Questions tagged [c++]

General-purpose programming language used widely in game development and CPU-intensive tasks.

Filter by
Sorted by
Tagged with
0 votes
0 answers
116 views

Path tracer -- How to debug erroneous behaviour?

Edit: I've pinpointed the problem. If I change: local_colour *= (rayPayload.color.r*mask.r + rayPayload.color.g*mask.g + rayPayload.color.b*mask.b); into ...
shawn_halayka's user avatar
2 votes
1 answer
37 views

What is a smart way to fill in the 'next' pointer of a opposite half-edge of a boundary?

I was reading this question regarding half edges from 3 years ago and the selected answer seemed pretty smart to me. However, while actually implementing it I'm confused at the part where I have to ...
ThisAccountIsForGameDev's user avatar
0 votes
0 answers
199 views

Vulkan backward-only path tracer with caustics

TL;DR -- who has discovered, in the past, a backward-only path tracer that generates caustics not needing extra convergence of any kind? I'm collecting similar algorithms, in order to fully understand ...
shawn_halayka's user avatar
1 vote
1 answer
64 views

Vulkan Syscalls

I'm working on educating myself more about computer graphics, and the more I learn and play with the technology, the more I get frustrated by the dependencies on C++ (even though I know why it exists)....
Sienna's user avatar
  • 111
-1 votes
1 answer
155 views

How to send data from a C# application to a C++ DLL?

I have a C++ graphics engine and I would like to build an editor for it in C#. I want to be able to send data from the editor to the engine such as what tool is being used and any user-defined ...
Arjan Singh's user avatar
  • 2,491
0 votes
1 answer
68 views

Triangle Rasterization Shaking Issues

I am making a Software renderer, and I noticed that there is a screen shaking like effect happening. shown in the first video: I tried doing filling without clipping against the small square, and the ...
Serilena's user avatar
0 votes
0 answers
55 views

How would you represent a mesh with tris and quads?

My understanding is that, while subdivision algorithms like Catmull-Clark can work for any polygonal mesh (including triangles) it's preferable to start with a quad mesh. Currently my rendering engine ...
Chris Gnam's user avatar
1 vote
1 answer
67 views

convert right handed matrix into left handed forward/up/right vectors

I have an openGL style matrix (column major, right handed ) that needs to be converted into two vectors (forward and up) I've managed to find, in a weird way, a solution that matches the the ...
ytrox's user avatar
  • 31
0 votes
0 answers
25 views

DirectX 11 - 3D - VBO indexing per object's buffered attributes?

If I have a series of vertices positions: (x1, y1, z1) (x2, y2, z2) (x3, y3, z3) ...
Bogdan Floareș's user avatar
1 vote
1 answer
124 views

Converting points, vectors, normals between world and object space for a ray tracer gives weird results

I'm writing a ray tracer but having trouble converting rays and normals between world space and object space. I am creating a Ray, then transforming it with transformation matrices, calculating ...
Cedric's user avatar
  • 13
1 vote
1 answer
41 views

Why does my uniform only update once?

I have a work thread function which updates the value of a float called scale: ...
lewis's user avatar
  • 21
2 votes
1 answer
1k views

OpenGL and GLUT in x64 on Windows (Visual C++ 2019)

I'm just starting to self-learn OpenGL. I have OpenGL A Primer (2nd edition) by Edward Angel and I found this useful site for setting up OpenGL with Visual Studio 2019 on Windows: https://www....
Dave's user avatar
  • 121
0 votes
0 answers
104 views

PBRT: why normalize ray's direction

In PBRT Chapter Camera Model, when describing Camera::GenerateRay(), it writes It is important that the direction component of the returned ray be normalized—many ...
Rahn's user avatar
  • 171
-1 votes
1 answer
369 views

Is a line drawn using vectors, triangles or polygons within OpenGL? [closed]

Trying to understand how OpenGL generates what is seen as images & graphics and these questions come up. Are 3D lines (which should be drawn using vectors) drawn using triangles or polygons? Or ...
AncientTides's user avatar
1 vote
0 answers
68 views

parallelizing a software rasterizer algorithm using opencl

I've written a small software rasterizer using OpenCL and would like to optimize and parallelize it more, currently I'm scanning the whole screen and see if the triangle overlaps with the pixels.. I ...
andre_lamothe's user avatar
0 votes
1 answer
174 views

Computing vertex normals in mesh triangle soup

I am using c++. I have to find vertex normal in mesh. The mesh is triangle soup. The winding order is inconsistent. I know that it is the sum of all faces normals arround the vertex. But I don't know ...
Vladimir Yanakiev's user avatar
1 vote
0 answers
75 views

