Questions tagged [c++]
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159
questions
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9 views
how to convert halfedge datastructure to work with GTS
I want to import an object with extension ".obj" as halfedge data structure. and simplify it using GTS (GNU Triangulated Surface Library. )
How to convert halfedge data structure to ...
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0answers
12 views
how to use half-edge data structure with gts gnu
There is any way to use GTS(GNU Triangulated Surface Library) with Half-edge or Combinatorial maps data structures ?
I want to use GTS simplification with the above mentioned data structures
I ...
0
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0answers
36 views
Efficiently transferring only needed parts of the vertex data to the GPU (C++/OpenGL)
I have a situation, where I have an array of vertices on the CPU side, for which, besides rendering-relevant data, like their position, I have a lot of other data at each vertex. All vertex data is ...
1
vote
1answer
77 views
Render fragments with uvs outside (0,1) range as transparent
I'm rendering an image onto a mesh. And I need to render fragments with uv coordinates that fall outside (0,1) range with full transparency. In the code below I'm specifying a border color with zero ...
2
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0answers
52 views
Atmospheric scattering band/seperation artifact
I am currently experimenting with some atmospheric scattering in glsl in my OpenGL engine.
I am experiencing a strange phenomena where a strange band / separation artifact appears along the middle of ...
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0answers
40 views
How to deallocate memory for vertex buffer objects
I have a class that handles loading buffers for a mesh:
...
0
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1answer
51 views
Drawing a square using glDrawArrays with GL_TRIANGLES
I used a version of the following code to draw a triangle using glDrawArrays with GL_TRIANGLES, per Anton Gerdelan's very nice tutorial here:
Hello Triangle !
It draws a nice triangle.
I have modified ...
0
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0answers
25 views
What do you do when the root skeleton is not defined in a gltf file?
Cross posting from stack overflow:
Reading the source code of tinygltf I see this:
...
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0answers
52 views
Different OpenGL behaviour on Windows and Ubuntu
While porting this project with slightly modified code to Linux I ran into some weird behaviour.
On Windows it runs just fine (https://youtu.be/xH6Dc6xOuow).
But on Ubuntu it shows some weird ...
1
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1answer
21 views
Why are these 2 buffers joint while extracting glTF information?
I am using tinyGLTF to parse gltf files and then render them in my program.
I am currently during the third example in this page.
In particular I am trying to extract the 2 animation buffers:
My code:...
1
vote
1answer
51 views
Max number of elements in a vertex attribute
I want to load a vertex buffer with vertices of struct Vertex:
...
0
votes
1answer
35 views
In place sorting of a half edge DS?
Cross posting from SO because I didn;t know where to put this question.
I have an implementation of the half edge and I am trying to sort the edges such that edge n+1 is the pair of edge n.
Setup
I ...
1
vote
1answer
37 views
draw on cubemap with help of geometry shader each triangle covers each cubemap face (why??)
I want to do some complicated stuff but have problems with my geometry shader / FBO bindings.
To hold it as easy as possible I reduced the code to a minimum. If this works, I could continue the hard ...
2
votes
2answers
67 views
Using array of textures in DX12
I managed to create code, working correctly as Texture2DArray in hlsl by using single ID3D12Resource and binding it as D3D12_SRV_DIMENSION_TEXTURE2DARRAY with constant array size.
...
2
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0answers
31 views
Global root signature crash
I have a problem with RTPSO creation. Using local root signatures for each of rgs (ray generation shader), chs (closest hit), miss is working correctly. However, for performance sake, I want to use ...
2
votes
0answers
33 views
multiple Quaternion slerp inverse to calculate relative coordinates
I am creating a 3D spherical curved display (only a part of a sphere). The camera usually is inside of this sphere. This display has texture coordinates. The image below shows the display with its ...
1
vote
1answer
83 views
Raytracer help - Background color writing over some colors?
I'm implementing Peter Shirley's "Raytracer in a Weekend: The next week" and I'm having some trouble with rendering a scene with a light. I'm not sure if the issue is the background color or ...
