Questions tagged [rendering]

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40 views

Using Software Rendering to make an External GPU

I was looking at the Raspberry Pi 4 specs and realized that running a software renderer on the pi could get some decent graphics. By using USB ports and Ethernet ports, I think I might be able to send ...
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1answer
21 views

What can be reduce in peripheral circle and increase in foveated cirle?

Foveated rendering, is definitely one of the newest fields of real-time graphics rendering. The main goal of foveated rendering is reducing rendering cost to increase frame-rate without perception ...
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2answers
53 views

Why do some videos look smoother and others don't on the same monitor

I have a Dell monitor with 60 Hz refresh rate and therefore games playing on it are not very smooth as compared to 120 hz. But when I open videos on YouTube of the same game on the same monitor, some ...
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1answer
64 views

What effects are used to light this scene?

I am interested how that image on the right of the slider (just albedo) can produce such a realistic looking scene as the scene on the left. What effects (at a minimum) does this scene seem to be ...
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1answer
75 views

Screen Space anti aliasing?

I have the following challenge. I am given a black and white image with rasterized lines. Given this input, I want to extend the edges to cover more than one pixel and antialias the edges. My first ...
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0answers
37 views

I am trying to find a clip about the art of old computer graphics

I have saw a clip where a guy talked about the art of squeezing some nice graphics into a very small space that was available on old computers. Come to think of it, it sounded something like today's ...
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1answer
84 views

Stylized math like rendering?

How can I render plots and graphics that mimic how mathematicians draw diagrams? For example Look at this shirt: The diagrams represent 2D and 3D shapes, however they have characteristics of human ...
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1answer
122 views

Why is the image from the CUDA version not as sharp as the CPU version?

I am extending Roger Allen's Ray Tracing in One Weekend in CUDA (and also here) by following Peter Shirley's Ray Tracing: The Next Week; specifically Image Texture Mapping. The image I obtain from ...
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0answers
47 views

Can ambient light reflection of a surface be larger than diffuse reflection?

According to Phong's reflection model, there are different reflection constants (k) and different intensities of the light source (i) for ambient, diffuse, and specular terms: $I_p=k_ai_a+\sum_{m \in ...
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1answer
137 views

Energy redistribution sample re-integration

I'm implementing ERPT-style energy redistribution of primary samples within a pathtracer. Specifically, to improve the sampling of defocused areas. The core algorithm does two things: If sample ...
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1answer
30 views

Rendering part of the scene inside bounding sphere

In this video https://youtu.be/0ckE-CZpXAo?t=445, it's suggested to render onto a sphere instead of screen quad to save computation time on lighting calculations. So you create a bounding sphere for ...
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1answer
47 views

How to pass only the needed portion of the data calculated in a fragment shader to another fragment shader?

I have an image and I want to draw an arbitrary number of objects on that image. The center coordinates of those objects are calculated inside a fragment shader after series of image processing ...
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1answer
54 views

What's the simplest, open, animation format?

I have an obj parser that handles triangle meshes specifically. I want to extend it (and the rest of my system) to handle animations as well. However, I don't think I am ready to tackle the glTF ...
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1answer
102 views

Drawing a cube and wireframe opengl

I'm trying to render a cube and it's wireframe together using OpenGL The main function is this: ...
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1answer
161 views

Why does my image has a square pattern in cuda path tracer?

I am writting a path tracer in cuda following the Shirley's book. I am having a square pattern as an output. The size of the block change if I change the block dimensions. For this image, the block ...
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1answer
78 views

What is the simplest way to create basic 3d/isometric style images programatically like autocad/blender

I need the simplest route to programatically, via command line, through python or node, to create something like this using basic input of distance and 90 degree turn etc: https://i.imgur.com/SdY02gQ....
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1answer
63 views

Reference for Inverse Rendering

I'm not sure this is the right place to ask for this reference but it's worth the shot since it is graphics related. I'm looking for the very first paper describing what "Inverse Rendering" -...
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1answer
41 views

What is 2D BRDF Slice/Lobe?