Perlin noise is mysteriously ignored when the pattern is rotated 45 degrees

I am creating different coloring patterns for my CPU raytracer, such as checker, gradient, ring, stripe pattern etc. The problems started when I tried to create a perturbation pattern (of a subpattern)...
Ave Milia's user avatar
  • 121
0 votes
1 answer
200 views

Split a string of line segments into several other line segments

I have written a code to extend "n" points, constituting "n-1" lines ,to constitute more lines so you can map "m" data to "m" lines with m > n-1. This is the ...
Aminos's user avatar
  • 103
0 votes
0 answers
35 views

How do I make "attribute vec0.5" in GLSL. Sorry if it confuses

Is it possible, in OpenGL (specifically in WebGL), to use a single value from buffer for multiple shader iterations? Like to put the same element from buffer into shader attribute multiple times? Like:...
Forprix's user avatar
0 votes
0 answers
69 views

How to make sure that triangles share edges (also not overlap each other) when rendering a quadrilateral?

Here is my simple scanline-based triangle rasterizer using pure integer arithmetic. I adapted the code from this Stack Overflow answer The below code attempts to render a coloured quadrilateral by ...
Jimmy Yang's user avatar
-1 votes
1 answer
668 views

Hosting OpenGL C++ Window in C# WPF

I am following this tutorial on how to host Win32 OpenGL windows in WPF. There is also a Microsoft walkthrough on how to Host a Win32 Control in WPF that is useful aswell. The original project is from ...
Arjan Singh's user avatar
  • 2,491
0 votes
1 answer
597 views

How to rotate and move group of objects in OpenGL?

What do I have now? I have a cube consisting of 6 planes. All these planes I generate in XY coordinates and then place them by matrix transformations. I need to rotate my cube along the global axis ...
Андрей Петров's user avatar
0 votes
1 answer
97 views

How to give C++ GLUT project an Editor/UI?

I want to render my OpenGL GLUT project to a window/control in C# WPF. I have read articles online from Microsoft on how to do it but I am very confused. Does anyone have any experience with this? ...
Arjan Singh's user avatar
  • 2,491
1 vote
2 answers
147 views

Why is there a straight line between my bezier paths?

I have created a bezier curve tool and each time I draw a bezier curve segment I get a straight line between each mouse click. I don't understand why this is happening and was wondering if someone ...
Arjan Singh's user avatar
  • 2,491
1 vote
1 answer
123 views

Defining the proper sdf for this structure

I am making a procedural sdf (just a bunch of cubes) based of an image. The idea is very simple. We have a stencil image: Each texel in the image corresponds to a 3D cube. So to ray trace what I am ...
Makogan's user avatar
  • 1,696
1 vote
1 answer
263 views

3D head mesh morphing from one mesh into another using coding

I have 2 3D head images and want to morph one into the other (animation) without using blender etc. I want to do it using coding preferably using C++, C# or python(libraries are ok). I have done 2D ...
suleman butt's user avatar
0 votes
0 answers
91 views

How to delete a face using open mesh?

Pretty much the title I am trying to delete a few faces of a mesh using open mesh, like this: ...
Makogan's user avatar
  • 1,696
0 votes
1 answer
99 views

Question about using glVertexAttribArray

After defining an attribute pointer, why can't I just reuse it? I have a VAO bound so shouldn't it just accept the AttributePointer I defined with the last VAO? ...
R34P3R76's user avatar
0 votes
0 answers
70 views

ray triangle mesh intersection triangles inverted

I'm trying to render a dodecahedron triangle mesh and the triangles seem flipped or mirrored somehow. The first picture is what I should be getting, the second picture is what I'm getting and the last ...
Dodeca's user avatar
  • 1
0 votes
0 answers
71 views

16 bit SNORM format not correctly storing Z component?

I generate a normal GBuffer in my engine, and I store it using a R16G16B16A16_SNORM format like this: ...
H3XXX's user avatar
  • 115
0 votes
1 answer
136 views

Passing non-interleaved data to glBufferStorage without using glBufferSubData

I would like to use glBufferStorage to load data once into the vertex buffer. However sometimes I want to pass non-interleaved data from separate arrays like shown ...
Lenny White's user avatar
1 vote
1 answer
95 views

Stripping unnecessary data from C++ data structures before sending to GPU

I've recently been working on a particle system in my renderer and I've encountered a situation where my particle class on the C++ side has data I need to maintain my particle on that end, but that I ...
JHall's user avatar
  • 57
1 vote
1 answer
2k views

What is the Viewport?

