禅心剑气相思骨

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, pdfProbability density function describes the random distribution

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

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 on the master branch. In jsconf2018, Ryan Dahl gave a talk, Design Mistakes in Node, and brought his next generation server-side TypeScript runtime, deno, to the public. At this moment, deno is still a very early stage

Programming

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

Note: this article compiled and tested on CentOS 7, based on commit 246 on the master branch. In jsconf2018, Ryan Dahl gave a talk, Design Mistakes in Node, and brought his next generation server-side TypeScript runtime, deno, to the public. At this moment, deno is still a very early stage