I was recently trying to read some rendering papers and textbooks. The word 2D BRDF slice/lobe is often used while no official definition is provided. I know that BRDF is a 4D function of input ...
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1answer
54 views

How can I make a graphics demo without a frame buffer?

I am programming a microcontroller - a tiny 8 bit computer that has about 100Mhz - 300Mhz CPU clock speed and 64K application RAM (actually ROM), but only a tiny amount of RAM (6K) - nowhere near ...
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1answer
249 views

What are the use cases for multiple render passes?

From what I understand of Vulkan, we have a render pass with its associated image resources and subpasses, and each subpass accesses those resources and may synchronise with previous subpasses to ...
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1answer
47 views

Albedo image map to color's Light Reflectance Value (LRV)

In many datasets in the literature of both Computer Vision and Computer Graphics there is the albedo map of a scene represented as RGB images, which in principle corresponds to the diffuse reflecting ...
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0answers
56 views

Conditionals and branching in shaders

This is a quite wide subject which implies a lot of topics such as the platform or the compiler, but I think that it could be useful for everyone to know more about this. A common mistake is to think ...
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0answers
48 views

What's a good research topic in Computer Graphics?

I am currently trying to find topics for my master's thesis. I would really like to do something in the field of computer graphics, but I've been having trouble finding what are some current problems ...
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1answer
46 views

UV partial derivatives of a cylinder shape primitive

I am new to rendering and I would like to calcualte UV partial derivatives of a cylinder shape, which is parameterized by radius $R$ and length $L$. Using cylindrical coordinate mapping, for a surface ...
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0answers
79 views

Why does my self-written rendering engine make further away objects look larger?

I am writing a very simple rendering engine. I have already made a few tests, but somehow the images it creates look wrong. Objects that are further away from the camera look larger than objects ...
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1answer
68 views

Rendering moist/wet materials like human anatomies for surgical simulators

Real human anatomies look wet/ moist when operated. I am looking for some good methods for rendering anatomies in a virtual simulation, and hence I have done a literature survey on 'Rendering wet ...
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1answer
124 views

How to display an in-memory framebuffer

I'm planning to write a small software rendering engine (before anyone asks, it's kind of a learning/scientific experiment for me). Before writing any code, I'm already stuck at the very first step: ...
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0answers
46 views

Accelerating dose calculation for a radiation therapy planning system

During radiation therapy, appropriate radiation is fired from various positions around the patient. Radiation therapy planning determines the values of the radiation at various positions. This ...
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1answer
41 views

How are digital painting canvas rendered?

Digital painting and raster graphics software like Krita and Photoshop have a canvas where you can paint with brushes. From a programming perspective, how is this canvas rendered? Can it be included ...
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1answer
80 views

Has anyone found an analytic solution to the product of spherical gaussians from Xu et al?

In section 4.2 of this paper: http://cseweb.ucsd.edu/~ravir/274/15/papers/a209-xu.pdf Xu et al approximate the product of 2 anisotropic Gaussian distributions. I want to know if someone has found not ...
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1answer
50 views

Converting Vertex and Index buffers to a File Format

I have many sets of vertex and index buffers that I’d like to render on to the screen. Ideally each model in different locations with-in world space. I’m actually doing a statistical study on spatial ...
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1answer
48 views

Finite difference wave equation shown in paper is wrong?

I'm trying to produce wave surface animations, and I came across this paper: Fast_Water_Animation_Using_the_Wave_Equation_with_Damping. In the paper they go to provide the following equation: At ...
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0answers
47 views

2D metaballs with marching squares and linear interpolation

I struggle do understand how linear interpolation works in the marching square rendering algorithm context. I created simple example in GDScript (Godot) of random floating metaballs to demonstrate ...
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1answer
66 views

Ray Tracing Bounding Volume Hierarchies nodes

I'm new to computer graphics programming so I apologize in advance if my question is stupid. I'm trying to implement a BVH for my ray tracer and I looked at some lectures explaining BVH. They all ...
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1answer
78 views

In Game Engines, how much of the graphics pipeline is already written?

