Unity App: How to check available space left on Android / IOS device
OpenTK doesn't render the color of my triangle
Area2D Not Triggering Object in Godot
AnimationPlayer seek() using threading
Using Microsoft Authentication Library (MSAL) in Unity for SSO in iOS app
Why is only 1 Depth/Stencil buffer needed, even when the swap chain is tripple buffered DirectX12
How to structure a project in Monogame
Godot Invalid to get index 'x' (On Base: 'Node (a.gd)')
Copy output of custom target in one CSPROJ into another CSPROJ
Algorithm to fill arbitrary marked/selected tiles on a square grid with the smallest number of rectangles?
QUESTION
Unity App: How to check available space left on Android / IOS device
Asked 2022-Apr-16 at 14:01
I am developing a game (iOS/Android with Unity Game Engine) that requires to download resources to be stored locally on device. I wish to check free space on device to send an error message before download starts in case it's not enough.
How can I check it? I couldn't find any clear procedure on my research.
ANSWER
Answered 2022-Apr-16 at 14:01
It varies by platform so isn’t a simple answer. The free Unity plugin Simple Disk Utils handles it for you on Windows, Mac, Android and iOS and full source code is available on GitHub so you can see for yourself how it’s achieved on the different platforms.
I am learning to program a game engine which is why I followed a tutorial, with that tutorial I have gotten this far and even though my code is identical to theirs (theirs did work in the videos) its not working the way it is meant to. The triangle stays black no matter what. There is not any errors.
I have tried everything I could with my very limited knowledge of OpenTK and nothing has changed. I have searched on the web and for answer they still have not helped
ANSWER
Answered 2022-Apr-03 at 07:08
You actually assign the shader program to a local variable in the event callback function's scope. You need to assign it to the variable in scope of Main:
What I was trying to accomplish was that the Player GameObject would see if its in the area of the Flag, and if it is, the flag would rotate.
I am not sure where the issue is. I think it is probably in the second line. I provided a screenshot below if I did the setup wrong. I have looked at the other close questions asked on the same topic, but they did not answer my question.
The "Player" GameObject is the one with the script that contains the detection if its in the area2D.
ANSWER
Answered 2022-Mar-23 at 23:20
If you want to check if the Area2D is positioned correctly during runtime enable Debug -> Visible Collision Shapes.
If you want to check if _on_Area2D_area_entered is running, add breakpoints (or use print).
Did you get an error?
If there isn't a Node there, this expression will cause an error in runtime:
Since you didn't mention any error, I'm going to guess the method is not running.
If the method is not running, the most likely culprit is that - I'm guessing given then name of the method - you connected the "area_entered" signal but intended to connect the "body_entered" signal.
The "area_entered" signal will trigger when another Area2D enters the Area2D. But I only see one Area2D in your scene tree. On the other hand the "body_entered" will trigger when a PhysicsBody2D (e.g StaticBody2D, KinematicBody2D, RigidBody2D) enters the Area2D. In either case you get what entered as a parameter of the method.
Other reasons why the Area2D might not be detecting what you want include no intersection of collision_layer and collision_mask and monitoring being disabled.
And to dismiss a couple possible misconceptions:
The "area_entered" and "body_entered" trigger when the Area2D or PhysicsBody2D respectively enter the Area2D, not every frame they are inside. So rotation_degrees += 1 is not a rotation animation.
You will get notifications of anything that trigger the signals, not just the object to which you connected it. You may have to further filter, e.g. if body == self:.
I have a script attached to an AnimationPlayer node and it does some long calculations,
so in order to avoid the game engine from hanging while those calculations take place
I created a separate thread for that function,
but the seek() function doesn't update the animation despite adding update=true
so how to I get the seek() to work or is there any workaround with what I'm trying to achieve?
Edit:
I tried applied the solution @Theraot gave & modified it to loop through all the animations
like this:
1extends AnimationPlayer
2tool
3export(float,0,1,0.1) var aniTimer = 0 setget aniTimer_Changed;
4var thread;
56func sep():
7 self.seek(aniTimer,true);
8 # calculations #
910func aniTimer_Changed(new_val):
11 aniTimer=new_val;
12 thread = Thread.new();
13 thread.start(self, "sep");
14func sep(thread:Thread):
15 var AnimationList=self.get_animation_list();
16 for animation_name in AnimationList:
1718 self.current_animation=animation_name;
19 var ongoing_animation=self.get_animation(animation_name);
20 for track_indx in ongoing_animation.get_track_count():
21 for key_indx in ongoing_animation.track_get_key_count(track_indx):
22 var key_time=ongoing_animation.track_get_key_time(track_indx, key_indx);
23 self.seek(key_time,true);
2425 Translate=false;
26 property_list_changed_notify();
27 thread.call_deferred("wait_to_finish")
2829func Translate_Changed(new_val):
3031 if _thread == null or _thread.is_active():
32 _thread = Thread.new();
3334 _thread.start(self, "sep", _thread);
35
But when I run this for a big animation it gets stuck in between & the entire godot game engine hangs
I'm guessing it's a memory leak?
what am I trying to achieve?
I've actually created custom properties on a node and added those custom properties as keys in an AnimationPlayer
but these custom properties all effect position, rotation & other inbuilt properties.
so I thought by seek() I could see the end result of all them combined and then key the position, rotation & other inbuilt properties to another AnimationPlayer
ANSWER
Answered 2022-Mar-20 at 12:34
After testing, it appears to me that it works with a couple caveats:
You need to take proper care of the thread. Which I explain below.
The change will not be reflected in the Animation panel. However you should be able to see the animation take effect on the nodes.
Once done properly it works on Godot 3.2 or newer. However, starting with Godot 3.4 I could be more sloppy with how I handle the thread and it would still work.
