Questions tagged [c++]
C++ is a statically typed, free-form, multi-paradigm, compiled, general-purpose programming language.
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Need help on structuring my window class and game class
I'm trying to create a simple-ish game/engine/framework thing in C++, and I'm trying to come up with my own code instead of following a tutorial so I can learn to do it in a freer and more hands-on ...
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Issue raycasting when direction vector nears zero in x and z axis
I am working on a voxel game right now in OpenGL and working on implementing raycasting so I can pick blocks in my world. So far what I have created works quite well except for when the x or z axis ...
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IDXGIFactory::CreateSwapChain() vs D3D11CreateDeviceAndSwapChain - When to use which for making a swap chain?
I'm following a bunch of tutorial series on how to set up Direct3D 11 for 3D rendering, I'm focusing on the swap chain part for now. The main tutorial series I am following is the one by PardCode on ...
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Relation between an object and its renderer
Recently I decided to start optimizing code in the game development field.
I found this pacman project on github a good starting point:
https://github.com/LucaFeggi/PacMan_SDL/tree/main
I found a lot ...
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How to make intersections between road splines at runtime in Unreal Engine 5?
I’m working on a project like the game Cities: Skylines. I’ve been developing a spline-based road system and it successfully creates street curves at runtime. The current problem is how to model ...
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Octree Query - Frustum Search and Recursive Vector Inserts
Brief
I have spent probably the last year thinking about implementing an Octree data structure into my C++ game engine project for scene management and frustum culling of lights and meshes. Right now ...
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Get Points Inside Staticmesh
I am working with UE5 and want to do simulations using Lidar Point Clouds Plugin. i am building a plugin but am pretty new to C++. I want to detect points of a Pointcloudactor that overlap with ...
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Fixed timestep graphics jitter
I'm trying to implement the https://gafferongames.com/post/fix_your_timestep article but I have jitter on the position interpolation.
video of the problem
I have the following PhysX manager class ...
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Error while compiling Godot for ARM64 from source
I tried to compile Godot from source. But it is throwing an error.
I followed this tutorial:
https://docs.godotengine.org/en/stable/contributing/development/compiling/compiling_for_linuxbsd.html#doc-...
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How to create a SIMPLE Skybox using OpenGL and SDL
As the title is saying I'm trying to make a simple skybox to learn how it works. Using, of course OpenGL and SDL.
I have tried read some sites, here are them: link 1 link 2 link 3.
None of them were ...
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How to get X and Y pixels of a Image in SDL2?
I am trying to create a Voxel Space Engine In SDL2 C++. However the tutorial I am following reads the X and Y pixels of the heightmap image. I can't find a way to do this.
I am following this tutorial:...
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Converting voxels into polygons taking into account the colors
I have code to convert voxels to polygons:
...
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Strange scaling on my textures when they are upscaled or zoomed into
I am having a strange issue with my sprites, which is kind of difficult to describe, but hopefully the attached images will illustrate. I have drawn two 1 pixel lines on my sprite to help with this, ...
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Help me understand magic numbers in Chaos Vehicle plugin's torque calculation
I'm trying to understand the logic implemented in the Chaos Vehicle plugin. I need your help with following points:
1. Torque conversion
If I’m not wrong then the brake torque unit is Nm, and ...
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9 Slicing in OpenGL, want to have the center of the texture repeat instead of stretch
I have some sprites in my game, mostly though not entirely UI related, that I would like to be able to scale to different sizes without warping the borders of the sprite.
Looking around I was able to ...
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Box2d into opengl/opengl es?
I recently learned a little bit of OpenGL through learnopengl.com. I've got through the window, gone through the triangle, then shaders along with interpolation, textures, and now transform. When I ...
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What difference does it make when to update the position of a component?
I'm trying to update the position of one of background parts. The goal is to move the most left background part to the right side of most right background part when it reach the some point (in my case ...
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Sweep and Prune algorithm performance
I just managed to implement my Sweep and Prune algorithm together with AABB and it's working correctly in the first axis (I haven't implemented second and third yet to complete the collision detection)...
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Missing faces at ends of voxel chunks
I'm having problems generating faces in a chunk in OpenGL C++. For example, when I generate faces, they are generated correctly but always at the end of the chunks some faces are not generated.
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How to use screen space coordinate of the mouse to set a model position in game?
I'm trying to make a movement system in my game where you click the mouse and your model moves towards where you clicked on the landscape, my understanding is the normalized screen coords go from [-1,...
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How to set matrices for different objects, in OpenGL?
Not sure how to do it, since I'm only seeing one instance of matrix-use drawn (only one of the objects has an energy bar):
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2D Zoom to mouse point
So I'm trying to create a zoom function for my 2D camera.
The best result I've got so far is:
But something still feels off, and I just can't seem to pinpoint it.
My code currently, which simply ...
