Develop Reference

Hold down UI button to perform an action in unity

I'm making a simple game in unity, and I decided to make it able to be played on mobile, so to move a cube I use the AddForce method inside of the update method, but now I added two buttons to move the cube, but the problem is that I have to make the action on a hold function instead of click one, so how is that done in unity?
something like this but with a button hold...
if (Input.GetKey("a") || Input.GetKey("[4]") || Input.GetKey("left"))
{
rb.AddForce(-sideWaysForce * Time.deltaTime, 0, 0, ForceMode.VelocityChange);
}
And I'm using Unity 2020.

What you can do is you can add a rigidbody to the cube and make a script for the ui canvas. Once you done that, you can reference the cube like this : public GameObject cube;. Then in the update function what you can do is add some if statements checking if either button is pressed. And if for example the button that makes the cube move left is pressed, add a force to the cube on the x axis. I can give you a hint on how to do this : cube.GetComponent<Rigidbody>().AddForce(15, 0, 0). I'm sure you can figure the rest out by yourself.
I hope you found this useful! :D

Vuforia + Unity : Instantiate model in AR when UI Button pressed

I know this is a really simple question but I can't figure out how to archive this:
I have a UI button in my scene and I want Vuforia to instantiate one AR Model ONLY when I press a button.
Following the tutorial on the net I was able to instantiate a model on the screen when I touch it but I need to know how to set up Vuforia for archive the same result only when I press a button.
I have to disable the "Anchor Input Listener Behaviour"?
And then?
I want to call for the PositionContentAtPlaneAnchor but I can't figure out how to call it in the right way in the OnClick field of the button. I need to make a custom script for this?
Thanks for any answer.

Ok, sorry for the delay.
I deduce that you are working with the ground plane, if you have the Ground Plane Stage and the Plane Finder in the scene and works, we're at a good point.
Now, you must only add a button to the scene and into the script add something like this:
public PlaneFinderBehaviour plane;
void Start()
{
...
buttonOnTheScene.onClick.AddListener(TaskOnClick);
...
}
void TaskOnClick()
{
Vector2 aPosition = new Vector2(0,0);
...
plane.PerformHitTest(aPosition);
}
What does it mean?
First of all, you must move the Plane Finder from Hierarchy to the script variable, so we have a reference to the plane into the script.
Then when you click (or tap) on the button you simulate the click (or tap) on the display with the PerformHitTest.
If you're wondering why my question in the comment, it's because the Plane Finder Behaviour Script has two modes type: Interactive and Automatic. The Interactive intercept the tap on the display and shows the object (on the ground plane) in the exact position of the tap, the automatic shows the object in the center of the plane.
So if you want the object in an exact position you can pass a Vector2 position in the PerformHitTest and if you want to show an object programmatically or do something when it shows the object you can call a custom method OnInteractiveHitTest.
That's all.

Create objects with ground plane detection only once with Vuforia & Unity

I am trying to create an AR app using Unity & Vuforia. I have a 3D model that needs to be spawned when ground plane is detected.But this needs to happen only once.
The way Vuforia work is, it keeps on spawning objects when new plane is detected. So what i need to do is either detect plane only once or spawn the object only once. As i am new to Unity, i need help doing this. Great if someone could tell me what i need to do to achieve this.

Vuforia has updated.Now There is no DeploymentStageOnce script.Inorder to stop duplicating while we touch, we have to turn off Duplicate Stage in Content Positioning Behaviour (Script)Check the Inspector when we click Plane Finder.

In your app you should have a Plane Finder object somewhere with the following properties set by default
The Plane Finder object has a Behaviour component attached that calls a Position Content method if a plane was found. That method belongs to the Content Positioning Behaviour and it makes an instance (Clone) of your Ground Plane Stage. In order to avoid more than one instance you should import the vuforia Deploy Stage Once script located here: https://library.vuforia.com/articles/Solution/ground-plane-guide.html and you should change the Plane Finder Behaviour as the following:

I struggled a long with it, in short we must disable AnchorInputListenerBehaviour after hit.
I attached a new script on PlaneFinder with this code below:
<!-- language-all: c# -->
public void OnInteractiveHitTest(HitTestResult result)
{
var listenerBehaviour = GetComponent<AnchorInputListenerBehaviour>();
if (listenerBehaviour != null)
{
listenerBehaviour.enabled = false;
}
}
I added event on Plane Finder Behavior
That's all, I hope it will be useful.

For Updated Versions:
go to "Advanced" setting and "On Interactive Hit Test" script -> Select "Off" option for the script.

Most of the answers are correct but kind of obsolete, the correct way to do that is by code.
Create for example a gameObject called GameManager and pass the GroundPlaneStage and a prefab of the object you want to spawn to a script attached to that GameManager for example call it GameManagerScript.cs, and create a small function called spawnObjects which does the following:
public class SceneManagerScript : MonoBehaviour {
public GameObject objPrefab;
public GameObject ground;
private int count = 0;
public void spawnObject() {
Instantiate(objPrefab, new Vector3(count, 0, 0), Quaternion.identity, ground.transform);
count += 2;
}
}
then after that go to the PlaneFinder specifically to the PlaneFinderBehaviour.cs component you will have callbacks for OnInteractiveHitTest and OnAutomaticHitTest, in your case you need the OnAutomativeHitTest, click + and add a new callback (the function spawnObject in code above like in the image below)
also when you instantiate the object of your preference via the prefab don't forget to write the proper position updates to prevent the objects from getting added in the same position
also don't forget to make the GroundPlaneStage the parent of the object and realize that the position you are adding in the Instantiate() function is relative to that parent (GroundPlaneStage which is represented in the code above with the variable ground)
Finally don't forget to uncheck Duplicate Stage from the "Content Positioning Behaviour" component in the Plane Finder as shown in the picture below:
I hope that helps

please try the vuforia website for this problem
Introduction to Ground Plane in Unity

c# OnTriggerStay with Collider Variables

So I'm making a simple "puzzle" using lights. Simply, there are 3 buttons with lights on them (red, blue, green). Each button has it's own trigger volume but when I go to play, nothing prints that I even enter, stay, or leave the trigger. I've never used Collider Variables before so I feel like I'm doing something wrong (obviously or it would be working!). But then I just did "Collider entity" in the OnTriggerStay/Enter/Exit Method and it still didn't print to the console that my player was entering. Why are my Triggers not working?
Click here for the code I'm trying
Click here to see how I have it in the Unity Scene

Triggers only respond to other colliders that have rigid bodies on them.
Try adding a Ridgidbody component to your player and set it to kinematic.