First of all, you need to call wait_to_finish when the thread ends. Not doing it will prevent proper cleanup. If you don't have code waiting for the thread to finish, you can add this at the end of the thread code:
1extends AnimationPlayer
2tool
3export(float,0,1,0.1) var aniTimer = 0 setget aniTimer_Changed;
4var thread;
56func sep():
7 self.seek(aniTimer,true);
8 # calculations #
910func aniTimer_Changed(new_val):
11 aniTimer=new_val;
12 thread = Thread.new();
13 thread.start(self, "sep");
14func sep(thread:Thread):
15 var AnimationList=self.get_animation_list();
16 for animation_name in AnimationList:
1718 self.current_animation=animation_name;
19 var ongoing_animation=self.get_animation(animation_name);
20 for track_indx in ongoing_animation.get_track_count():
21 for key_indx in ongoing_animation.track_get_key_count(track_indx):
22 var key_time=ongoing_animation.track_get_key_time(track_indx, key_indx);
23 self.seek(key_time,true);
2425 Translate=false;
26 property_list_changed_notify();
27 thread.call_deferred("wait_to_finish")
2829func Translate_Changed(new_val):
3031 if _thread == null or _thread.is_active():
32 _thread = Thread.new();
3334 _thread.start(self, "sep", _thread);
35thread.call_deferred("wait_to_finish")
36
Using call_deferred (or set_deferred or emit_signal) allows the thread to issue operations on the main thread.
By the way, you can reuse the thread by calling start on it again after it finished. So you don't need to create a new Thread each time. So you can do this:
1extends AnimationPlayer
2tool
3export(float,0,1,0.1) var aniTimer = 0 setget aniTimer_Changed;
4var thread;
56func sep():
7 self.seek(aniTimer,true);
8 # calculations #
910func aniTimer_Changed(new_val):
11 aniTimer=new_val;
12 thread = Thread.new();
13 thread.start(self, "sep");
14func sep(thread:Thread):
15 var AnimationList=self.get_animation_list();
16 for animation_name in AnimationList:
1718 self.current_animation=animation_name;
19 var ongoing_animation=self.get_animation(animation_name);
20 for track_indx in ongoing_animation.get_track_count():
21 for key_indx in ongoing_animation.track_get_key_count(track_indx):
22 var key_time=ongoing_animation.track_get_key_time(track_indx, key_indx);
23 self.seek(key_time,true);
2425 Translate=false;
26 property_list_changed_notify();
27 thread.call_deferred("wait_to_finish")
2829func Translate_Changed(new_val):
3031 if _thread == null or _thread.is_active():
32 _thread = Thread.new();
3334 _thread.start(self, "sep", _thread);
35thread.call_deferred("wait_to_finish")
36if thread == null:
37 thread = Thread.new()
38
But! The thread will be running for the long computations, and you cannot call start on it while it is running. A simple solution is to start another one:
1extends AnimationPlayer
2tool
3export(float,0,1,0.1) var aniTimer = 0 setget aniTimer_Changed;
4var thread;
56func sep():
7 self.seek(aniTimer,true);
8 # calculations #
910func aniTimer_Changed(new_val):
11 aniTimer=new_val;
12 thread = Thread.new();
13 thread.start(self, "sep");
14func sep(thread:Thread):
15 var AnimationList=self.get_animation_list();
16 for animation_name in AnimationList:
1718 self.current_animation=animation_name;
19 var ongoing_animation=self.get_animation(animation_name);
20 for track_indx in ongoing_animation.get_track_count():
21 for key_indx in ongoing_animation.track_get_key_count(track_indx):
22 var key_time=ongoing_animation.track_get_key_time(track_indx, key_indx);
23 self.seek(key_time,true);
2425 Translate=false;
26 property_list_changed_notify();
27 thread.call_deferred("wait_to_finish")
2829func Translate_Changed(new_val):
3031 if _thread == null or _thread.is_active():
32 _thread = Thread.new();
3334 _thread.start(self, "sep", _thread);
35thread.call_deferred("wait_to_finish")
36if thread == null:
37 thread = Thread.new()
38if thread == null or thread.is_active():
39 thread = Thread.new()
40
I don't know if there are race conditions to be aware of. Take into consideration the possibility of two threads running at the same time.
But! that means that when the thread calls thread.call_deferred("wait_to_finish") that would not be the correct one. So we are going to pass the thread as parameter to the thread.
This is how my code looks like:
1extends AnimationPlayer
2tool
3export(float,0,1,0.1) var aniTimer = 0 setget aniTimer_Changed;
4var thread;
56func sep():
7 self.seek(aniTimer,true);
8 # calculations #
910func aniTimer_Changed(new_val):
11 aniTimer=new_val;
12 thread = Thread.new();
13 thread.start(self, "sep");
14func sep(thread:Thread):
15 var AnimationList=self.get_animation_list();
16 for animation_name in AnimationList:
1718 self.current_animation=animation_name;
19 var ongoing_animation=self.get_animation(animation_name);
20 for track_indx in ongoing_animation.get_track_count():
21 for key_indx in ongoing_animation.track_get_key_count(track_indx):
22 var key_time=ongoing_animation.track_get_key_time(track_indx, key_indx);
23 self.seek(key_time,true);
2425 Translate=false;
26 property_list_changed_notify();
27 thread.call_deferred("wait_to_finish")
2829func Translate_Changed(new_val):
3031 if _thread == null or _thread.is_active():
32 _thread = Thread.new();
3334 _thread.start(self, "sep", _thread);
35thread.call_deferred("wait_to_finish")
36if thread == null:
37 thread = Thread.new()
38if thread == null or thread.is_active():
39 thread = Thread.new()
40tool
41extends AnimationPlayer
42export(float,0,1,0.1) var aniTimer = 0.0 setget aniTimer_Changed
43var _thread:Thread
4445func sep(thread:Thread):
46 seek(aniTimer, true)
47 # calculations #
48 thread.call_deferred("wait_to_finish")
4950func aniTimer_Changed(new_val):
51 aniTimer=new_val
52 if _thread == null or _thread.is_active():
53 _thread = Thread.new()
5455 # warning-ignore:return_value_discarded
56 _thread.start(self, "sep", _thread)
57
Using Microsoft Authentication Library (MSAL) in Unity for SSO in iOS app
Asked 2022-Mar-16 at 09:31
We develop a bunch of augmented reality applications for our company. The applications are based on the game engine Unity (currently in the version 2020.3.7f1). Now, we're facing the point that we'd like to implement a SSO method in our apps, so every member of our company authenticates himself with his company user credentials. To authenticate the user we want to / have to use the Microsoft identity platform and thus the Microsoft Authentication Library (MSAL).
