This book on rendering considers REAL rendering systems,integrating complex geometry, procedural shading, and globalillumination. It is edited by Ian Stephenson, but each chapter has beenwritten by a software developer currently working on commercia

光流判断移速小程序，ratio输入实际速度除以ratio=1时的lightflow的值（其实就是没做标定简单地将实际速度与像素值做比例）。index是相机编号，设置完数值再开启，或先按stop再设置。

Lightflow - 一个微型类似于Promise的控制流库，支持浏览器和Node.js。