I am using Unity 2019.2.
Here is my code:
GameObject[] damageTexts = GameObject.FindGameObjectsWithTag("CombatText");
foreach (GameObject damageText in damageTexts)
{
damageText.transform.LookAt(Camera.main.transform);
}
It is making all 3D Texts which I want to look at the camera. However the text is backwards written ?
Why? How can I fix that?
LookAt
Rotates the transform so the forward vector points at /target/'s current position.
Unity UI components usually have their forward vector pointing away from the camera. So you need to always invert the direction if you want to use LookAt
damageText.transform.LookAt(damageText.position - Camera.main.transform.position);
This simply makes it look at a position in the opposite direction.
You can also use LookRotation
damageText.transform.rotation = Quaternion.LookRotation((damageText.position - Camera.main.transform.position).normalized);
Related
I wish to create a ball character similar to red ball game in unity 2d but I can't seem to get it to work like the one in red ball. I wish for the ball to ROLL left and right and be able to Jump. I managed to make it roll left and right by adding a physics material and bumping up the friction and adding the rb.AddForce() function but I am having trouble with the jumping. I tried rb.velocity() but when I jump and move right or left, the ball adds force too strongly and it just moves too swiftly . Am I missing something or is there a better way of doing this? I need help.....
A quick fix for this would be to define an upper limit. Like:
float limit = 10f;
Rigidbody2D rig;
void Start(){
rig = gameObject.transform.GetComponent<Rigidbody2D>();
}
void Update(){
if(Input.GetKeyDown(KeyCode.A && rig.velocity.magnitude < limit){
rig.AddForce(accelerationVariable);
}
}
I would use Rigidbody.velocity.magnitude because it gives you the length of the vector.
If you just want to check the x-Force use Rigidbody.velocity.x
Hope that helps
I have a laser turret in Unity3D, which I'd like to turn towards the enemies. The turret consists of a "leg" and a "head" (selected on the picture 1). The head can pan and tilt around a spherical joint.
I do the following:
Vector3 targetDir = collision.gameObject.transform.position - turretHead.transform.position;
float step = turnSpeed * Time.deltaTime;
Vector3 newDir = Vector3.RotateTowards(turretHead.transform.forward, targetDir, step, 0.0f);
turretHead.transform.rotation = Quaternion.LookRotation(newDir);
The problem is that since the pivot of the head is not aligned with the laser beam, the turret turns into the almost right direction, but it shoots above the target. (It would hit perfectly, if the laser would come out of the red axis of the pivot.)
Is there a builtin method or some trick to achieve the correct functionality other then doing the calculation myself?
Okay, here's the quick and easy way to do this. It's probably "better" to do it with proper trig, but this should give you the result you want pretty quick:
If you don't already have a transform aligned with the barrel, then create an empty GameObject and line it up (make sure it's a child of the turret so they move together). Add a reference to your script for it's transform.
Then, in your first line, calculate from the new Barrel transform instead of the turretHead transform. Leave everything else the same. This way it calculates from the turret barrel, but moves the turret head.
Now, this approach isn't perfect. If the pivot center is too offset from the barrel transform, then it would be less accurate over large moves, or when aiming at something close by, because the expected position when aiming would be different than the initial position due to the rotation pivot being elsewhere. But this can be solved with iteration, as the calculation would become more accurate the closer it is to it's desired goal.
I'm trying to figure out how Graphic.Raycaster works, but documentation doesn't help. I want to use it to cast raycast from some position at a certain angle and hit the UI. The other thing is that I don't know how to make it interact with the UI(drag, click etc.). I know that's broad subject, but I just can't find any good explanation of how to use it, so I would be grateful for any explanation.
From Unity docs:
The Graphic Raycaster is used to raycast against a Canvas. The
Raycaster looks at all Graphics on the canvas and determines if any of
them have been hit.
You can use EventSystem.RaycastAll to raycast against graphics(UI) elements.