But now we stuck at the point to establish this process in Unity. We created the MSAL library dll (https://github.com/AzureAD/microsoft-authentication-library-for-dotnet), imported it into Unity and called it by using the namespace Microsoft.Identity.Client.
Due to security reasons we're only allowed to use PublicClientApplicationBuilder (which makes totally sense) so we need the web based login screen. The problem is that we can't implement a web view in Unity where the user can sign in to Microsoft and we can parse the received token out of the web view into our app for further communications.
We did a lot of internet research to find a solution but there are only some posts about MSAL in Unity in combination with Android and other posts which reference to the git repos I mentioned before.
The standard solution for mobile is the AppAuth pattern, which involves use of an integrated system browser to sign the user in. See this code example article for how that looks, so that you understand the required behaviour.
So it looks like they key thing to do with iOS is to avoid logins via webviews and tell MSAL to use an ASWebAuthenticationSession window - this Microsoft article explains how.
Why is only 1 Depth/Stencil buffer needed, even when the swap chain is tripple buffered DirectX12
Asked 2022-Mar-15 at 12:27
I am learning DirectX12 programming. And one thing that has me confused is in all the tutorials I read, they only create a single depth/stencil buffer even when triple/double buffering is used with the swap chain. Wouldn't you need a depth/stencil buffer for each frame?
Generally speaking, "intermediate resources" (such as depth stencils and intermediate render targets) are not presented on the screen.
So when one swapchain is ready to present (and you start recording next frame commands), those resources can be safely overridden, since the content is ready within the swap chain.
The only exception for those resources are generally buffers that are uploaded from cpu, for them it is needed to have one per frame (since you will start to copy data while another command list is still executing).
I'm trying to create a PC version of a cord-driven turn-based boardgame. I went for the Monogame framework in c#. I'm still learning C# and Monogame and I'm reading all about how it is important to "split" the code in the data/game engine part and the graphics/GUI part. So trying to pursue this, I have the following in mind.
Graphics/GUI
Here I define all the classes relative to the screens (game - menus), GUI components like labels and buttons and possibly even mouse and keyboard inputs (the logic being the user has to click on something in the gui in order to perform an action).
Data or Game logic/Engine
Still not even sure on how I should call this part of the project, here I would put all the logic of the game. The classes of player, cards, "IA", rules etc... would be defined here.
My difficulty is now to understand how to connect this two parts but still maintain the "loosely coupled" approach. I was thinking that maybe the objects or better the instances of the game logic part would have to subscribe to events (such as button_click) defined in the GUI part...but can I even subscribe to events of another class? Is this the correct way?
I admit I'm still trying to fully understand the event driven concept, but is this the right way of doing stuff in c# and Monogame?
I apologize for the vague topic/question but thanks in advance.
ANSWER
Answered 2022-Mar-14 at 17:18
I don't know anything about Monogame, but generally it's a good idea to organise any kind of application into layers like this, as long as you don't make the code overly complicated by doing so. Your idea to separate the UI code from the game logic sounds like a good start.
First, think of your application as an onion, with a series of concentric layers. Your proposed structure has only two layers, but that's OK. A larger application may benefit from more layers, e.g. a data access layer if you were to store the state of the game in a database, but there's no need to add extra layers just for the sake of having more layers.
Your outermost layer would contain the UI code, typically this is known as the presentation layer.
Your innermost layer would contain the game logic, typically this is known as the domain layer. A good rule of thumb for whether something belongs in the domain layer is to ask, does this represent something that a user of your application (or a player of your game) who's not a developer would recognise?
Second, remember that each layer can make calls to code in the same layer, or to code in in other layers inside it, but not to code in layers outside it. So projects in the presentation layer can have references to projects in the domain layer, but projects in the domain layer can't have references to projects in the presentation layer. If you've got circular references between the two layers then it's a sign that something in one of the layers actually belongs in the other layer.
On the second part of the question, if you want to use events then it's probably best to handle any events in the presentation layer and have the event handlers make calls into the domain layer (but disclaimer, I don't know Monogame).
Godot Invalid to get index 'x' (On Base: 'Node (a.gd)')
Asked 2022-Jan-21 at 10:30
im trying to hold a path to a game object (bat.tscn) in a script and use it to instanceate a object from a different script. Name of the script that holds the variable is called a.gd and the one that is responsible for instantiating is b.gd and the name of the variable is x. But for some reason every time i try to use the variable it gives me an error;
1Invalid to get index 'x' (On Base: 'Node (a.gd)')
2
a.gd;
1Invalid to get index 'x' (On Base: 'Node (a.gd)')
2func _process(delta):
3var SlotOne = $"res://Objects/Weapons/Bat.tscn
4
b.gd;
1Invalid to get index 'x' (On Base: 'Node (a.gd)')
2func _process(delta):
3var SlotOne = $"res://Objects/Weapons/Bat.tscn
4onready var InvManager = get_node("../a") #gets the script.