OnTriggerEnter/Stay/Exit works when the Object has a Collider Component and BluePuzzle2 doesn't have that.
Also OnTrigger function gets a Collider as parameter. Check the reference page
So in order to make that work put a script on every light and on that script copy this function
void OnTriggerEnter(Collider col) {
if (col.CompareTag("Player")) {
print("Entered the trigger");
}
}
Hope it helps.

Changing Sprites using scripts in Unity2D C#

I am wanting to make a birds-eye view pixel-art game.
I currently have two sprite sheets set up, and split and whatnot
groundSheet and characterSheet these are split up into
ground_0_0_0 (A concrete floor)
ground_1_0_0 (grass)
character_0_0_0 (man idle animation frame 1)
character_0_0_1 (man idle animation frame 2)
character_0_1_0 (man run animation frame 1)
character_0_1_1 (man run animation frame 2)
character_1_0_0 (woman idle animation frame 1)
character_1_0_1 (woman idle animation frame 2)
character_1_1_0 (woman run animation frame 1)
character_1_1_1 (woman run animation frame 2)
The numbers after are a note as to:
first number - the main set of sprite animations (eg man)
second number - the animation set in use (eg run or idle)
third number - the frame of said animation.
(the ground has this as i plan to have animated grounds late on)
Now, I wish to make a script for the character (and ground alike) that has an editable value that is view able in the unity editor, for example how things like the sprite renderer has sprite, colour etc. Which dictates what first number to use (see above) what second number and the delay for the animation of the third number. This will then tell the sprite renderer what pictures to load and how quickly to load them. I also wish for the script to scan for the file starting with for example character_0_0_ and then count how many files after it, so it knows what to do when animating. I would like this script to be checking for a change in one of the variables viewable in the unity editor to change and as soon as it does it checks everything it needs for an animtion.
Something else could be done where there is only 1 box to edit in unity, which you put character_0_0_ or ground_1_0_ or something similar, and it checks everything that way (it also makes the script universal, and usable on the ground, character and walls (which I am adding later)).
This may seem confusing, but it make sense for me and many of you will probably mention a much easier way to do animations and such, but please only say these if it does what I want above.
For scripts and such my file layout:
/Assets
/scripts
ground.cs
character.cs
/sprites
characterSheet.png
character_0_0_0
character_0_0_1
character_0_1_0
character_0_1_1
character_1_0_0
character_1_0_1
character_1_1_0
character_1_1_1
groundSheet.png
ground_0_0_0
ground_1_0_0
(For some reason Stack overflow said the above was code, so i had to make it as that)
ground.cs and character.cs are the scripts in which I want to made as explained above.
In my object view thingy I have
Main Camera
ground
character
I am practically a newb to C# and JS I know bascially the grammar of C# (like where to use {} and put ; at the end of the lines). If you help me with this, i request that you explain the script, like use the // thing to simply explain what each command does, I know a few but not all of them. And I know someone is going to say it is really well documented in tutorial X and such, but most tutorials are not in unity 5 and while helping with the matter do not touch on it exactly.
Thank you for your help, if there is anything about this question/request that you do not understand (It is pretty complex) I will explain.

Maybe I am completely wrong, but it seems to me that you are trying to recreate an Animation system.
Is there a specific reason for which you wouldn't use Unity's animation system?
You can do everything that you describe here with it (change sprite, choose animation speed). And you would have almost no code to write. Just drag and drop you sprites in the editor for a start
EDIT - answer to first comment:
What you should do is create all the animations you need. Then in the animator, you choose which condition will trigger a transition to another animation (for instance, boolean jump is true will transition to animation jump). Then in your code you can call GetComponent().SetBool("Jump", true).
To have different character, you can create different gameObjects (one per character). They all have a different animator with animations specific to the character.
The other solutiojn if you really want one one gameObject and one animator is that you also add string condition to you animation (example, if character=="character1" and jump==true, transition to jump animation).
If I were you I would really focus on testing and learning all you can do with Unity animator. I can't think of a case were you would need to recreate the animation system yourself

Your question was long winded and hard to understand but ill try to help,
firstly if you want editable values in the unity editor I would Suggest using a serialized structure of information like this
[System.Serializable] // this makes it viewable in the inspector
public struct Sprite_Manager;
{
public Sprite[] Render_Sprites; // array of sprites to store sprites
public SpriteRenderer S_Renderer;
public float Anim_Delay;
}
public class Character : MonoBehavior {
Sprite_Manager SMG = new Sprite_Manager(); // instantiate a new instance of the struct
void Set_Sprite()
{
for(int i = 0; i < SMG.Render_Sprites.Length; i++)
{
SMG.S_Renderer.sprite = SMG.Render_Sprites[i];
}
}
void Update
{
Invoke("Set_Sprite", SMG.Anim_Delay);
}
}
Not sure if this is exactly what your looking for but this is one way you could setup a structure of sprite based information and use Invoke to setup some sort of delay when passing new sprites to the renderer.