0
votes
1answer
39 views
Hit group - export already defined
I am getting this error when creating RTPSO with multiple hit groups:
...
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0answers
70 views
How to use RWStructuredBuffer
Edit: I managed to get code compiling, but it doesn't work, so I changed question a little bit.
Below code is working fine as read buffer, but I cannot make it to work as read-write buffer (...
0
votes
1answer
36 views
Paint pixels on the image around the cursor for painting application
I'm trying to create a simple painting application. And I was wondering about an efficient way to draw pixels on the screen.
I have a pixel struct:
...
0
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2answers
104 views
Get normalized device coordinate of an image pixel
I have an image rendered to the screen, and based on the normalized device coordinates of the cursor I would like to pick the pixel of the image under the cursor.
Say the image has four channels, I ...
2
votes
2answers
108 views
Why negate z when constructing projection matrix OpenGL
I constructed an orthographic projection matrix from this article on scratchpixel.com:
...
2
votes
1answer
121 views
Dynamic Ray-Triangle Intersection
I am working on a small simulation software which has a 3D Renderer that is using OpenGL. I render objects to the screen as triangle meshes. To be able to select the triangles on the screen, I have ...
1
vote
1answer
84 views
How do you loop through the contents of a buffer in DX11?
Okay, so I'm currently using the IAGetVertexBuffers() method and I'd like to loop through some of the returned buffers to verify the contents.
However, I'm kind of new to DirectX and C++ in general. I ...
3
votes
1answer
179 views
How to unproject cursor with orthographic projection
With perspective projection we can unproject screen space coordinates of the cursor to the near and far plane of the frustum and calculate the direction of the ray through the cursor.
...
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0answers
47 views
What modern C++ Unit Testing Framework do you use for highly parallel image, 3D and higher dimensional matrix processing workloads? [closed]
Most of the existing open-source libraries such as OpenCV, Tensorflow, and Pytorch use Google Test. I would like to know about strong alternative testing frameworks that thrive under a similar ...
3
votes
1answer
170 views
Shader that transforms a mercator projection to equirectangular?
I am new in the OpenGL - GLSL and trying to make a shader that taking a mercator projection texture as a source and converting it to an equirectangular projection texture.
Sample input: (1024x1024)
...
1
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0answers
45 views
What is the projection matrix of reverse (Byzantine) perspective?
I would like to construct a projection matrix for reverse perspective.
I'm using OpenGL and tried to modify concepts from this excelent tutorial.
I came up with:
$$
\begin{bmatrix}
2\frac{(near-M)}{...
1
vote
1answer
37 views
Do we have OpenGL shaders write out the intermediate *.o-esque file on first compile so that we can skip compiling them in run-time every single time?
Shaders get compiled during runtime every single time an app starts. I understand the reasoning for this is that there are so many GPU architectures out there that it does not make sense to ship pre-...
1
vote
1answer
63 views
Passing mat4 array to GLSL succeeding but producing GL_INVALID_OPERATION
I'm currently passing an array of bone positions to GLSL for a skeletal animation shader; the positions are passing successfully but producing a GL_INVALID_OPERATION error.
I'm passing the matrices ...
2
votes
1answer
67 views
Off by one error when creating face indices
I seem to have an off by one error when creating the indices for the faces of a sphere and I can't understand where.
The exact problem is that when I try to calculate the normals of each face a dark ...
0
votes
0answers
84 views
Queue from a family queue that supports presentation doesn't work [Vulkan]
I'm following this tutorial on Vulkan and I tried to see if it actually worked with different queues for drawing and presenting the image of the triangle. My GPU supports presentation with every queue ...
0
votes
1answer
191 views
Feeding acceleration structure to the GPU then raytracing it in a compute shader?
I want to use Vulkan's rasterization to solve for the visibility problem, but once that is done I want to do shading, reflection and transmission through a raytracer which also runs on the GPU. With a ...
1
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0answers
61 views
How do I produce a metallic surface in ray tracing?
I can't manage to produce a metallic looking sphere despite trying many things. I have the basics working, i.e shadows, refraction etc. but I'm not sure what combination of these will allow me to ...