56func _physics_process(delta):
7 changeWeapons()
89func changeWeapons():
10 if Input.is_key_pressed(KEY_1):
11 load(InvManager.SlotOne)
12 elif Input.is_key_pressed(KEY_2):
13 print("2")
14 elif Input.is_key_pressed(KEY_3):
15 print("3")
16 elif Input.is_key_pressed(KEY_4):
17 print("4")
18
any ideas how can i fix this issue?
Im pretty new to the game engine so im kinda stuck here.
ANSWER
Answered 2022-Jan-19 at 13:08
also a possible explanation is that instead of using or instancing the node you are trying to access it
so first try to add the node to the main scene like this
1Invalid to get index 'x' (On Base: 'Node (a.gd)')
2func _process(delta):
3var SlotOne = $"res://Objects/Weapons/Bat.tscn
4onready var InvManager = get_node("../a") #gets the script.
56func _physics_process(delta):
7 changeWeapons()
89func changeWeapons():
10 if Input.is_key_pressed(KEY_1):
11 load(InvManager.SlotOne)
12 elif Input.is_key_pressed(KEY_2):
13 print("2")
14 elif Input.is_key_pressed(KEY_3):
15 print("3")
16 elif Input.is_key_pressed(KEY_4):
17 print("4")
18get_tree().current_scene().add_child("#the path to a.gd")
19
but anyways only the code can can tell us what is wrong
Copy output of custom target in one CSPROJ into another CSPROJ
Asked 2022-Jan-14 at 05:57
So I'm developing a game engine framework for myself in C#/.NET and I have been trying to simplify building shader files (the rendering engine consumes SPIR-V files, which I want to generate from GLSL source).
My current approach has been to use a custom .targets file which is imported into a CSPROJ, and that file defines a custom target like this:
The general idea behind this is it takes VertShader items, runs the .vert file through glslang, and spits the output .vert.spv file into the build output directory.
This works great, almost.
The problem is, if I have Project A that has a bunch of shaders, and then Project B which has a reference to Project A, I want to copy the .vert.spv shaders that Project A generates into the build output directory of Project B, but I haven't had much luck wrangling the target syntax to do what I want.
Is there any way I can get this working the way I'm describing?
ANSWER
Answered 2022-Jan-14 at 02:16
I am not sure I understand your problem correctly, but if you want your .vert.spv copied to another folder use File.Copy()
Algorithm to fill arbitrary marked/selected tiles on a square grid with the smallest number of rectangles?
Asked 2022-Jan-12 at 15:58
What I am asking here is an algorithm question. I'm not asking for specifics of how to do it in the programming language I'm working in or with the framework and libraries I'm currently using. I want to know how to do this in principle.
As a hobby, I am working on an open source virtual reality remake of the 1992 first-person shooter game Wolfenstein 3D. My program will support classic mods and map packs for WOLF3D made in the original format from the 90s. This means that my program will not know in advance what the maps are going to be. They are loaded in at runtime from user provided files.
A Wolfenstein 3D map is a 2D square grid of normally 64x64 tiles. let's assume I have a 2D array of bools which return true if a particular tile can be traversed by the player and false if the tile will never be traversable no matter what happens in the game.
I want to generate rectangular collision objects for a modern game engine which will prevent collisions into non traversable tiles on the map. Right now, I have a small collision object on each surface of each wall tile with a traversible tile next to it and that is very inefficient because it makes way more collision objects than necessary. What I should have instead is a smaller number of large rectangles which fill all of the squares on the grid where that 2D array I mentioned has a false value to indicate non-traversible.
When I search for any algorithms or research that might have been done for problems similar to this, I find lots of information about rectangle packing for the purposes of making texture atlases for games, which packs rectangles into a square, but I haven't found anything that tries to pack the smallest number of rectangles into an arbitrary set of selected / marked square tiles.
The naive approach which occurs to me is to first make 64 rectangles representing 64 rows and then chop out whatever squares are traversible. but I suspect that there's got to be an algorithm which can do better, meaning that it can fill the same spaces with a smaller number of rectangles. Maybe something that starts with my naive approach and then checks each rectangle for adjacent rectangles which it could merge with? But I'm not sure how far to take that approach or if it will even truly reduce the number of rectangles.
The result doesn't have to be perfect. I am just fishing here to see if anyone has any magic tricks that could take me even a little bit beyond the naive approach.
Has anyone done this before? What is it called? Just knowing what some of the vocabulary words I would need to even talk about this are would help. Thanks!
I expect that the result would be a list of sets of 4 integers where each set represents a rectangle like this:
First integer would be the x coordinate of the left/western edge of the rectangle.
Second integer would be the y coordinate of the top/northern edge of the rectangle.
Third integer would be the width of the rectangle.
Fourth integer would be the depth of the rectangle.
My program is in C# but I'm sure I can translate anything in a normal mainstream general purpose programming language or psuedocode.
ANSWER
Answered 2022-Jan-12 at 14:46
1Mark all tiles as not visited
2For each tile:
3 skip if the tile is not a top-left corner or was visited before
4 # now, the tile is a top-left corner
5 expand right until top-right corner is found
6 expand down
7 save the rectangle
8 mark all tiles in the rectangle as visited
9
However simplistic it looks, it will likely generate minimal number of rectangles - simply because we need at least one rectangle per pair of top corners.
For faster downward expansion, it makes sense to precompute a table holding sum of all element top and left from the tile (aka integral image).
For non-overlapping rectangles, worst case complexity for an n x n "image" should not exceed O(n^3). If rectangles can overlap (would result in smaller number of them), integral image optimization is not applicable and the worst case will be O(n^4).
