Official Roll-a-ball Tutorial Q&A

Code looks ok s1mpleduck.

Do they just "disappear", or fall through the floor. It sounds like you may have an issue with a setting somewhere , which is more difficult to diagnose through the forums. Try checking a couple things,

Make sure the sphere collider is scaled to match the player sphere,
Make sure that convex is not selected on your floor plane,
make sure isKinematic is selected on your pick up cubes,
make sure you didn't add the collision scripting to your pick ups.

I have one other suggestion, but want to test it first.

 

They just disappear when i press play, I just checked the other things and they still disappear

 

I dont understand how to do that

 

Did you click on the link I put in my post? It tells you how to do that.

 

I did but im very confused

 

s1mpleduck,

It seems confusing at first but it is not difficult once you do it. In your editing program highlight your code and press CTRL + C to copy it.

In your forum post there is a bunch of little icons across the bar at the top. Towards the right side, if you mouse over you will see one that says "insert" (looks like a menu). If you click on that it will bring up a window. You can click in the window then hit CTRL + V to paste your code.

 

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. public class playercontrol : MonoBehaviour
4. {
5.     public float speed;
6.     private Rigidbody rb;
7.     void Start()
8.     {
9.         rb = GetComponent<Rigidbody>();
10.     }
11.     void FixedUpdate()
12.     {
13.         float moveHorizontal = Input.GetAxis("Horizontal");
14.         float moveVertical = Input.GetAxis("Vertical");
15.         Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);
16.         rb.AddForce(movement * speed);
17.     }
18.     void OnTriggerEnter(Collider other)
19.     {
20.         if (other.gameObject.CompareTag("Pick Up"))
21.         {
22.             other.gameObject.SetActive(false);
23.         }
24.     }
25.  

 

I've finished the tutorial and it's great. However, I had to remove the text because it was too big to fit on the screen. On the tutorial it seemed small but it took me over 30 seconds to zoom out to see the text! Any ideas on why Unity would do this?

 

Tou probably entered a wrong size for the text. Or you ticked the "best fit" box.

 

BramSter,

It sounds like you may confusing the text as seen on the game tab, v.s. as seen on the scene tab. Don't worry too much about how it looks in the scene tab, as long as it is correct in the game.

 

Hi.

I want to play the game on my android phone. I selected android in the build setting window but I don't know how to put it in my phone. (I have my phone connected to my laptop).

 

You may get better responses if you post this in the Android Forum.

 

Can somebody help me? I made it to the end of the tut and in the game view everything works just fine. But when I build up my game, and want to play it outside the editor, this is the only thing i see. the score i got, but not the rest of the game. and it doenst matter in what resolution i run it.

 

Joost26,

Make sure in your build setting that you have the correct platform selected. It's possible to have the correct platform highlighted, but not selected. It needs to have the Unity symbol to the right of the platform. Double check build settings and try again and see if that makes a difference.

 

hiii even im facing the same problem i checked everything but its not working and i got one warning that
There are inconsistent line endings in the 'someFileName.cs' script. Some are Mac OS X (UNIX) and some are Windows.
This might lead to incorrect line numbers in stacktraces and compiler errors. Unitron and other text editors can fix this using Convert Line Endings menu commands what can i do now please help me out

 

kprsnt,

The inconsistent line endings should have no effect on the way the program runs. It may cause it to be a little harder to debug by line numbers is all. Here is a good post explaining it.
https://forum.unity3d.com/threads/inconsistent-line-spacing.454164/

If you could explain what is not working and post any relevant code you have someone here may be able to help you. Be sure to use code tags as it makes it much easier for others to read your code. Post #1207 in this thread gives a quick how to if you're not sure.

 

Did you both add the scene when you built your games?

https://docs.unity3d.com/Manual/BuildSettings.html

 

Hello, Is there a video that shows how to make it playable with android? That would be great

 

This is all very frustrating for a beginner. Is there a "Unity for Dummies?" Are there any tutorials in, say, a PDF, so I don't have to keep scrolling back the video? Are there any tutors available? I need something that starts with "This is the letter "A," or whatever the game designer/programmer equivalent is.

 

Hey,
Nice tutorial on Roll-a-ball. I would like to know how can i add a objects through the c# code.

