Summer of Math Exposition
Presented by
3blue1brown
Archive
Rank 127
Billboarding in 3D Graphics: From Classic Games to Neural Rendering
Billboarding in 3D graphics is a technique that has evolved significantly from its early use in video games to modern applications. Originally used in games like Super Mario 64 to conserve computational resources, billboarding involves displaying a 2D image that always faces the camera, creating the illusion of a 3D object. This technique has two main types: viewpoint-oriented, which directly faces the camera, and screen-aligned, which remains parallel to the camera’s viewing plane. The mathematics behind billboarding involves calculating vectors, cross products, and rotation matrices to ensure the billboard maintains its orientation relative to the camera. As scenes grew more complex, performance optimization techniques like culling and occlusion culling were developed to render only visible billboards, reducing computational load. Despite its effectiveness, traditional billboarding can struggle with complex scenes or objects viewed from multiple angles. Modern approaches, such as Neural Radiance Fields (NeRFs) and implicit neural representations, address these limitations by using neural networks to reconstruct 3D scenes from multiple images, allowing for more realistic renderings and interpolation between captured images. This evolution from simple 2D sprites to advanced neural network techniques highlights the significant progress in graphics rendering and the ongoing innovation in creating immersive 3D environments.
Rank 128
An open problem in graph theory
The problem specifically forms a bridge between quantum mechanics and graph theory. This video talks about how a problem inspired from quantum mechanics can be dealt as a graph coloring problem and interestingly, it's open.
Rank 129
Divisibility Tricks
Reviews divisibility rules for 2-11 and goes over the derivation
Rank 130
Cooking a Steak In an Optimized Way
This video explains a heat-equation-based model for steak cooking optimization and uses an experiment to test its effectiveness. The model is based on Prof. Jean-Luc Thiffeault’s article “The Mathematics of Burger Flipping”: https://arxiv.org/abs/2206.13900
Timeline of the video:
00:00 General Introduction
01:49 Modeling the Steak
03:16 Deriving the Heat Equation
07:43 Boundary Condition
11:06 Nondimensionalization
13:05 Homogenize the Equation
15:31 Solving the Heat Equation
19:54 Modeling the Flip
25:51 Experiment Setup
25:35 Experiment of Optimized Steak Cooking
26:45 Result and Error Analysis
28:04 Conclusion
Rank 131
Isomophism explained with sets
i couldnt rly understand isomorphism of objects before i visualized it with sets. here's a how
Rank 132
What is a number?
I explore and the idea of what numbers are and try and create a definition that includes numbers but excludes non numbers.
Rank 133
Quaternion Mandelbrot Set
This video explores how to graph the Mandelbrot set, first by finding it's real portion, then complex, then even hypercomplex (partially). Some very interesting shapes are created.
Rank 133
Complex Dual Numbers Construction
The Complex Numbers are pretty well known, but their infinitesimal cousin, the Dual Numbers, is much less popular. However, I thought it would be interesting to combine the two into a single structure, but soon found there are multiple ways to achieve this depending on the exact properties you would want. With the first definition, the i and epsilon components do not commute, but in the second definition they do. You decide which is more exciting to you!
Rank 134
Ultrashort laser pulses vs. monochromatic waves
In this video it is explained how the ultrashort laser pulses can be viewed as superposition of monochromatic (infinite) waves.
The video was inspired by the Nobel Lecture in Physics by Donna Strickland (particularly minute 24 in the linked video): https://youtu.be/sI_e7c085LM?si=2xKL4s3DDpIBHG1H
Rank 135
Factoring is Polynomial
Details about a new algorithm to factor numbers in polynomial time.
Rank 136
How to beat the Graham's Number
An introduction to the fast growing hierarchy.
Rank 137
Viewing the probability of a singular outcome with positive density as greater than zero and why it matters
My take on the probability of singular outcomes with positive density. I am aware there are several errors in what I said and wrote. The part at 11:53, I meant that f(x) to be x squared, so that integrating k times x squared from 1 to 4 and setting it equal to one would give us a pdf. At 12:58, when I said the denominator is 1, I meant for the k times x squared function, for the appropriate value of k. Also, when I'm talking about the probability of x being between 2 and 3 on the continuum, the f(x) dotted lines in that range were supposed to look red. It seems like increasing the brightness of the video made the dotted lines appear black, which was not my intent. This is my entry for the Summer of Math Exposition 4, but unfortunately I ran short on time.
Although I feel that this can be understood without first year college courses in Calculus and Probability, having a background in said courses will make the video even easier to understand.
Rank 138
Abstraction, or why your model of the world is wrong (and that's probably fine)
a presentation on the agent model, why an agent uses and improves upon it's model of the world and why models in general though being inaccurate still prove useful
also my first time filming and editing a video
Rank 139
An Engineer’s Take on Bertrand’s Paradox
I'm focused on practical solutions to Bertrand’s Paradox. I demonstrate how you should translate a problem from something ambiguous, like English, into something precise, like geometry.
I assume the viewer has at least seen Bertrand’s Paradox before. My engineering advice applies to anyone who deals with "word problems."
Rank 140
Generalization of the Gamma Function
By setting a=-1 and n: (n-1) you get the gamma function in the family of functions the final equation generates.
Rank 141
How to load weight plates optimally (in polynomial time)
In the very young sport of streetlifting, athletes are in direct contact with the weight plates, as opposed to the sport of powerlifting or Olympic weightlifting. That's why it is important to select the weight plates and arrange them in a certain manner. My aim is to explore what makes an arrangement of plates good or bad and to create an alternative to the greedy algorithm of powerlifting.