Unity App: How to check available space left on Android / IOS device
OpenTK doesn't render the color of my triangle
Area2D Not Triggering Object in Godot
AnimationPlayer seek() using threading
Using Microsoft Authentication Library (MSAL) in Unity for SSO in iOS app
Why is only 1 Depth/Stencil buffer needed, even when the swap chain is tripple buffered DirectX12
How to structure a project in Monogame
Godot Invalid to get index 'x' (On Base: 'Node (a.gd)')
Copy output of custom target in one CSPROJ into another CSPROJ
Algorithm to fill arbitrary marked/selected tiles on a square grid with the smallest number of rectangles?
QUESTION
Unity App: How to check available space left on Android / IOS device
Asked 2022-Apr-16 at 14:01
I am developing a game (iOS/Android with Unity Game Engine) that requires to download resources to be stored locally on device. I wish to check free space on device to send an error message before download starts in case it's not enough.
How can I check it? I couldn't find any clear procedure on my research.
ANSWER
Answered 2022-Apr-16 at 14:01
It varies by platform so isn’t a simple answer. The free Unity plugin Simple Disk Utils handles it for you on Windows, Mac, Android and iOS and full source code is available on GitHub so you can see for yourself how it’s achieved on the different platforms.
I am learning to program a game engine which is why I followed a tutorial, with that tutorial I have gotten this far and even though my code is identical to theirs (theirs did work in the videos) its not working the way it is meant to. The triangle stays black no matter what. There is not any errors.
I have tried everything I could with my very limited knowledge of OpenTK and nothing has changed. I have searched on the web and for answer they still have not helped
ANSWER
Answered 2022-Apr-03 at 07:08
You actually assign the shader program to a local variable in the event callback function's scope. You need to assign it to the variable in scope of Main:
What I was trying to accomplish was that the Player GameObject would see if its in the area of the Flag, and if it is, the flag would rotate.
I am not sure where the issue is. I think it is probably in the second line. I provided a screenshot below if I did the setup wrong. I have looked at the other close questions asked on the same topic, but they did not answer my question.
The "Player" GameObject is the one with the script that contains the detection if its in the area2D.
ANSWER
Answered 2022-Mar-23 at 23:20
If you want to check if the Area2D is positioned correctly during runtime enable Debug -> Visible Collision Shapes.
If you want to check if _on_Area2D_area_entered is running, add breakpoints (or use print).
Did you get an error?
If there isn't a Node there, this expression will cause an error in runtime:
Since you didn't mention any error, I'm going to guess the method is not running.
If the method is not running, the most likely culprit is that - I'm guessing given then name of the method - you connected the "area_entered" signal but intended to connect the "body_entered" signal.
The "area_entered" signal will trigger when another Area2D enters the Area2D. But I only see one Area2D in your scene tree. On the other hand the "body_entered" will trigger when a PhysicsBody2D (e.g StaticBody2D, KinematicBody2D, RigidBody2D) enters the Area2D. In either case you get what entered as a parameter of the method.
Other reasons why the Area2D might not be detecting what you want include no intersection of collision_layer and collision_mask and monitoring being disabled.
And to dismiss a couple possible misconceptions:
The "area_entered" and "body_entered" trigger when the Area2D or PhysicsBody2D respectively enter the Area2D, not every frame they are inside. So rotation_degrees += 1 is not a rotation animation.
You will get notifications of anything that trigger the signals, not just the object to which you connected it. You may have to further filter, e.g. if body == self:.
I have a script attached to an AnimationPlayer node and it does some long calculations,
so in order to avoid the game engine from hanging while those calculations take place
I created a separate thread for that function,
but the seek() function doesn't update the animation despite adding update=true
so how to I get the seek() to work or is there any workaround with what I'm trying to achieve?
Edit:
I tried applied the solution @Theraot gave & modified it to loop through all the animations
like this:
1extends AnimationPlayer
2tool
3export(float,0,1,0.1) var aniTimer = 0 setget aniTimer_Changed;
4var thread;
56func sep():
7 self.seek(aniTimer,true);
8 # calculations #
910func aniTimer_Changed(new_val):
11 aniTimer=new_val;
12 thread = Thread.new();
13 thread.start(self, "sep");
14func sep(thread:Thread):
15 var AnimationList=self.get_animation_list();
16 for animation_name in AnimationList:
1718 self.current_animation=animation_name;
19 var ongoing_animation=self.get_animation(animation_name);
20 for track_indx in ongoing_animation.get_track_count():
21 for key_indx in ongoing_animation.track_get_key_count(track_indx):
22 var key_time=ongoing_animation.track_get_key_time(track_indx, key_indx);
23 self.seek(key_time,true);
2425 Translate=false;
26 property_list_changed_notify();
27 thread.call_deferred("wait_to_finish")
2829func Translate_Changed(new_val):
3031 if _thread == null or _thread.is_active():
32 _thread = Thread.new();
3334 _thread.start(self, "sep", _thread);
35
But when I run this for a big animation it gets stuck in between & the entire godot game engine hangs
I'm guessing it's a memory leak?
what am I trying to achieve?
I've actually created custom properties on a node and added those custom properties as keys in an AnimationPlayer
but these custom properties all effect position, rotation & other inbuilt properties.
so I thought by seek() I could see the end result of all them combined and then key the position, rotation & other inbuilt properties to another AnimationPlayer
ANSWER
Answered 2022-Mar-20 at 12:34
After testing, it appears to me that it works with a couple caveats:
You need to take proper care of the thread. Which I explain below.
The change will not be reflected in the Animation panel. However you should be able to see the animation take effect on the nodes.
Once done properly it works on Godot 3.2 or newer. However, starting with Godot 3.4 I could be more sloppy with how I handle the thread and it would still work.