Here is a short example for your case:
void Update() {
// Example: get controller's current orientation:
Quaternion ori = GvrController.Orientation;
// If you want a vector that points in the direction of the controller
// you can just multiply this quat by Vector3.forward:
Vector3 vector = ori * Vector3.forward;
// ...or you can just change the rotation of some entity on your scene
// (e.g. the player's arm) to match the controller's orientation
playerArmObject.transform.localRotation = ori;
// Example: check if touchpad was just touched
if (GvrController.TouchDown) {
// Do something.
// TouchDown is true for 1 frame after touchpad is touched.
PointerEventData pointerData = new PointerEventData(EventSystem.current);
pointerData.position = Input.mousePosition; // use the position from controller as start of raycast instead of mousePosition.
List<RaycastResult> results = new List<RaycastResult>();
EventSystem.current.RaycastAll(pointerData, results);
if (results.Count > 0) {
//WorldUI is my layer name
if (results[0].gameObject.layer == LayerMask.NameToLayer("WorldUI")){
string dbg = "Root Element: {0} \n GrandChild Element: {1}";
Debug.Log(string.Format(dbg, results[results.Count-1].gameObject.name,results[0].gameObject.name));
//Debug.Log("Root Element: "+results[results.Count-1].gameObject.name);
//Debug.Log("GrandChild Element: "+results[0].gameObject.name);
results.Clear();
}
}
}
The above script is not tested by myself. So there might be some errors.
Here are some other references to help you understand more:
Graphics Raycaster of Unity; How does it work?
Raycast against UI in world space
How to raycast against uGUI objects from an arbitrary screen/canvas position
How do you perform a Graphic Raycast?
GraphicRaycaster
Hope it helps.
Umair M's current suggestion doesn't handle the fact that the ray is originating in world space and traveling at an angle.
It doesn't look to me like you can do a GUI raycast in world space at an angle even if your canvas is in world space. This page suggests a technique of creating a non-rendering camera, moving it around in 3D space with the ray you want to cast, and then doing the GUI raycast relative to that camera. I haven't tried it yet, but it sounds promising.
I'm trying to make a respawn system for a game in unity that starts the character back on the last platform they were on.
As it is currently, it keeps track of which platform they were last grounded on with onCollisionEnter and detects if onCollisionExit touches an out of bounds area.
I need to find the position of a face on the mesh with the y axis (assuming the best way is to do a raycast on the global y axis from the center of the platform) and add the height of the character/2 to determine where to respawn the character.
I'm very new to unity and c#, so I've never done a raycast before and I'm not sure if it's possible to raycast from inside an object to find it's mesh in a given direction, or if there is a better/more efficient way.
Thanks in advance :)
"if it's possible to raycast from inside an object to find it's mesh in a given direction"
You can place a empty gameobject at the center of your mesh (make it child of your mesh ) then pass the position of this empty gameobject to raycast origin.
I usually make re-spawn system with triggers. If you explain little bit more what actually you want to do. I'll try to guide you in that particular direction.
I am working on a game, and I currently have objects continuously orbiting around a sphere at a fixed distance. I need to allow the object to bounce off of each other. Does anyone know how I can go about doing this?
I have the collision detection working, and each object has a bounding sphere. I am able to get the point of collision, I just need to take the current rotation vector from each object and get the resulting "bounce" angle (vector to rotate around) and have each object continue orbiting around it's new vector.
Let me know if that doesn't make sense or if you need anything else! I should mention that this is done using Unity3D (I am not using rigidbodies, or the built in physics engine for performance reasons)
Edit:
Here is what I've tried:
public void OnTriggerEnter(Collider collider)
{
// Determine resultant rotation axis
Vector3 collisionNormal = collider.ClosestPointOnBounds(thisTransform.position);
rotationAxis = Vector3.Reflect(rotationAxis, collisionNormal);
}
Here is a link to the Vector3.Reflect() method in the Unity3D docs: Vector3.Reflect()
At this point the objects don't start moving in a new direction they collide and then don't bounce off. They just appear to stop when the collision occurs.