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Problems with compiling with llvm and gcc, while trying to link external libraries to EngineCore.lib and finally linking core to EngineEditor.exe
Help me I Cherno's followed game engine series and branched to add 3D capabilities. I am having issues while linking libraries, at first I just wanted to share Game Engine code with friends, but not ...
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LOD selection issue
I have been developing an LOD algorithm similar to Nanite's style. I have been developing the algorithm using Vulkan .However, I encountered problems with LOD selection. It seems that the algorithm ...
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How detect collision between object1[i] and object2[j] then do something with them in Box2D games?
I am making a simple game with Box2D and SDL2. I have GameObjects vectors for example: 1.vector of Enemy 2.vector of Bullets…
in ContactListener class i can detect collision between enemyFixture and ...
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How to resolve collision between wedge and AABB or capsule
I have a 3D world where all of my terrain uses AABBs as collision volumes (think minecraft, but not strictly cubes):
I want to add wedge pieces as a terrain option. They'll have various slopes and be ...
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Rendering sometimes blocks when updating Index Buffer at runtime
I developed a way to update my index buffer at run-time in Vulkan. Unfortunately, sometimes the rendering process blocks. I think that is caused by the update of the index buffer. The following code ...
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Mouse coordinates to world space offsetting?
so i'm trying to make a mouse to world space function, and I seem to always end up with the rays cast offsetting.
I've looked at numerous tutorials, tried numerous examples. Tried with ...
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How does Windows' Game controller properties connect to a joystick?
The situation:
We need to use a new game controller (with a joystick only) hardware on Windows IoT. In the properties of "Game Controllers", moving the joystick is visible in the displayed ...
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How to compute screen-space error for LOD selection?
I'm developing a LOD selection system and I would like to select a LOD level based on screen-space error. Could someone explain how I can accurately compute the screen-space error?
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how to pass result of Compute Shader using UAV to Target View and render it in Direct3D11?
I'm trying to get a very basic Compute Shader to write to a Texture2D and render its result to screen. so far I have written this code to bind UAV to Texture2D and pass that to my Compute Shader. but ...
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Update index buffer in Vulkan at run-time
What is the proper way to update at run-time the index buffer in Vulkan?
Many thanks
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Does an animation need to be loaded with a model?
I'm using assimp for my C++ rendering engine and I'm having difficulties with skeleton animations I've gone through a couple of tutorials/guides such as the skeletal animation chapter on learnopengl ...
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Sprite goes slow with some keys while withh others faster
I'm making a SDL and C++ game engine and I don't know where I'm failing. Here iss my code:
Game.cpp
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Should I be worried about reverse engineering revealing secrets?
I saw in the past that some games' mechanics have been revealed in details because of reverse engineering, and even the entire source code sometimes.
I'm working on a C++ game with some deeper secret ...
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How to stop scenes from running before switching between them?
So, I've been working on a game dev library using C++ and SDL2 (to test the library out I'm making a Pong clone). And now I'm writing a Scene Manager which is going good, I can switch between scenes ...
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Command Pattern or/and Event Handling porgramming paradigm?
I have created a dynamic library that contains all the tools I want my game executable to have. Additionally, I want to create a world editor/tools for my engine to be more user-friendly.
I'm ...
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How do I code realistic rocket engine plumes in Unreal Engine 5.3.2
Right now, I am programming the engine plumes for a game called Spaceflight 3D, or basically a better version of KSP2 that my team of developers are working on. Mainly to be made for my company to ...
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Matrices for OpenGL shaders
So I'm trying to figure out the model, view and projection matrices.
I can, with some effort, find my drawings (3x3x3 structure of cubes) in 3D space and it looks like:
The problem is, the cubes seem ...
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OpenGL strange depth testing
Depth testing isn't working (hopefully the images below describe, I'll gladly describe more when asked) for me, and I can't seem to figure out why.
GL initialization:
...
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OpenGL texture not working
So I'm setting up texture creationg like so, for the data 3 pixels, 1 red, 1 green and 1 blue pixel:
...
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Breakout Game Ball Reflection after hitting paddle
I am working on a Breakout game. My requirements are when the ball hit the paddle in the center it goes straight up regardless of the direction it was coming from, then for the left and right it ...
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SDL2 Events how to avoid monolithic control statement?
I'm using SDL2 in my game engine and I'm trying to figure out how I can prevent having a monolithic control statement like this:
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gdExtension C++ failed to load gdexample.gdextension in Godot 4.1
I have followed the guidelines carefully on how to use gdExtension with c++ from the official site
GDExtension with C++
Everything else seems okay but when I launched the Godot 4.1 editor, this error ...
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Singletons as presented in Game Engine Architecture by Jason Gregory
I am reading the amazing Game Engine Architecture 3rd edition by Jason Gregory, but I have trouble understanding the singleton part, more particularly the part dealing with subsystem start/shutdown...
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Software rendering - perspective correct texturemapping
I studied source code of an old game from the 90s and saw a function for perspective correct triangle texture mapping. In this function ymin and ...
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