I tried the below code in players component but it doesnt seem to work!

void Update()
{
var gameObject = new GameObject("PickUp");
gameObject.tag = "PickUp";
gameObject.SetActive (true);
var meshFilter = gameObject.AddComponent<MeshFilter>();
gameObject.AddComponent<MeshRenderer>();
meshFilter.sharedMesh = objectToCreate;
Vector3 movement = new Vector3 (transform.position.x-2f, 0.5f, transform.position.z-5f);
gameObject.transform.position = movement;

gameObject.transform.rotation = transform.rotation;
}

 

Your code is incomprehensible, use the code tags so that it becomes more readable: http://forum.unity3d.com/threads/using-code-tags-properly.143875/

 

Smit95,

As AnneSchmidt mentioned, code tags make the code much easier to interpret and are easy to use.

I see you want to use C# to add the objects, but your sample code looks like JavaScript (UnityScript). Typically the easiest way to add objects is by instantiating your prefab. Here is the scripting API for it
https://docs.unity3d.com/ScriptReference/Object.Instantiate.html
though there are quite a few options, I think the most common use is

Instantiate(object, vector3 position, vector3 rotation);

 

Hi Anne,

Yes i added the scene and used the correct platform with the unity logo on it!

maybe there is something wrong with the settings?

 

Hello everyone, this is a great project for learning Unity. It is the very first time i worked with it and after finishing this tutorial I feel like I learned a lot. I do however have a big question mark, about the UI. Specifically the canvas and text overlay, in the tutorial you don't even see the canvas and everything looks smooth and easy, well when i created the text it looked all weird and the canvas was huge. Can someone please explain me why is that?

 

HI there, i've been watching this tutorial but I can't go over the secondo point since, whatever i do, my ball doesn't want to move. This is the code that i've written

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class move : MonoBehaviour {
6.  
7.     public Rigidbody playerRigidBody;  
8.     public float speed;
9.  
10.  
11.     void Start () {
12.        
13.         playerRigidBody = GetComponent<Rigidbody> ();
14.         if (playerRigidBody != null)
15.         {
16.             Debug.Log ("Success! We have a Rigidbody reference!");
17.         }
18.         else
19.         {
20.             Debug.Log ("Failure! We do not have a Rigidbody reference!");
21.         }
22.     }
23.    
24.     void fixedUpdate () {
25.        
26.         float moveHorizontal = Input.GetAxis ("Horizontal");
27.         float moveVertical = Input.GetAxis ("Vertical");
28.  
29.         Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
30.  
31.         playerRigidBody.AddForce(movement * speed);
32.  
33.     }
34. }
35.  

In addition here's a screen of my unity ui

ps what instance id and local identifier do?? thanks in advance

 

Bobonevive96,

Line 24 should be FixedUpdate, with capital F.

I believe instance ID and identifier are ways to identify that particular component, but not sure.

 

PaToNi,

If you are referring to the way the canvas looks in the scene view, I think it is pretty normal to look strange there. As long as it looks ok in the game, I think you will be fine.

 

thanks, but it still doesn't work

 

Other than the lowercase f in your FixedUpdate method the code looks good.

A common issue is forgetting to set the speed value in the inspector, but I see in your picture you have it set to 100.

I would check the input manager and make sure the input is set up for the keys you are using.

 

Just noticed on your Rigidbody you have isKinematic selected. You want that to be unselected so physics forces will apply. That should fix it for you.
edit> also select use gravity

 

still nothing neither with arrows nor asdw

[EDIT]: I've also checked the imput manager and i've stetted arrows as imput and asdw as alternative imput

 

can you tell me how to fix compile errors

 

ABDULLAHGULZAR, Compile errors typically mean something is wrong with your code. Could be something simple as missing a curly brace, or something spelled incorrectly. Try posting your code here and someone may be able to locate the issue. Or if you could post an error message.

Bobonevive96, your issue is vexing me and is probably outside of my limited knowledge. How did you get the Identifiers and instance name fields to show up in your inspector. I don't get that in my inspector, maybe that has something to do with it. I doubt it, but....

 

Ryeath (i don't know how to tag), i'm an absolute beginner in unity and i still don't understand everything (i understand only very little tbh). at the beginning I had my inspector on normal and i had my script greyed and I read on another forum that i need to have my inspector on debug and as soon as i switched it to debug they've showned up, i don't know how i don't know why

 

So, tutorial was great first off, but i have a question, say i wanted to connect my game to another level, like i collect all the "points" and you win. but how do you change levels after you win? could someone tell me how?

 

I am using the latest Unity (version 5.5.2f1) and latest XCode (8.2.1) as of Feb 2017.

My Unity sample project "Roll a Ball" works perfectly well on my Mac. But, when I build and deploy it on my iPad, and play it, I notice that the ball does not roll or move at all, which is the problem here. (But, all the cubes are rotating just fine on iPad).

Does anyone have any idea on how to fix this ?

