and use a [Bob went from Face A to Edge ANorth -> Switch Gravity to go in X direction].
This would work for situations where the gravity switch must affect other objects too but be advantageous to your player (walking off the side makes an enemy fall off and die - for example.)
However, if you want all entities to stick to their relative sides then we need to make custom gravity! To do this is easier than you might think as gravity is simply a downward accelleration of 9.8. So turn off the engines native gravity and create a "personal gravity" component:
private Vector3 surfaceNormal;
private Vector3 personalNormal;
private float personalGravity = 9.8f;
private float normalSwitchRange = 5.0f;
public void Start()
{
personalNormal = transform.up; // Start with "normal" normal
rigidbody.freezeRotation = true; // turn off physics rotation
}
public void FixedUpdate()
{
// Apply force taking into account character normal as personal gravity:
rigidbody.AddForce(-personalGravity * rigidbody.mass * personalNormal);
}
Rotating your character and changing his normal is then up to you to suit your situation or game mechanic, whether you do that by raycasting if you're standing on a surface to detect when to change it or only want gravity to change when you hit a powerup or similar - experiment and see what works. Comment more if you have questions!
EDIT:
As an addition to the video you linked. You can keep a state variable on the jump state and raycast in each axis direction to check which face is nearest in the case of just rolling off.
public void Update()
{
// we don't update personal normals in the case of jumping
if(!jumping)
{
UpdatePersonalNormal();
}
}
public void UpdatePersonalNormal()
{
RaycastHit hit; //hit register
// list of valid normals to check (all 6 axis)
Ray[] rays =
{
Vector3.up, Vector3.down,
Vector3.left, Vector3.right,
Vector3.forward, Vector3.backward
};
//for each valid normal...
foreach(Ray rayDirection in rays)
{
//check if we are near a cube face...
if(Physics.Raycast(rayDirection , hit, normalSwitchRange)
{
personalNormal = hit.Normal; //set personal normal ...
return; // and return as we are done
}
}
}
Please keep in mind that the above is completely hand written and not tested but play with it and this pseudo start should give you a good idea of what to do.