2D UFO Tutorial Q&A

Hi,

Great tutorial thank you!

I'm scratching my head over something... the Win Text component in Unity's Game View appears in a different place (develop or play mode) compared to what gets shown in the compiled version (and also what is shown in the video) when using the value for the y co-ordinate as 75.

My view in Unity shows Win Text up near the top of the gameboard (about 1 square down) when I set the y-co-ordinate to 75 but... in the video and in my compiled version, the text appears a lot closer to the Player object (see screenshots below).

I've tried resetting the Win Text component using the widget in the top-right and have also tried copying all of the values for width, height, pivot, anchors etc for the Win Text object from the tutorial video but I still get this weird discrepancy.

Any ideas? I'm sure I'm just doing something stupid, but it's really bugging me as I won't know how to place things in dev mode without compiling everything first to check where things get placed!

I have attached screenshots for both the game view and the compiled version so you can see the difference in placement for Win Text - also you will see that the text seems bigger in the Game View.

By the way I'm using:
Version 5.3.3f1 Personal
(...on a pc notebook running Windows 10 Home)

Cheers

 

What script editor were you using? Thanks!
P.S. I posted the question of YouTube but then noticed the forum link to here, so I apologize for the spam.

 

MonoDevelop (not sure what spam you're referring to as this is the only reply I've seen bud)

 

Help needed please, ive just created my PlayerController script and it didnt com back with any errors, ive changed the gravity of my Rigidbody 2d to 0 and when i test the game nothing happens no moment from the UFO at all

HELP

 

Hi there,

absolute beginner- I can't even see where to click on "Download assets" for the 2d UFO tutorial

 

I haven't seen that issue before. What version of Unity are you running? And what platform were you building to?

 

Have a quick look in your player controller script, just to make sure that the FixedUpdate() method is capitalised in the correct way, otherwise it wont error, it just wont get called and thereby will not be getting or applying the input.

Code (CSharp):

1. void FixedUpdate()

and maybe check that the 'is Kinematic' is unchecked, as having this ticked will not allow your movement forces to be applied to the Rigidbody of your player.

Just a couple of thoughts. see how you get on with this.

 

Upon further research it seems that this is a result of the default UI shader being missing from the list shown here:

http://docs.unity3d.com/Manual/class-GraphicsSettings.html

This is a list of the always included shaders in a build. Can you check that list and make sure that the shader is included? Was there something unique about how this project was created?

 

Evening, should be in the asset store, in the editor 'Window > Asset store' under the unity essentials heading on the right
https://www.assetstore.unity3d.com/en/#!/content/52143

 

Everything goes great for me until I build the game and run it. I changed some things for my version of the game, such as color and pickup placement, but when I build and run, the game is exactly like the original demo version in the video. Any thoughts as to how this could happen?

 

When you go to build the game, ensure that your scene that you made the changes in is in the build settings.
if in doubt, when you have your version of the scene open, when you go to build, remove the scene in the list and add open scenes, then try building. Just a thought, see if that works. I cant put up and screenshots or exact working of the window as im not at my PC just now.

 

That did it! Thanks for the reply.

 

Thanks for this tutorial, very well explained.

 

Hi guys, first of all thanks a lot for taking the effort to make such an amzing tutorial to help beginners like me.

My problem is that the ufo does not move when i hit play and press the arror keys. I even copy-pasted the same code as provided in the instructors instructions below the video, but the problem still persists.I went through the entire forumbut couldnt find an helpful answer
It would mean a lot to me if someone could help me out here, I ll be eagerly awaiting a reply.
Thankyou

 

Morning @8Raj89,

Just wondering, are you getting any errors showing in the console when you press play, or when you press the arrow keys?

Sometimes, its worth having a double check that the objects in your scene and their properties in the inspector are the same as what are shown by the instructor. For instance check that the Rigidbody2D that you have attached to the player, had the 'Is Kinematic' unchecked, have you added a speed value in the inspector?
Also have a check that you have attached the player controller script to the player object.

Might be worth another watch through of the 'Controlling the player' video, just to double check what Matt has in the inspector compared to what you have in your project.
http://unity3d.com/learn/tutorials/projects/2d-ufo-tutorial/controlling-player?playlist=25844

I think theres also a 'Completed' folder within the project, that you can compare with also.

 

hey @8Raj89 OboShape has given you some good tips there, maybe you could post a screenshot of the inspector with the player highlighted? I'm assuming the problem will be there if you already copied and pasted the scripts.

 

when I click on the asset page "open in unity nothing happens"

 

Have you tried opening the Asset Store from within Unity editor to see if that works?

In the menu, click on Window > Asset Store

 

Hey I just finished part 5 of the 2D UFO tutorial but for some reason my player no longer moves properly. They only move to the top right corner or back down to the bottom left corner. I checked the scripts and they are correct. I rewatched the last few tutorials to see if I missed something but nothing was missing. It also doesn't roll off of the walls or anything, just moving between those two corners.

 

Any chance you can post your player controller script please. Would you be able to post a screenshot of the editor, showing the inspector when the player is highlighted please.