Thanks.

 

So I've done the whole first tutorial now, the ball game. I built it and ran it. Everything works except collecting the collectables. I just go through them and there's no collision. Any ideas? I've even copied the scripts from the tutorial (wrote by hand to get it in to my fingers first).

It works perfectly like it should in game mode in Unity, just not in the executable file.

 

Came accross this a while ago as well, try resetting/reselecting the tags on the collectables and the player. think they go a bit funny when built sometimes (not very often tho)

 

how are you controlling it on the Ipad?
Im guessing that the Mac you are using the keys, but the mobile device would use the accelerometer i assume?

 

afternoon,
you will have to use the new scenemanager to load another scene
https://docs.unity3d.com/ScriptReference/SceneManagement.SceneManager.LoadScene.html

look at the build index in File > BuildSettings to get a list of scenes and their values.

also remember to include the UnityEngine.SceneManagement; namespace at the top as shown in the example script on that page above.

 

Sadly it doesn't seem to work =/ Thanks anyway.

Al the collectables in the hierarchy are blue while every other thing is black. I wonder if that has anything to do with it.

 

the blue tint in the names means they are prefabs.
Just out of curiosity is the current scene the one that you have in your Build Settings just in case your working on a different one that whats getting built?
File > BuildSettings

 

Hey, it worked out with your tip afterall. Turned out I only reselected and thoguht that might do it. And when my brain started working again I managed to reset the tag and because I had the script open I needed to write in the exact same tag again it seemed. Anyway, it works now. Thank you so much

 

I'm having trouble with Roll a Ball (3), Moving the camera. In the hierarchy view, I place the camera into the Player folder (child of the player), and then hit the play button. Using the a and d keys, the whole plane and ball rotates, where as before it did not rotate. It just moved the ball.

 

Paul,

The camera should not be a child of the player sphere. It should be it's own independent object that uses an offset from the player sphere transform.

 

I followed the part 01 of tutorial, and the ball is in position 0, 0,5, 0, on the ground, like this:

But when i hit play, the ball goes up and if i hit keys, the ball moves off the plan

 

imthemonster,

check your plane (ground object) and look at the collider on it. Make sure it is a mesh collider, not a box collider. It is behaving like your ground has a box collider and the sphere is inside of it. When that happens the first thing the game does when it starts is to kick the sphere out of the box.

If that doesn't do it then make sure you reset the transform of the sphere and if you have the sphere as a child of anything that should be reset also.

 

I have added the skybox to the scene, but since the camera is oriented in a way that the player won't ever see it, I want to remove it. How do I do that?

I have also tried to make the pickup cubes (or in my case, coins) move to another point on the XZ plane after I pick them up, but they are also being moved in the Y direction. The relevant code bit goes like this:

Code (CSharp):

1.     private void OnTriggerEnter(Collider other)
2.     {
3.         if (other.gameObject.CompareTag("Coin"))
4.         {
5.             //DestroyObject(other.gameObject);
6.             Debug.Log(other.gameObject.transform.position.x);
7.             Debug.Log(other.gameObject.transform.position.y);
8.             Debug.Log(other.gameObject.transform.position.z);
9.             other.gameObject.transform.Translate(Random.Range(-10f, 10f) - other.gameObject.transform.position.x, 0f, Random.Range(-10f, 10f) - other.gameObject.transform.position.z);
10.             Debug.Log(other.gameObject.transform.position.x); //this should be and is a random value between -10 and 10
11.             Debug.Log(other.gameObject.transform.position.y); //this should stay unchanged but is also is a random value between -10 and 10
12.             Debug.Log(other.gameObject.transform.position.z); //this should be and is a random value between -10 and 10
13.         }      
14.     }

 

ZeRuc,

Have you tried using transform.position, instead of transform.translate?

Translate moves the object in a linear fashion and typically has a distance that it moves each frame, and the movement is relative to the objects local orientation unless global is specified. If your coins are rotating on either the X or Z axis, that could be causing your issue. So if you want it to move immediately to the new location you probably want to use transform.position.

As for the Y axis changing, I'm not sure, the code looks ok but is a bit hard to read. When I get into a lot calculations I like to do them separately on their own line before putting them into a Vector3.

https://docs.unity3d.com/ScriptReference/Transform.Translate.html

 

That explains it! I've used a script to make the coins slowly rotate for a better visual effect which obviously changed their orientation. Now I changed the code to:

Code (CSharp):

1. other.gameObject.transform.position = new Vector3(Random.Range(-10f, 10f), 0.5f, Random.Range(-10f, 10f));

and it works like I intended