1,087 questions
0
votes
1
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81
views
Ray-Tracing: Sphere not showing up. Is the intersection correct?
I am currently doing a ray-tracer. For a start, sphere ray-casting only. When trying to rendering a scene with three spheres two rendered as expected. The third did not. In the image bellow, one can ...
- 454
0
votes
0
answers
29
views
How to get exact position back after DDA algorithm
I have implemented the DDA algorithm in a voxel raycaster, which is working well, but I now want to cast from where it hits towards the sun, for basic shadows, but that requires "restarting" ...
- 159
0
votes
2
answers
176
views
Fastest way to accumulate (reduce) a StructuredBuffer<float> in a compute shader
I've got a RWStructeredBuffer<float> tau I'm writing to in a ray generation shader rayGen. The DispatchRays dimension are (tauWidth, tauHeight, 1) and tau has exactly tauWidth * tauHeight ...
- 18.4k
0
votes
1
answer
125
views
UI not updating during render
I've coded a small raytracer that renders a scene (based on Peter Shirley's tutorial, I just coded it in Swift). The raytracer itself works fine, outputs a PPM file which is correct. However, I was ...
- 1,826
0
votes
0
answers
43
views
How to use the same name for different types in Metal and Swift while ensuring correct alignment?
I'm writing my ray tracing game engine in Swift and Metal on my Mac. So it is very necessary to make full use of the natural optimize of Metal.
My current version can work, but it is incredibly slow ...
- 23
1
vote
0
answers
77
views
Why my Metal kernel function accepts a empty value?
I'm developing my own game engine.
It is for Apple devices so I write it in Swift + Metal.
I firstly write it in C on CPU. After I finished and tested all of the functions and I'm sure that it can ...
- 23
0
votes
0
answers
81
views
Inconsistent results with my C# Fast Voxal Traversal Algorithm (Amanatides & Woo)
I'm trying to implement this algorithm in C#, but I have very inconsistent results at the moment, and I can't figure out why.
Here is my current implementation :
public static IEnumerable<Point> ...
- 21
1
vote
0
answers
67
views
How to correctly add point light and reflection values in an ray tracing system?
I'm working on a small ray tracing project and I'm trying to add a point light system to my rendering engine. Here's an excerpt of my main ray_color function, which calculates the color of a ray based ...
- 11
-3
votes
1
answer
85
views
Device doesn't have PIPELINE_EXTENSION_NAME even though rayTracingPipeline is supported
When I give pointers to extension structs to be filled in when I call vkGetPhysicalDeviceFeatures, the rayTracingPipeline flag is 1, meaning it should be supported, and pretty all the flags in ...
- 16.3k
0
votes
0
answers
19
views
How to render the light source itself in raytracing?
I'm following some articles to render a simple scene consisting of several spheres and light source. My question is, how would you render the light source itself? For example, a round light bulb, or a ...
- 41
0
votes
1
answer
131
views
Draw each rendered scanline in windowed raytracer? [closed]
I'm refactoring a raytracer to have a window pop up that shows each scanline produced instead of having to wait for the ppm image to be rendered and open it with some ppm viewer.
I've been advised to ...
- 185
1
vote
1
answer
152
views
Smart pointers vs raw pointers for raytracer [closed]
I wrote a toy raytracer following the popular raytracing in one weekend series that uses heavily shared_ptr for more or less everything. The codebase in nice and tidy but extremely slow (a 400x400 ...
- 185
2
votes
0
answers
93
views
How to convert camera space to world space given Camera Vector and Ray vector in camera space
How can i convert a camera space vector to world space, given the camera direction vector, and the camera space vector?
All vecs are normalized 3D vectors, and the camera space projection is correct ...
- 29
1
vote
3
answers
189
views
Parallelized ray tracer is slower than single thread version
i'm writing a raytracer based on the popular raytracing in a weekend series.
i've tried to parallelize it by dividing the image in slices and give each thread a portion of the image to render:
void ...
- 185
-4
votes
1
answer
64
views
Is there a way to find out why the front faces are culled instead of the back in my procedurally generated 3D model?
I have been working on procedural generation of 3d models using threeJS. I have been able to successfully procure a model with the help of marching cubes algorithm and smoothened it with the help of ...
0
votes
0
answers
93
views
PBRT's hello world
I wanted to try to use the code of the Physically Based Rendering Toolkit (PBRT). So I cloned the repo, built the project and then tried to do a "hello world"
#include <iostream>
#...
- 636
0
votes
0
answers
19
views
Raytracer mesh not centering correctly
I have had this bug for a while, and I tracked it down to the way I am trying to rotate and then center a mesh in my raytracer. The way I figured it out is the meshes need to be rotated first, and ...