First of all, you need to call wait_to_finish when the thread ends. Not doing it will prevent proper cleanup. If you don't have code waiting for the thread to finish, you can add this at the end of the thread code:
1extends AnimationPlayer
2tool
3export(float,0,1,0.1) var aniTimer = 0 setget aniTimer_Changed;
4var thread;
56func sep():
7 self.seek(aniTimer,true);
8 # calculations #
910func aniTimer_Changed(new_val):
11 aniTimer=new_val;
12 thread = Thread.new();
13 thread.start(self, "sep");
14func sep(thread:Thread):
15 var AnimationList=self.get_animation_list();
16 for animation_name in AnimationList:
1718 self.current_animation=animation_name;
19 var ongoing_animation=self.get_animation(animation_name);
20 for track_indx in ongoing_animation.get_track_count():
21 for key_indx in ongoing_animation.track_get_key_count(track_indx):
22 var key_time=ongoing_animation.track_get_key_time(track_indx, key_indx);
23 self.seek(key_time,true);
2425 Translate=false;
26 property_list_changed_notify();
27 thread.call_deferred("wait_to_finish")
2829func Translate_Changed(new_val):
3031 if _thread == null or _thread.is_active():
32 _thread = Thread.new();
3334 _thread.start(self, "sep", _thread);
35thread.call_deferred("wait_to_finish")
36
Using call_deferred (or set_deferred or emit_signal) allows the thread to issue operations on the main thread.
By the way, you can reuse the thread by calling start on it again after it finished. So you don't need to create a new Thread each time. So you can do this:
1extends AnimationPlayer
2tool
3export(float,0,1,0.1) var aniTimer = 0 setget aniTimer_Changed;
4var thread;
56func sep():
7 self.seek(aniTimer,true);
8 # calculations #
910func aniTimer_Changed(new_val):
11 aniTimer=new_val;
12 thread = Thread.new();
13 thread.start(self, "sep");
14func sep(thread:Thread):
15 var AnimationList=self.get_animation_list();
16 for animation_name in AnimationList:
1718 self.current_animation=animation_name;
19 var ongoing_animation=self.get_animation(animation_name);
20 for track_indx in ongoing_animation.get_track_count():
21 for key_indx in ongoing_animation.track_get_key_count(track_indx):
22 var key_time=ongoing_animation.track_get_key_time(track_indx, key_indx);
23 self.seek(key_time,true);
2425 Translate=false;
26 property_list_changed_notify();
27 thread.call_deferred("wait_to_finish")
2829func Translate_Changed(new_val):
3031 if _thread == null or _thread.is_active():
32 _thread = Thread.new();
3334 _thread.start(self, "sep", _thread);
35thread.call_deferred("wait_to_finish")
36if thread == null:
37 thread = Thread.new()
38
But! The thread will be running for the long computations, and you cannot call start on it while it is running. A simple solution is to start another one:
1extends AnimationPlayer
2tool
3export(float,0,1,0.1) var aniTimer = 0 setget aniTimer_Changed;
4var thread;
56func sep():
7 self.seek(aniTimer,true);
8 # calculations #
910func aniTimer_Changed(new_val):
11 aniTimer=new_val;
12 thread = Thread.new();
13 thread.start(self, "sep");
14func sep(thread:Thread):
15 var AnimationList=self.get_animation_list();
16 for animation_name in AnimationList:
1718 self.current_animation=animation_name;
19 var ongoing_animation=self.get_animation(animation_name);
20 for track_indx in ongoing_animation.get_track_count():
21 for key_indx in ongoing_animation.track_get_key_count(track_indx):
22 var key_time=ongoing_animation.track_get_key_time(track_indx, key_indx);
23 self.seek(key_time,true);
2425 Translate=false;
26 property_list_changed_notify();
27 thread.call_deferred("wait_to_finish")
2829func Translate_Changed(new_val):
3031 if _thread == null or _thread.is_active():
32 _thread = Thread.new();
3334 _thread.start(self, "sep", _thread);
35thread.call_deferred("wait_to_finish")
36if thread == null:
37 thread = Thread.new()
38if thread == null or thread.is_active():
39 thread = Thread.new()
40
I don't know if there are race conditions to be aware of. Take into consideration the possibility of two threads running at the same time.
But! that means that when the thread calls thread.call_deferred("wait_to_finish") that would not be the correct one. So we are going to pass the thread as parameter to the thread.
This is how my code looks like:
1extends AnimationPlayer
2tool
3export(float,0,1,0.1) var aniTimer = 0 setget aniTimer_Changed;
4var thread;
56func sep():
7 self.seek(aniTimer,true);
8 # calculations #
910func aniTimer_Changed(new_val):
11 aniTimer=new_val;
12 thread = Thread.new();
13 thread.start(self, "sep");
14func sep(thread:Thread):
15 var AnimationList=self.get_animation_list();
16 for animation_name in AnimationList:
1718 self.current_animation=animation_name;
19 var ongoing_animation=self.get_animation(animation_name);
20 for track_indx in ongoing_animation.get_track_count():
21 for key_indx in ongoing_animation.track_get_key_count(track_indx):
22 var key_time=ongoing_animation.track_get_key_time(track_indx, key_indx);
23 self.seek(key_time,true);
2425 Translate=false;
26 property_list_changed_notify();
27 thread.call_deferred("wait_to_finish")
2829func Translate_Changed(new_val):
3031 if _thread == null or _thread.is_active():
32 _thread = Thread.new();
3334 _thread.start(self, "sep", _thread);
35thread.call_deferred("wait_to_finish")
36if thread == null:
37 thread = Thread.new()
38if thread == null or thread.is_active():
39 thread = Thread.new()
40tool
41extends AnimationPlayer
42export(float,0,1,0.1) var aniTimer = 0.0 setget aniTimer_Changed
43var _thread:Thread
4445func sep(thread:Thread):
46 seek(aniTimer, true)
47 # calculations #
48 thread.call_deferred("wait_to_finish")
4950func aniTimer_Changed(new_val):
51 aniTimer=new_val
52 if _thread == null or _thread.is_active():
53 _thread = Thread.new()
5455 # warning-ignore:return_value_discarded
56 _thread.start(self, "sep", _thread)
57
Using Microsoft Authentication Library (MSAL) in Unity for SSO in iOS app
Asked 2022-Mar-16 at 09:31
We develop a bunch of augmented reality applications for our company. The applications are based on the game engine Unity (currently in the version 2020.3.7f1). Now, we're facing the point that we'd like to implement a SSO method in our apps, so every member of our company authenticates himself with his company user credentials. To authenticate the user we want to / have to use the Microsoft identity platform and thus the Microsoft Authentication Library (MSAL).
