Questions tagged [computer-graphics]

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How is slope error calculated for Bresenham’s Algorithm for both 2D and 3D?

I've been working with Bresenham’s Algorithm in 2D and understand it is derived from the following logic: y = mx+c To get the slope error at a given point, the following equation is used: d2 is the ...
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Recursive Catmull–Rom Spline Algorithm - Why special treatment in the final step?

I've been reading this Wikipedia article on centripetal Catmull–Rom splines, and there, the discussion is presented in terms of the recursive definition by Barry and Goldman (1988) (DOI ref). The ...
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What's the mathematics behind the technique of "keeping a square a square" in chapter 2 of "OpenGL superbible" 4th Edition?

In "OpenGL superbible" 4th Edition by RICHARD S.WRIGHT JR page 60, there's this piece of code that confuses me: ...
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2D Shearing as a composition of other 2D transformations

I am trying to find out how to derive the shearing matrix (either in x- or y-direction) as a composition of other elementary 2D transforms, such as rotation and scaling. There are some answers ...
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1 answer
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Video compression algorithm

I am working on a project for my CS subject and the topic is Video compression. After theoretical aspect, I want to implement and describe one algorithm that does video compression. I am not sure if ...
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Why are point clouds useful for large datasets of geometries?

In my computer graphics course I came across this "pro" for point clouds: Useful for large datasets (>> 1 point / pixel) I'm trying to wrap my head about it, I know drawing is ...
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can similarity transformation be linear transformation?

Learning Computer Graphics - Can similarity transformation be linear transformation? Similarity T is a rigid transformation (translation and rotations) with uniform scaling. so I guess a similarity ...
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What is the historical origin of the concept of a "clipping path"

Algorithms for clipping lines to a rectangle seem to have been invented by Ivan Sutherland in the late 60s. At some point the rectangle was generalized to an arbitrary polygonal area, and these days ...
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Ray tracing tree

Let's suppose that we have a light source. Which of the following are correct for the tree of recursive ray-tracing (ray tree) that create when we make the colors for each pixel in the screen. Which ...
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1 answer
524 views

Determining the intersections of a line segment and grid

Problem: Given a line segment on the cartesian plane, determine where and which order it intersects a regular grid. This sounds simple, but is actually quite a tough problem. It's related to, but ...
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How to extract the buildings bottom surfaces from a large city 3D mesh?

I have a 3D mesh comprised of city buildings, no ground surface, just buildings. The goal is to extract the buildings bottom surfaces. So far I have tried to cut the mesh by a threshold computed from ...
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What is the difference between DeepFake and First Order Motion?

What is the difference between DeepFake and First Order Motion? Is it the same or not?
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Bresenham's line drawing algorithm guarantees

I am considering implementing my own version of Bresenham's line drawing algorithm, found here, my one question is does the algorithm guarantee that both endpoints will be covered/drawn. I am doubting ...
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2 answers
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How is CPU different from GPU?

A central processing unit offers to handle various operations like calculating, watching movies, making presentation etc. While a graphics processing unit is majorly used for the purpose of video ...
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Jaccard decay, Jaccard recall, and class-agnostic binary segmentation

When reading about SiamMask (Wang et al., Fast Online Object Tracking and Segmentation: A Unifying Approach), I encountered the terms "Jaccard decay" and "Jaccard recall". I know what Jaccard index ...
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