禅心剑气相思骨

Programming

How to renew your code-Sign certificate if you lost your private key

Code-Sign is critical to delivering software to the public. The modern operating system will prevent launching an unknown software. Only the one with a proper code-sign certificate is allowed to start. For Windows 10, a famous popup shows up when the user is trying to launch the software from an

Thoughts

动物庄园，自由和平等的谎言引发的独裁

一部小说描述的是故事情节，一则寓言揭示的是事物的本质。《动物庄园》出版于1994年，值二战胜利前夕。作者乔治.奥威尔在书中描写了一只猪引发的革命，随着时间推移，革命开始退化为独裁统治，并最终失败。

Programming

树莓派，iPad最佳DevOps配件

虽然Macbook现在已经非常轻便了，然而iPad显然比Macbook更加优雅。我的大部分工作现在都能在iPad上完成了，然而还有很大一部分代码相关的工作不能在iPad上完成。尤其是有些时候需要测试简单的代码，iPad基本不能为力。

Programming

Asynchronous function in Unity

Since Unity 2019, Unity introduces C# task and async/await keyword to MonoBehaviour...

Computer Graphics

渲染方程中的路径积分

路径追踪是第一个光线传输算法，并广泛应用于Realistic Rendering中。路径追踪将渲染方程的积分式转换成一个路径积分的形式，并且通过蒙特卡洛积分方法对每一项进行积分，从而得到一个统计上无偏的渲染结果。

Mathematics

Random Distribution

Random variable $X$ is a function, it maps a set of random events to a set of numerical values. The random variable can either be discrete or continuous. A continuous random variable uses probability density function $p(x)$ to describe. Probability density function, pdf Probability density function describes the random

Computer Graphics

Rendering Equation

Artificial Intelligence

Gradient descent

Recently, I was studying neural networks and deep learning on Coursera. I realised it is crucial to understand gradient descent and backward propagation...

Computer Graphics

Function Plotting in GLSL

Function plotting is a useful tool to visualize mathematical functions. There are many tools available online. Most of them are written in...

Programming

Cloud Computing

A brief introduction to cloud infrastructure.

Programming

Screen Space Reflection in Forward-Rendering Pipeline

Screen Space Reflection is one of the most commonly used techniques to improve image quality in real-time rendering...

Computer Graphics

Scratch A Pixel - Reflection

Implementation of Screen Space Reflection.

Programming

Concurrency vs Parallelism

A brief introduction about Task parallel model.

Programming

Top two interview questions of async programming

One of the most important things about building an application on top of the game engine is performance. We have to carefully...

Mathematics

向量空间，赋范空间和内积空间

在公理化定义向量空间之前，我们先来公理化定义数域。我们接触过的数域有，实数域R，复数域C。在一个数域上，我们可以对数进行加减乘除运算，其运算结果仍然在该数域当中。其严格表述可表达为...

Mathematics

函数插值与插值多项式

函数插值在物理学，天文学中有广泛的应用。函数差值帮助我们从一群实验散点中预测未来的数值趋势和走向。我们在这里主要讨论两个最简单的多项式插值方法，即拉格朗日插值和牛顿插值。

Mathematics

Precision errors and quadratic equation

Solving quadratic equation is a quite common question in mathematics. But because of the floating-point precision issue, for same special coefficients, it will produce numerical errors.

Programming

Manjaro —— 替代Windows和MacOS作为主要工作环境

一直以来，我的主要工作平台都是Macbook Pro和CentOS。用Macbook主要是省心，不需要去特殊关照命令行，环境和API基本和Linux一致，部署生产环境的时候基本不会遇到什么问题。

Programming

Port Lua to Web Environment using WebAssembly

Recently, all major browsers like Google Chrome, Safari, Microsoft Edge all support web assembly. Web assembly allows...

Programming

Asynchronous and Event-driven Programming in Lua

Asynchronous and event-driven are the key concepts in nodejs. It wraps I/O operation into an asynchronous event and uses callback function as the event handler. libuv is the low-level C API that provides the event driven mechanism to nodejs environment. libuv provides a set of generic API for different

Programming

Interfacing Lua with C

Lua is a lightweight, multi-paradigm programming language designed primarily for embedded use in applications.

Computer Graphics

Checkerboard Rendering

Checkerboard rendering, also known as checkerboarding for short, is a 3D computer graphics rendering technique...

Thoughts

The Last of Us

上个星期的时候，玩完了The Last of Us，还有DLC – Left Behind。玩完的时候，有一种怅然若失的感觉，一直想写一篇文章来结束这20小时的故事，但总觉得不知道感情的着落点在何处，甚至沉思了许久，写了又删，结果便是连开头都没有挤出一点。

Programming

Recreate Deno from Scratch (#re-deno) #2: Basic concept of V8 JavaScript Engine

Note: this article compiled and tested on CentOS 7, based on commit 246 [https://github.com/ry/deno/tree/a2064ca89c21500b4e0c9c5a42a862c58b7c813b] on the master branch. > In jsconf2018, Ryan Dahl [https://github.com/ry] gave a talk, Design Mistakes in Node [http://tinyclouds.org/jsconf2018.pdf], and brought his next generation server-side

Programming

Recreate Deno from Scratch (#re-deno) #1

Note: this article compiled and tested on CentOS 7, based on commit 246 [https://github.com/ry/deno/tree/a2064ca89c21500b4e0c9c5a42a862c58b7c813b] on the master branch. > In jsconf2018, Ryan Dahl [https://github.com/ry] gave a talk, Design Mistakes in Node [http://tinyclouds.org/jsconf2018.pdf], and brought his next generation server-side