But now we stuck at the point to establish this process in Unity. We created the MSAL library dll (https://github.com/AzureAD/microsoft-authentication-library-for-dotnet), imported it into Unity and called it by using the namespace Microsoft.Identity.Client.
Due to security reasons we're only allowed to use PublicClientApplicationBuilder (which makes totally sense) so we need the web based login screen. The problem is that we can't implement a web view in Unity where the user can sign in to Microsoft and we can parse the received token out of the web view into our app for further communications.
We did a lot of internet research to find a solution but there are only some posts about MSAL in Unity in combination with Android and other posts which reference to the git repos I mentioned before.
The standard solution for mobile is the AppAuth pattern, which involves use of an integrated system browser to sign the user in. See this code example article for how that looks, so that you understand the required behaviour.
So it looks like they key thing to do with iOS is to avoid logins via webviews and tell MSAL to use an ASWebAuthenticationSession window - this Microsoft article explains how.
Why is only 1 Depth/Stencil buffer needed, even when the swap chain is tripple buffered DirectX12
Asked 2022-Mar-15 at 12:27
I am learning DirectX12 programming. And one thing that has me confused is in all the tutorials I read, they only create a single depth/stencil buffer even when triple/double buffering is used with the swap chain. Wouldn't you need a depth/stencil buffer for each frame?
Generally speaking, "intermediate resources" (such as depth stencils and intermediate render targets) are not presented on the screen.
So when one swapchain is ready to present (and you start recording next frame commands), those resources can be safely overridden, since the content is ready within the swap chain.
The only exception for those resources are generally buffers that are uploaded from cpu, for them it is needed to have one per frame (since you will start to copy data while another command list is still executing).
I'm trying to create a PC version of a cord-driven turn-based boardgame. I went for the Monogame framework in c#. I'm still learning C# and Monogame and I'm reading all about how it is important to "split" the code in the data/game engine part and the graphics/GUI part. So trying to pursue this, I have the following in mind.
Graphics/GUI
Here I define all the classes relative to the screens (game - menus), GUI components like labels and buttons and possibly even mouse and keyboard inputs (the logic being the user has to click on something in the gui in order to perform an action).
Data or Game logic/Engine
Still not even sure on how I should call this part of the project, here I would put all the logic of the game. The classes of player, cards, "IA", rules etc... would be defined here.
My difficulty is now to understand how to connect this two parts but still maintain the "loosely coupled" approach. I was thinking that maybe the objects or better the instances of the game logic part would have to subscribe to events (such as button_click) defined in the GUI part...but can I even subscribe to events of another class? Is this the correct way?
I admit I'm still trying to fully understand the event driven concept, but is this the right way of doing stuff in c# and Monogame?
I apologize for the vague topic/question but thanks in advance.
ANSWER
Answered 2022-Mar-14 at 17:18
I don't know anything about Monogame, but generally it's a good idea to organise any kind of application into layers like this, as long as you don't make the code overly complicated by doing so. Your idea to separate the UI code from the game logic sounds like a good start.
First, think of your application as an onion, with a series of concentric layers. Your proposed structure has only two layers, but that's OK. A larger application may benefit from more layers, e.g. a data access layer if you were to store the state of the game in a database, but there's no need to add extra layers just for the sake of having more layers.
Your outermost layer would contain the UI code, typically this is known as the presentation layer.
Your innermost layer would contain the game logic, typically this is known as the domain layer. A good rule of thumb for whether something belongs in the domain layer is to ask, does this represent something that a user of your application (or a player of your game) who's not a developer would recognise?
Second, remember that each layer can make calls to code in the same layer, or to code in in other layers inside it, but not to code in layers outside it. So projects in the presentation layer can have references to projects in the domain layer, but projects in the domain layer can't have references to projects in the presentation layer. If you've got circular references between the two layers then it's a sign that something in one of the layers actually belongs in the other layer.
On the second part of the question, if you want to use events then it's probably best to handle any events in the presentation layer and have the event handlers make calls into the domain layer (but disclaimer, I don't know Monogame).
Godot Invalid to get index 'x' (On Base: 'Node (a.gd)')
Asked 2022-Jan-21 at 10:30
im trying to hold a path to a game object (bat.tscn) in a script and use it to instanceate a object from a different script. Name of the script that holds the variable is called a.gd and the one that is responsible for instantiating is b.gd and the name of the variable is x. But for some reason every time i try to use the variable it gives me an error;
1Invalid to get index 'x' (On Base: 'Node (a.gd)')
2
a.gd;
1Invalid to get index 'x' (On Base: 'Node (a.gd)')
2func _process(delta):
3var SlotOne = $"res://Objects/Weapons/Bat.tscn
4
b.gd;
1Invalid to get index 'x' (On Base: 'Node (a.gd)')
2func _process(delta):
3var SlotOne = $"res://Objects/Weapons/Bat.tscn
4onready var InvManager = get_node("../a") #gets the script.