I'm trying to understand how much graphics programming actually needs to be done if you are using an engine like Unreal Engine to build and package a game. I understand some of this might have to do ...
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1answer
79 views

Two questions on Gamma correction and Tonemapping

I have few questions regarding tone-mapping and gamma correction. is a tone-mapping operator a function whose output is a value between [0,1] ? If this isn't the case and since gamma encoding ...
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0answers
78 views

How to read illum value from mtl file using Assimp library?

I am loading an OBJ file using the ASSIMP library. Following is the MTL file associated with the obj file. ...
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1answer
102 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 ...
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1answer
45 views

Controlling “zoom” and “position” of a cubemap in shaders

I am trying to mimic reflections in image composition using shaders. I have gotten this far: In this image the floor is "reflecting" the back wall, however the reflection is uncanny because the ...
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0answers
92 views

How to achieve higher FPS for my GPU pathtracer?

So I've written a GPU based pathtracer using OpenCL-GL interoperability. The system uses the Mega-Kernel Approach instead of a wavefront one as I was aiming it as an educational software for other ...
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1answer
67 views

constant pixel width for any scale

I have a standard 3d camera/projection/model setup that renders rectangles with a WebGL shader. Users can zoom out and fly anywhere. I want to make sure that regardless of the scale, width of the ...
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1answer
86 views

BDPT - How to handle deterministic ray PDF?

I'm trying to implement a simple BDPT without MIS as described in Lafortune's paper. I've used the weighting scheme defined in the paper in which they suggest that the weight be based on the surface ...
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0answers
103 views

Procedural Generation of 4D Shapes

I'm curious if anyone has any insight into how one might procedurally generate 4D objects, as showcased in Miegakure (or the developer's other game, 4D Toys ). I built a program a while back to do ...
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1answer
82 views

Extracting information from EXR Files

I am relatively new to computer vision and image processing. I have a single EXR file with 7 channels: 1-3 give me the RGB values, 4-6 give me the surface normals coded as RGB values and 7th channel ...
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1answer
207 views

Which technique should be used for rendering under water images, Ray tracing or Radiosity?

Rendering is the process of computing a three-dimensional geometric description of a scene into a two-dimensional image representation that looks real. Ray-tracing and Radiosity are two of the most ...
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1answer
72 views

Intrepret path/light tracing by rewriting light transport equation

Given the rendering equation: $$ L_o(x, \theta_o) = L_e(x, \theta_o) + \int_{\Omega} \! f(x,\theta_i,\theta_o) L_i(x,\theta_i) \cos(\theta_i, \theta_o) \, \mathrm{d} \theta_i. $$ Rewriting it using ...
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0answers
97 views

BSP tree rendering

As a little project, I'd like to implement a BSP merging algorithm for Boolean operations on solids. But to even tell whether it works, I need some way to render the BSP tree. In other words, I have a ...
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1answer
205 views

Is there a way to perform calculations of Mandelbrot set using only integer numbers?

I would like to create program in JavaScript (JS) which draws Mandelbrot set with arbitrary precision (zoom). In JS there is build in integer type BigInt which support simple operations like +,*,/,...
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1answer
187 views

Rendering equation for spherical lights

I am currently implementing spherical lights in my DirectX game engine. I decided to build the shading formula from the classical rendering equation. Here is what I get: The simplifications show that ...
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4answers
441 views

Why isn't rasterization combined with raytracing more often?

If I'm not mistaken, you can make a hybrid renderer which lets a rasterizer solve the visibility problem, then shade all of the projected shapes with a raytracing algorithm. It seems that this isn't ...

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