Just wondering, have you detached the main camera so that its no longer a child of the player?

 

I did detach the camera from the player.



And this is the script.

using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour {

public float speed;

private Rigidbody2D rb2d;

void Start()
{
rb2d = GetComponent<Rigidbody2D> ();
}

void FixedUpdate()
{
float moveHorizontal = Input.GetAxis ("Horizontal");
float moveVertical = Input.GetAxis ("Horizontal");
Vector2 movement = new Vector2 (moveHorizontal, moveVertical);
rb2d.AddForce (movement * speed);
}
}

 

Evening,

Looking at your script, for grabbing the input of the keyboard, you are setting both axis to Horizontal, thereby getting only diagonal movement in the game when you test it.

Need to change your code:

Code (CSharp):

1. float moveHorizontal = Input.GetAxis ("Horizontal");
2. float moveVertical = Input.GetAxis ("Horizontal");

to this

Code (CSharp):

1. float moveHorizontal = Input.GetAxis ("Horizontal");
2. float moveVertical = Input.GetAxis ("Vertical");

should be good to go

 

Ohh I'm such a fool. Thank you!

 

In video 1, minute 2:37 he says ""For more information on working in 2D, please see the information linked below", but I can't find the link.

I see that this happens more than once, maybe you should check that.

 

Not at my pc at the moment, but he could be directing you to the 2D section of the learn site, theres loads of 2D lessons and info there.
http://unity3d.com/learn/tutorials/topics/2d-game-creation

 

Why we rotate using

Code (csharp):

1. new Vector3(0,0,45)*Time.deltaTime

instead of

Code (csharp):

1. new Vector3(0,0,1)

for example?

 

Morning,

This is is the rotator script for the pickups?

transform.Rotate() has several different overloads, which boils down to it can behave differently based on what arguments you pass in between the braces ( ).
http://docs.unity3d.com/ScriptReference/Transform.Rotate.html

in this instance we are passing in one Vector3 value. so Rotate will use each of the X, Y, Z parts of the Vector3 value to rotate that amount of degrees around the axis each frame.

Since transform.Rotate() is called on each Update, this is called every frame.

so

Code (CSharp):

1. transform.Rotate(new Vector3(0,0,1));

this would rotate the object 1 degree on the Z axis each frame.

Time.deltaTime is the time in seconds in between update calls. (this is normally quite small,

when you use the following

Code (CSharp):

1. transform.Rotate (new Vector3 (0, 0, 45) * Time.deltaTime);

this says that we want to rotate a fraction of 45 degrees proportional to the time in seconds it takes to call each update, so effectively giving us 45 degrees rotation on the Z axis each second.
you can see more on Time.deltaTime here
http://unity3d.com/learn/tutorials/topics/scripting/delta-time?playlist=17117

Its a fair bit to take in just now, hope that helps slightly.

 

HI I have an error and I do not see what is wrong

This is my script
----------------------------------------------------------------------------------------------------------------------------------------------------------------
using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour (

private Rigidbody2D rb2d:

void start()
(
rb2d = GetComponent<Rigidbody2D> ():
)


void FixedUpdate ()
(
float moveHorizontal = input.GetAxis ("Horizontal"):
float moveVertical =input.GetAxis ("vertical"):
Vector2 movement = new vector2 (movementHorizontal, move vertical):
rg2d.AddForce (movement):
)
)
----------------------------------------------------------------------------------------------------------------------------------------------------------------
This is my error
----------------------------------------------------------------------------------------------------------------------------------------------------------------
There is no MonoBehaviour scripts in the file, or their names do not match the file name.
----------------------------------------------------------------------------------------------------------------------------------------------------------------
PLEASE HELP!!!!!

 

Hi,
I've done everything exactly like the video, and when I go to Unity from MonoDevelop, I get an error saying, "MissingReferenceException: THe object of type 'Object' has been destroyed but you are still trying to access it.". Also, when I go to edit my script, MonoDevelop says that it cannot open the project because of an unknown item type. Finally, it also tells me that I have "line endings(UNIX) which differ from the policy settings"
Please Help!

 

Morning,

Had a quick look, but I'm currently offshore and don't have pc access. But..

Your Start method should have a capital 'S', otherwise it wont get called.

In your FixedUpdate, when assigning the movement Vector2, the arguments you pass in should be 'moveHorizontal' and 'moveVertical' as these are what you are declaring in the two lines above it.

Where you are applying the force you have written 'rg2d' instead of 'rb2d'.

Ensure that your class name at the top of the script matches exactly the filename of your script, then try removing the script from your player and readding it in the inspector.

Again, sorry I've only got access via my phone, hope u get on ok

 

OboShape is correct (thanks man!). The line endings is a non-issue, just choose 'convert'. Fix the errors in your script and let us know if that helps.

 

Baffled as to why this won't work, here's my code, any help would be super appreciated, this doesn't seem to work regardless of what I've set speed to..


public class PlayerController : MonoBehaviour
{
public float speed;
private Rigidbody2D rb2d; //Must be RB2d, not RB!!