56func _physics_process(delta):
7 changeWeapons()
89func changeWeapons():
10 if Input.is_key_pressed(KEY_1):
11 load(InvManager.SlotOne)
12 elif Input.is_key_pressed(KEY_2):
13 print("2")
14 elif Input.is_key_pressed(KEY_3):
15 print("3")
16 elif Input.is_key_pressed(KEY_4):
17 print("4")
18
any ideas how can i fix this issue?
Im pretty new to the game engine so im kinda stuck here.
ANSWER
Answered 2022-Jan-19 at 13:08
also a possible explanation is that instead of using or instancing the node you are trying to access it
so first try to add the node to the main scene like this
1Invalid to get index 'x' (On Base: 'Node (a.gd)')
2func _process(delta):
3var SlotOne = $"res://Objects/Weapons/Bat.tscn
4onready var InvManager = get_node("../a") #gets the script.
56func _physics_process(delta):
7 changeWeapons()
89func changeWeapons():
10 if Input.is_key_pressed(KEY_1):
11 load(InvManager.SlotOne)
12 elif Input.is_key_pressed(KEY_2):
13 print("2")
14 elif Input.is_key_pressed(KEY_3):
15 print("3")
16 elif Input.is_key_pressed(KEY_4):
17 print("4")
18get_tree().current_scene().add_child("#the path to a.gd")
19
but anyways only the code can can tell us what is wrong
Copy output of custom target in one CSPROJ into another CSPROJ
Asked 2022-Jan-14 at 05:57
So I'm developing a game engine framework for myself in C#/.NET and I have been trying to simplify building shader files (the rendering engine consumes SPIR-V files, which I want to generate from GLSL source).
My current approach has been to use a custom .targets file which is imported into a CSPROJ, and that file defines a custom target like this:
The general idea behind this is it takes VertShader items, runs the .vert file through glslang, and spits the output .vert.spv file into the build output directory.
This works great, almost.
The problem is, if I have Project A that has a bunch of shaders, and then Project B which has a reference to Project A, I want to copy the .vert.spv shaders that Project A generates into the build output directory of Project B, but I haven't had much luck wrangling the target syntax to do what I want.
Is there any way I can get this working the way I'm describing?
ANSWER
Answered 2022-Jan-14 at 02:16
I am not sure I understand your problem correctly, but if you want your .vert.spv copied to another folder use File.Copy()
Algorithm to fill arbitrary marked/selected tiles on a square grid with the smallest number of rectangles?
Asked 2022-Jan-12 at 15:58
What I am asking here is an algorithm question. I'm not asking for specifics of how to do it in the programming language I'm working in or with the framework and libraries I'm currently using. I want to know how to do this in principle.
As a hobby, I am working on an open source virtual reality remake of the 1992 first-person shooter game Wolfenstein 3D. My program will support classic mods and map packs for WOLF3D made in the original format from the 90s. This means that my program will not know in advance what the maps are going to be. They are loaded in at runtime from user provided files.
A Wolfenstein 3D map is a 2D square grid of normally 64x64 tiles. let's assume I have a 2D array of bools which return true if a particular tile can be traversed by the player and false if the tile will never be traversable no matter what happens in the game.
I want to generate rectangular collision objects for a modern game engine which will prevent collisions into non traversable tiles on the map. Right now, I have a small collision object on each surface of each wall tile with a traversible tile next to it and that is very inefficient because it makes way more collision objects than necessary. What I should have instead is a smaller number of large rectangles which fill all of the squares on the grid where that 2D array I mentioned has a false value to indicate non-traversible.
When I search for any algorithms or research that might have been done for problems similar to this, I find lots of information about rectangle packing for the purposes of making texture atlases for games, which packs rectangles into a square, but I haven't found anything that tries to pack the smallest number of rectangles into an arbitrary set of selected / marked square tiles.
The naive approach which occurs to me is to first make 64 rectangles representing 64 rows and then chop out whatever squares are traversible. but I suspect that there's got to be an algorithm which can do better, meaning that it can fill the same spaces with a smaller number of rectangles. Maybe something that starts with my naive approach and then checks each rectangle for adjacent rectangles which it could merge with? But I'm not sure how far to take that approach or if it will even truly reduce the number of rectangles.
The result doesn't have to be perfect. I am just fishing here to see if anyone has any magic tricks that could take me even a little bit beyond the naive approach.
Has anyone done this before? What is it called? Just knowing what some of the vocabulary words I would need to even talk about this are would help. Thanks!
I expect that the result would be a list of sets of 4 integers where each set represents a rectangle like this:
First integer would be the x coordinate of the left/western edge of the rectangle.
Second integer would be the y coordinate of the top/northern edge of the rectangle.
Third integer would be the width of the rectangle.
Fourth integer would be the depth of the rectangle.
My program is in C# but I'm sure I can translate anything in a normal mainstream general purpose programming language or psuedocode.
ANSWER
Answered 2022-Jan-12 at 14:46
1Mark all tiles as not visited
2For each tile:
3 skip if the tile is not a top-left corner or was visited before
4 # now, the tile is a top-left corner
5 expand right until top-right corner is found
6 expand down
7 save the rectangle
8 mark all tiles in the rectangle as visited
9
However simplistic it looks, it will likely generate minimal number of rectangles - simply because we need at least one rectangle per pair of top corners.
For faster downward expansion, it makes sense to precompute a table holding sum of all element top and left from the tile (aka integral image).
For non-overlapping rectangles, worst case complexity for an n x n "image" should not exceed O(n^3). If rectangles can overlap (would result in smaller number of them), integral image optimization is not applicable and the worst case will be O(n^4).
