Questions tagged [c++]
C++ is a statically typed, free-form, multi-paradigm, compiled, general-purpose programming language.
4,259
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Specular lighting does not appear
I'm struggling to add specular lighting on-top of diffuse lighting and not entirely sure where I'm going wrong. I've followed the instructions given in our lecture but it just doesn't seem to be ...
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clion.sh does not exist
I have Unreal Engine in Linux launched with ./UnrealEditor
This file here ...
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3D Impulse based collision resolution not behaving correctly, what could be wrong?
I've implemented a collision resolution system based on Ian Mellington's System Cyclone and afterwards based on the Game Physics Cookbook. Currently the last one is implemented.
For some reason the ...
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Separating axis theorem implementation results in limitless extending colliders along the Z axis
I am trying to implement SAT and it works except for the fact that colliders extend infinitely along the Z axis and I can never get past them. I also have confirmed that ...
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Clarification on scene graph implementation. Adding object/node to a root node or container?
I learned about scene graphs from this chapter on learnopengl and using this I'm trying to make a simple imgui window that can display the scene graph, but one thing that wasn't made clear/I'm having ...
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Godot 3.5: Web Build using custom GDNative C++ Library does not work due to `dlopen` error and failed linking
The Problem
Currently I am trying to get the official GDNative C++ example for Godot 3.5, which can be found here working in the Web Export context. So far, I managed to export to X11.64 without any ...
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Simulated light for a 2D tile-map with just SDL2?
I'm working on a 2D tile-map RPG with C++17 and SDL2 + SDL_Image.
There are daily cycles, weekly cycles and seasons. Even a kind of weather engine provides atmosphere. The moods and times of day are ...
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9
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Unreal Engine FDirectoryWatcherModule catching multiple events per file operation
I followed this post to implement a delegate on a directory that notifies me when a change has happened (add file, delete file or remove file).
This works fine, though the issue is that for each ...
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67
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Seperating axis theorem is bugged
I am attempting to make split axis theorem for 2d collision physics. It does works, but is inaccurate. It is based off of: https://www.gamedev.net/tutorials/programming/math-and-physics/a-verlet-based-...
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What is the best way to implement a scene manager?
I'm trying to create a scene manager system for a small framework I'm writing on top of SDL2. I have implemented a scene management system that works, but I am not sure if it is structured how it ...
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Use of a Global Shaders in Unreal Engine to apply some pre-processing operations
I'm a little experienced in Unreal Engine, but I don't know the Unreal's graphics programming from a very low level. More in details I would like to know how could use an Unreal's Global Shader to ...
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How does bullet physics filter 4+ contacts in GJK?
If the bullet GJK (Convex vs convex) collision algorithm has more than four penetrating points, then how is it filtering that down to the four it needs?
What I've tried
Staring at the code, but I get ...
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1
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30
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c++ SFML Window in std::thread ignore animation
I have a main window whose loop is just in the program and a Window class in which separate sf::RenderWindow objects are created and the loops for them are in ...
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35
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Need help with artefacts when rendering shadows using a shadow map
I am encountering some weird artefacts when rendering shadows using a shadow map.
I am using C++ with Vulkan and GLSL shaders.
This is the vertex shader that calculates the ...
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IDE cannot build task core minimal.h no such file directory [closed]
I am following udemy and created a cryptraider project I added a grabber component at first it worked fine I added some c++ code to that component bt now I added two more function in the c++ file but ...
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107
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Increased CPU usage when rendering sprites
I'm creating a game in modern OpenGL, C++ but I'm having problems with optimization. Whenever I render the sprites the CPU usage starts to increase.
Code:
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44
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Vulkan Phong shader problem
Light increases its intensity as it come closer the origin model.
Vertex Shader:
...
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1
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48
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When I inherit my own GDExtension class, editor can no longer see the inheriting class
I had two classes in my game, Player and ShootableObject. Both set up as such:
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How to use the godot::String % operator for string formating of multiple values?
I tried this:
godot::String str = "values: %f,%f";
double a = 1.0;
double b = 2.0;
str = str % a % b;
Result string is:
...
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1
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In Unreal Engine 5, how do I include and use UPlayMontageCallbackProxy::CreateProxyObjectForPlayMontage in C++?
I want to play my UAnimMontage via C++, and in particular, want to make use of the conveniences of UPlayMontageCallbackProxy.
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48
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UE5; fatal error: CoreMinimal.h: No such file or directory
I am leaning to use UE5 and am following this tutorial : https://www.youtube.com/watch?v=KQgOqyYoHAs
However, when I try to compile a simple pawn class on vscode, I am given the error: "...
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How can i move actor's bounding box center in relative location in Unreal Engine 5?
This is my situation. I need align the center of the object (it's box) and the center of the scene component. I have only center of the box TVector type or FVector. How can i do it?
...
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86
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Fast Fourier Transform for Water surface simulation
I want to implement water in my game and have already done it using the Gerstner equation, but the result is not too impressive, then searching the Internet I found an article about how someone made ...
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Blitting GStreamer's decoded buffer into a Unity render texture
I'm working on a Unity native plugin that runs a gstreamer pipeline in the background, decodes it using hardware decoding, then copies the texture over to a render ...
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35
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How can I display properties/attributes of an object in an editor?