0
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0answers
34 views
Write CPP program, DFA and NFA diagram for DFA accepting string with length 5 and starting at 0 , ending at 1 input(0, 1)
I am having trouble in making this program and DFA:-
Write CPP program, DFA and NFA diagram for DFA accepting string with
length 5 and starting at 0 , ending at 1 input(0, 1).
1
vote
1answer
100 views
glBindImageTexture returning INVALID_VALUE
I am currently having an issue with OpenGL as I am trying to load some vector information into a 3D texture. Currently, I am developing in OpenGL 4.6 which should support Image bindings.
this my ...
0
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0answers
26 views
Want to add strafe function
I’m trying add strafe function in my program, i tried everything i can but still i was unable to get desire output! Can anyone please tell me how can i add strafe function in my program?..
is there ...
0
votes
0answers
29 views
Loop subdivision, certain areas converging towards degenerate geometry
I coded loop subdivision and ran it on a cube with triangle faces. I noticed this:
I am using doubles to represent my vertex positions, I am not 100% sure these are caused by floating point ...
1
vote
1answer
111 views
How to handle Half edge boundary edge iteration from vertex?
Ok so let's say we have a portion of a mesh that looks somewhat like this:
A triangle fan with one of the triangles removed. If that triangles was not removed, we could get all the edges adjacent to ...
1
vote
0answers
48 views
Implementing the derivation of the Smith Shadowing function for arbitrary distributions
I'm trying to implement the derivation of the masking function G_1 by Smith.
The appendix of Walter et al 1, Hammons presentation 2 and this research paper 3 talk in detail about it and I feel as I do ...
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0answers
42 views
void* D3D11_MAPPED_SUBRESOURCE::pData to OLE_COLOR* possible?
I have found the following from this link
enter link description here
pData
Type: void*
Pointer to the data. When ID3D11DeviceContext::Map provides the
pointer, the runtime ensures that ...
0
votes
0answers
18 views
Explanation request for a GDI code block
I have a small old code snippet where I am not sure what is actually someone wanted to do. As I am not doing and trial and error guessing dvelopment. I have to be certain about the purpose could do ...
0
votes
0answers
72 views
Non linear transformation of vector graphic
I want to do a non-linear transformation of a svg in python. My specific problem is to transform a rectangular svg image into a frustum like image, for which i have a mathematical equation of the form ...
0
votes
0answers
33 views
After making any 3D model using Opengl how to export it's data in .dae file?
I'm trying to make simple 3d modeling program in c++ with Opengl. So I don't know how to transfer/convert/export or save data of 3D model in .dae file.
NOTE:- 3d model is made using Opengl ...
0
votes
2answers
141 views
Why is my raycaster so slow?
I'm trying to write a raycaster similar to Voxlap, but it's many times slower. I've tried octrees, but the performance gains are marginal- only 10 to 20 percent. I use the algorithm from this site: ...
2
votes
0answers
24 views
Projecting a point on a Freefrom surface
My first issue is getting a set of planes and a set of points as input, an find the projection of the those points on the nearest plane.
That was pretty easy, where i just calculate the normal of the ...
1
vote
1answer
163 views
Program to make “Pieslice” without using library function?
As we know in C/C++ there is "graphics.h" header file with the help of which we can do graphics programs in C.
There is a function pieslice in that header file,its syntax is:
...
2
votes
1answer
89 views
Calculate Normals of Boolean Operation for Ray Tracer
I'm working on a small ray tracing project in my free time and I'm currently implementing boolean operations for spheres.
My code is setup to calculate the intersection points of each of the spheres ...
2
votes
1answer
77 views
Represent shape as particles
Input: Triangles which make up an arbitrary shape. Each triangle is represented by 3 3D points.
Output: A set of particles which fills up the inside of the object (see image).
I have read the ...
1
vote
0answers
26 views
Mitsuba builds targets with scons but throws “undefined symbol” error when trying to render scene
I am trying to implement a custom add-on for Mitsuba, but when I use the Heightfield I have defined in another function call(WaveBrdfAccel) in main.cpp it compiles without any problems but when I try ...