0
votes
1
answer
85
views
Is there a pyramidal beam - AABB intersection algorithm?
I'm trying to figure out an approach for checking whether or not axis aligned bounding boxes (AABBs) intersect with a pyramidal beam. Is there a known algorithm for this? Does anyone have an idea how ...
- 83
0
votes
1
answer
133
views
Raytracting in One Weekend OpenMP Parallelization
I've been following the tutorial series "Ray Tracing in One Weekend" which seems relatively canonical in terms of learning ray tracing.
I've been trying to speed up the code using OpenMP but ...
1
vote
0
answers
36
views
Is shading materials in ray tracing/path tracing associative and/or commutative?
I have been fiddling around a ray tracer in the tutorial Ray Tracing: The Next Week. And I noticed that the author simply multiplies attenuation of materials hit in each intersection:
ray scattered;
...
0
votes
0
answers
144
views
Is there a more efficient Ray intersection algorithm for rounded Boxes?
I'm currently trying to figure out a rendering approach for implicit geometry which involves a ray intersection algorithm for oriented rounded box primitives. It's just a small toy project and I'm not ...
- 83
2
votes
3
answers
71
views
How do I pass an Java Object to my OpenCL kernel?
I'm developing a Java RayTracer with OpenCL. Im currently using JOCL to access the API. So, now I'm trying to make the user interact with the camera, and my plan was to make a camera that would be ...
0
votes
1
answer
61
views
Raytracer Reflection: object is dimmed, not reflective
i'm implementing a simple raytracer and now I'm trying to implement reflections. but the object are just dimmed, there is no reflection. that's how it looks:
my scene
Here is my code for the ...
- 7
0
votes
0
answers
223
views
My DX12 ray tracer is crashing and i can't figure out why
I am trying to code a real-time ray tracer application using DirectX12. I should say that I am almost a complete beginner about graphics programming and have very little idea on what I'm doing (if you ...
- 11
3
votes
0
answers
148
views
Is there a curve-triangle intersection algorithm?
The problem of calculating the intersection between a ray and a triangle is well-known. For this there exists e.g. the Möller-Trumbore intersection algorithm.
For my application I need an algorithm ...
- 31
0
votes
1
answer
327
views
Torus intersection formula for raycasting?
I'm currently learning raycasting and I was able to render several objects in terminal using functions like this (vec3 is just a struct with xyz variables) :
float hit_sphere(vec3 center, float radius,...
0
votes
1
answer
103
views
Problem with total internal reflection in ray tracing (Ray tracing in a weekend)
I'm following the steps in the book 'Ray Tracing in a weekend' and I'm having some problems with the section 11.3 Total internal reflection. When I try create the image I get this result:
This is the ...
0
votes
0
answers
90
views
Incorrect ray direction calculation
The problem I am having is that the calculation of ray direction for my ray tracer is not correct and therefor the scene is not renderd as the ray directions are not projected in the expected ...
1
vote
0
answers
48
views
templated class segfaults when using inheritance [duplicate]
I am currently working on a raytracer, and I am trying to output the result using multiple ways at the same time (only through PPM format and using SFML atm).
To achieve that, I wrote an IOutput ...
- 47
0
votes
1
answer
250
views
How to correctly index into an index buffer in DXR
I am working through a simple ray-tracing application with DXR. I am using a single vertex and index buffer for multiple geometries, and the acceleration structure is handling that perfectly. ...
- 43
0
votes
0
answers
111
views
Why is my VkPipeline returning null even with all other values being good?
The code:
VkPipelineLayoutCreateInfo pipelineLayoutCreateInfo{ VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO };
pipelineLayoutCreateInfo.pushConstantRangeCount = 1;
pipelineLayoutCreateInfo....
- 1
1
vote
1
answer
204
views
How is the ray_color(...) (ray trace function) correct from the "Ray Tracing in One Weekend: Part 1" book?
The trace ray (named ray_color in the book) function from the ray tracing in a weekend book looks like this
color ray_color(const ray& r, int depth, const hittable& world) const {
// ...
1
vote
1
answer
104
views
How to convert raw RGB luminance using OCIO
I'm currently working on a raytracer in C++, and am struggling to understand color transforms/spaces. I'm trying to use AGX via OCIO, but I cant find any solid explanations as to how I'm to apply the ...
- 77
0
votes
1
answer
198
views
How can I send large arrays of objects to a fragment shader using WebGL2?
For a university assignment, I've written a raytracer in JavaScript using a Canvas with a 2D context. To make it faster, I'm converting it from a 2D context to a WebGL2 context.