I'm learning how to make a game engine using SDL and OpenGL and I'm using imgui for the engine editor UI and I'm trying to make a properties panel that displays the properties of the selected object. ...
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1
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139
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Character overlaps with static objects
I am creating a simple OpenGL C++ game. I have a main character (green box) and some static objects (red boxes) positioned as stairs.
The problem is as green box is descending down the stairs, it ...
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89
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In C++, should POD-types be used for performance-critical parts, where many instances of the type will be handled?
(In C++)
For a type whose instances will be handled in great numbers in performance-critical areas, such as a Vector2 class representing 2D-positions, should such ...
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71
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How to do Tileable Perlin Noise in C++?
I'm currently making a game that is going to involve terrain generation. I've already tried terrain generation using FastNoise2, and it "worked" and honestly would be faster than the "...
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46
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C++ OpenGL texture coords VBO indexes changes between models
I just load 3 models using assimp into my Engine and have some problems with textures. Through some research, I realized that texture coordinates VBOs indexes changes between models, according to this ...
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38
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Box2d's SetLinearVelocity not working as expected
I'm working in a SFML and Box2d project, and I stumbled with a problem related to the linear velocity of bodies.
I've created a simplified version of the project, and the problem still persists, this ...
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105
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How to design an EventBus(guided by the pub/sub pattern)
I'm working on my game engine, and was faced with the fact, that i don't know how properly design an event system. As a pattern i choose Pub/Sub with an event bus, but i don't know where i should '...
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115
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Untraceable exception in XAudio dll
I'm developing a game using OpenGL and XAudio 2.9. For some reason I am getting an exception in release builds inside the XAudio dll. Here is the exception :
Exception thrown at 0x00007FFBB5416EF1 (...
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85
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Why doesn't multi-constraint work in this case?
The situation is as follows:
There are two objects and there are 3 constraints between the two objects.
$$
\dot{C}=(\vec{V}_{rel_a} - \vec{V}_{rel_b}) \cdot normalize(\vec{p_{a}} - \vec{p_{b}})
$$
&...
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128
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Please explain this matrices interpolation code
int rate,frac;
sint16 *frmptr[2];
frac = GetFrames(item, frmptr, &rate);
...
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34
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Change colors after drawing lines in Pangolin using OpenGL
I am drawing a bunch of lines using pangolin library. Each line has 4 vertex pairs. My goal is to give each line a different colour. Here is the code snippet I am using. In each render loop I do the ...
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How to extract data about in-game events?
I recently started playing New World, and I thought I would like to create something like a "data collector".
It would report data like: during the session,
I fired X bullets,
type of ...
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How to get Keyboard working with GameInput on PC in C++
I need some help here. I try this for a while now but it won't work and I can't find anything online.
I want to write my own input handling. At first I used XInput for gamepads and Win32 callbacks for ...
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132
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Should networking and rendering be separated in multiple threads?
I've been trying to code a multiplayer client/server prototype game using SFML's networking.
My server and client use TcpSelectors to wait for a certain amount of time for incoming packets without ...
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1
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81
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Accessing an Animation Blueprint C++ class from a Character C++ class
This is my first leap out of tutorials and building my own game so bear with me. I've been struggling with getting C++ classes to work with one another and accessing Unreal blueprints from my code.
I ...
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42
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How do I add a Mesh to an AActor at runtime in c++ in Unreal Engine 5.3
For Unreal 5.0, 5.1 and 5.2 I used the following code to do this:
...
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2D Batching and correct draw order
I'm encountering a design challenge while developing my 2D C++ OpenGL engine. I'm using a batching technique for rendering my drawable objects, and I want to ensure they are drawn in the same order ...
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1
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Bullet physics linker error
I am trying to build my project in VS, which is a copy of HelloWorld.cpp provided by Bullet.
I am getting a list of errors of sort "unresolved external symbol" when I build my project, ...
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Why are global constraints so ineffective?
There are two objects here, each with 3 constraint points.
I use formula:
$$
\lambda=(JM^{-1}J^{T})^{-1}(-JV-b)
$$
$$
\Delta V=M^{-1}J^{T}\lambda \
$$
I put the information of the three constraint ...
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Is there a logical reason for SFML's Vector2 being templated?
The game development library SFML has a Vector2 class template (and a Vector3 for that matter), which can use any arithmetic ...
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How to handle collision detection with different 2D shapes while maintaining performance? Is polymorphism appropriate?
If I'm making a small library for handling 2D shapes, should polymorphism generally be avoided? I know that it can worsen performance but it's not like polymorphism is never used in game development ...
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Selecting tiles with mouse on isometric map with height and slopes
I want to implement an isometric map with rectangular tiles similar to how it was in simcity 2000, where tiles could have different heights and tiles with different heights were connected by slopes. ...
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Vertices index access violation when loading mesh by Assimp
Currently, i am implementing the model loading feature for my game engine using Assimp. But i got an access violation error when loading my FBX model. The problem is that although the ...
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56
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How is it possible that double buffering is enabled yet the back buffer doesn't exist?
I am working on an existing OpenGL application and am currently trying to figure out why I am getting a black screen. So I am wondering how its possible that double buffering is enabled and the back ...
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50
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Sequencing interaction between rendering/animation and game logic in Poker game
I am building a two-player(CPU-User) Poker application with C++ and OpenGL. Currently the application just renders the graphics, keeps track of which button is pressed, value entered in textbox ...
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