// Use this for initialization
void Start()
{
rb2d = GetComponent<Rigidbody2D>();
Debug.LogWarning("TEST START");
}

// Update is called once per frame
void FixedUpdate()
{
Debug.LogWarning("TEST");
float moveHorizontal = Input.GetAxis("Horizontal");
float moveVertical = Input.GetAxis("Vertical");
Vector2 movement = new Vector2(moveHorizontal, moveVertical);
rb2d.AddForce(movement * speed);


}

Anybody spot where it's gone wrong? Managed to get this working for th 3d roller ball game just fine, hmm

 

Managed to get it working, no idea what I did though XD

 

Hello,i have problem about controlling the player,actually i checked 3,4 times but there isn't any difference between your code and mine,i can't move my characacter movement keys wont work in my project

 

Morning,

One thing to be mindful of, is that C# is case sensitive. The monobehaviours won't have any intellisense when typing.

Where you have
fixedUpdate()

This should be
FixedUpdate()

With a capital F. You won't get any errors, it simply won't get called. Change that and see how you get on.

 

Hey guys ! I'm following the tutorial step by step and I encountered a pretty weird problem... I've done everything right up to video 3 of the tutorial, but when I test the "gravity thing", the UFO goes up, and after setting up the commands like shown in the video, the arrow keys are reversed (right arrow make the ufo go left, up arrow goes down, etc...), I saw on a different forum that it could be because of the position of the camera (x:0 , y:0, z:-10). with those settings, I see the background and the ufo "on top", also, they are in the right sorting layer. But if I change the z to (+)10, I just see the grey camera background and nothing else...

If any of you have a suggestion or even a solution, it would be much appreciated !
Thanks !

 

Hi there,

New to Unity, this is an awesome tuto. Crystal clear instructions, and - cherry on top of the cake - some good practices for coding in C#. Huge thanks !!

I successfully completed the tuto, but I just encountered a strange situation I'd like to share. It may because of a simple thing I didn't set properly but Iùd like to understand.

When I tried to set the 'Main Camera' as a child of the 'Player', I couldn't experience the camera-child-of-player game where the screen rotates with the player.
On my Unity, this forced the camera to be totally superposed with the player, including on the Z axis. It resulted in the camera preview showing the background greyish color and nothing else.

I then tried to force back the Z position of the camera in its Transform properties, to its initial value of -10. Even more strange: the value was accepted but it didn't change anything. Switching to 3D view, camera was still superposed with the player.



Any idea ?

Thanks by advance

Davvv

 

Found a solution... pretty simple actually... For those with the same problem, the issue is not the camera position, but it' "size", (I don't really get why), but the camera size can be negative, and that reverse the screen, so just make sure it is a positive number !

Also thanks to @Davvv06 for that screenshot !

 

Hi, I'm experiencing some problems in "collecting the pickups" as the pickups don't disappear when the UFO touches them. Plz help!

 

Help im a beginner and i dont know how to download the asset when i click the one i circled red, it says create a project
how can i download the asset

 

you've not really gave us alot to go on to help you out here.

Are you getting any errors showing in the console.

can you post your player controller script.
Have you got the PickUp objects set to the correct tag name?

Might be worth going through this video again, checking that not only the script is ok, but how the components and gameobjects are set up.
http://unity3d.com/learn/tutorials/projects/2d-ufo-tutorial/picking-collectables?playlist=25844

 

if you create a new 2D project in unity.
you can go to Window > Asset Store and look for the Unity technologies UFO Tutorial.
should give you the same download / open option, see how you get on there.

 

So next up with a non moving Player with out finding the problem, done the same way as in the Roll-a-Ball MiniGame exept that I've used 2D options this time (ae. Rigidbody 2D).


I don't get any errors in the program.

 

Morning,

You need to remove the tick from 'Is Kinematic' in the Player Rigidbody component.

With this tick in, you are basically saying that this rigidbody will not be affected by the physics system.

But, our player in this game IS driven via physics as we are applying external forces to it, and using these physics forces for movement.

 

Oh, great, thank you.

 

I have an issue I figure is more linked to the editor itself than the project.

I've completed the tutorial and everything works as expected. However, the bottom left portion of the UI canvas that passes through 0,0 is shown in the game. The count and win text portions of the UI function perfectly, but I can't suss out why the canvas border itself is being rendered in the game. I had something similar happen with the background border objects' outlines, but that was due to me having them selected in the editor's hierarchy. Any ideas why this is showing up?

 

is that in the scene view or the game view window?

 

I believe that was the game window, but the shown effect takes place in both scene and game windows. The scene view is to be expected, but why it's carrying over to the game view is a mystery to me.

 

It was the Tag, thanks!

 

Just out of curiosity, I clean forgot, do you have Gizmos on in the Game window?
As there is a toggle button at the top for 'Gizmos', just to the right of 'Maximise on play', 'Mute Audio' etc.

If you turn Gizmos off (just toggle the button) it should get rid of it, as there is a Gizmo in that list for the Canvas specifically as well.