In the original code, ...
- 3
0
votes
0
answers
236
views
VK_ERROR_DEVICE_LOST on create acceleration structure and possible ways to debug it
i'm trying to make a ray tracer in vulkan, so i need to make an acceleration structure. i've seen similar questions and understood that the VK_ERROR_DEVCE_LOST shows up on calling vkQueueWaitIdle when ...
- 1
0
votes
0
answers
230
views
How can I use (resource) barriers to sync access to a `RWTexture2D` between different shaders?
Here is my situation: I have a RWTexture2D<float4> out which will always be in state D3D12_RESOURCE_STATE_UNORDERED_ACCESS and another RWTexture2D<float4> tex (initialized in state ...
- 18.4k
0
votes
0
answers
88
views
Simultaneous access to the same pixel in a ray generation shader - is it safe?
I have a ray generation shader which adds a random number of rgb values to a RWTexture2D<float3> output : register(u0) at random pixel locations:
[shader("raygeneration")]
void foo()
{
...
- 18.4k
1
vote
0
answers
177
views
Path tracer fireflies
I'm trying to make a path tracer but I have no idea how do I solve fireflies problem when sampling from env map. Env maps usually contain really bright and small areas and when some ray hits that ...
- 11
1
vote
1
answer
214
views
CreateStateObject returns E_INVALIDARG - How to figure out what precisely the cause is?
I'm trying to compile and run the code published on https://github.com/boksajak/referencePT of the reference path tracer described in Raytracing Gems II. It is based on https://github.com/acmarrs/...
- 18.4k
0
votes
1
answer
178
views
BVH structure not working in shaders but work in cpp code
I have been learning about rendering and after learning about raytracing I wanted to explore acceleration structures and write my own BVH implementation. I am testing it out by dispatching shadow rays ...
- 19
0
votes
1
answer
43
views
Render only the front faces of 3D objects in a raytracer
I'm working on a raytracer implementation in Python, and I want to ensure that only the front faces of 3D objects are rendered. Currently, the raytracer renders both the front and back faces, and I ...
- 11
-1
votes
1
answer
95
views
Implementing a Simple Caching Mechanism in Python for Ray Tracing
I'm working on a ray tracing project in Python and I'm looking to implement a basic caching mechanism to improve performance. I want to avoid using functools and classes.
custom_cache = {}
def ...
- 11
0
votes
1
answer
56
views
Raytracer Camera Look-At Issue: Limited Rotation Range?
I'm working on a raytracer, and I'm facing an unexpected behavior with the camera's look_at feature. It appears that the camera's rotation is limited to a certain range, and when I set look_at to vec3(...
- 11
0
votes
0
answers
117
views
Creating a Custom Shape in Python Ray Tracing Project
I'm working on a ray tracing project in Python and want to include custom shapes, such as a human body, in my scenes. While basic shapes like spheres and cuboids are straightforward, I'm struggling to ...
- 11
2
votes
1
answer
177
views
Implementing Frustum Culling in Python Ray Tracing Camera
I'm working on a ray tracing project in Python and have encountered a performance bottleneck. I believe implementing frustum culling in my Camera class could significantly improve rendering times.
...
user23205098
2
votes
1
answer
295
views
Efficient Rendering Optimization in Ray Tracing - Avoiding Full Scene Rendering
I'm currently working on a ray tracing project using Python and have encountered performance issues with rendering the entire scene each time. I want to implement a more efficient rendering approach ...
user23205098
0
votes
1
answer
84
views
Ray tracing: Sphere have an X mark from light source instead of a circle
I am trying to do ray tracing on a couple of spheres. However, when I put a light source directly in front of a circle, I get a X mark (X mark with 3 lines instead of 4) instead of a circle lighting ...
- 29
0
votes
0
answers
99
views
Multithreaded program using 8 threads takes more time to run than 2 threads
I am trying to convert a single threaded raytracing program to a multithreaded program. My idea is the following:
Create a new thread for processing the color of each pixel. Since each pixel has 1024 ...
- 2,025
0
votes
1
answer
1k
views
Creating a window just to get its framebuffer?
I've been writing this small ray-tracing engine in C/C++, and so far I've got basic functionality, where the finished image gets written to an image. However, I want to be able to create a window and ...
- 124
0
votes
0
answers
28
views
Issue with Vector Subtraction in Ray Tracing Python Code
I'm working on a ray tracing project in Python and encountering a TypeError that I'm having trouble resolving. The error occurs in the vec3_sub function, where I'm trying to subtract two vectors. Here'...
- 11