Can someone please explain to me what the Viewport is. I've read the OpenGL wiki and doc.gl but they give me a definition that I don't understand at all. The definition they gave me is "...
Nathan's user avatar
  • 11
0 votes
1 answer
141 views

Understanding how gradient noise generation works

When attempting to compute the gradient noise derivatives I've seen the use of a function named "hash" and I don't understand its purpose (nor why they have commented that it should be ...
Frank Weslien's user avatar
3 votes
1 answer
243 views

Problem when performing IFFT for Tessendorf's ocean waves

I am implementing Jerry Tessendorf's ocean waves as described in his paper in c++ and OpenGL. I implemented two compute shaders, one for the h_tilde_0 and its conjugate, and one for the frequency ...
Facundo Pedro Astiz Meyer's user avatar
1 vote
2 answers
544 views

Reducing Cascaded Shadow Mapping Artifacts

I've been trying to get my cascaded shadow maps looking right for a while. I managed to fix the shimmering and most of the quantization artifacts, but for some reason the shadows still look really ...
Josh Lakin's user avatar
0 votes
1 answer
509 views

Can I write histogram equalization, blurring, sharpening grayscale image etc.. as shader programs with openGL?

...
Meganathan's user avatar
1 vote
1 answer
221 views

How to use trackball for rotating an camera matrix in eye frame

I have a QOpenGLWidget where I use camera transformation matrix(4,4), FOV and vectors Position(4), Up(4), Forward(4). I also have an ArcBall which I can use. I managed to implement zoom and pan by ...
nocturne's user avatar
  • 111
2 votes
1 answer
212 views

Environment map importance sampling (beginner)

beginner here. I am implementing importance sampling for environment maps in Scotty3D, a CMU CS project (but I am not a student). The task can be found here I have a problem with the sample's pdf, it ...
Pachiko's user avatar
  • 21
1 vote
1 answer
513 views

Half-Edge Data Structure with holes

I am trying to implement next/prev of edges in half-edge data structure. But I ran into this question. If there are two holes with a common vertex, will the closed loop of the edges run as in the ...
JoungCPPser's user avatar
0 votes
1 answer
410 views

My OpenGL program is not drawing filled polygons

I'm trying to learn OpenGL in c++ (I used it in Java) but I have a problem, I make a triangle, but it doesn't draw on GL_FILL and in GL_LINE it just draw a line, I can't find my mistake, I guess my ...
Yair Camborda Morocho's user avatar
0 votes
0 answers
311 views

Weird PIX behavior with DXC

Recently I've switched from FXC to DXC to compile shader model 6.0. It compiles well without errors (and runs well) but I can't debug shaders because on my netbook PIX says "failed to load PDB ...
Flone's user avatar
  • 1
1 vote
1 answer
3k views

Understanding fragment shader coordinate system

I'm trying to create an infinitely panable grid using fragment shaders (C++/OpenGL/GLSL), and I'm having a bit of difficulty understanding the coordinate system. This is my fragment shader code, ...
Andrew Woo's user avatar
0 votes
0 answers
46 views

Under what conditions does a mesh operation cause the mesh become non-manifold and how to avoid it?

I'm implementing some mesh operations (e.g. edge collapse, edge split, edge flip etc) and need to ensure applying such operations does not cause the mesh to become non-manifold. However, I'm not sure ...
Amir's user avatar
  • 241
0 votes
1 answer
59 views

Buggy behavior when applying specular reflection

I'm very new to computer graphics and trying to implement a raytracer based on the book Computer Graphics from Scratch. When I tried to add specular reflection, I don't get the output that look like ...
user avatar
0 votes
1 answer
99 views

(Ray tracing) Trouble converting to screen coordinates, objects being stretched

I followed along with Ray Tracing in One Weekend and managed to get the final output but I wanted to understand more about creating a camera and "painting" the screen since he didn't go over ...
Tippitytopkek's user avatar
0 votes
0 answers
730 views

Using multiple textures in a shader

Background: I am extracting the textures for a model with Assimp and sampling those textures in the fragment shader. I have multiple uniform sampler2D textureN ...
MasterReDWinD's user avatar
0 votes
1 answer
164 views

How to link Intel Open Image Denoise in Qt Creator and use it to denoise noisy Monte Carlo path tracing renderings?

I've been trying to link my the Intel Open Image Denoise libraries for about a week and still have no luck as of now. This could partly be because I am also novice in C++ stuff. So I need some help in ...
Amir's user avatar
  • 241
0 votes
1 answer
797 views

Spline interpolation library in cpp

Have been searching a lot for a good spline interpolation library in cpp, came across one, which is the famous Eigen library , having the unsupported counterpart for spline fitting.<Here>. I ...
Argha Chakraborty's user avatar
1 vote
1 answer
926 views

Vulkan clear color is wrong

I am following https://vulkan-tutorial.com/Introduction to get myself familiar with the Vulkan API. I have gotten to the point where my application is able to draw a triangle. But for some reason the ...
Eric's user avatar
  • 111

1
2 3 4 5