When the tracking areas get very small, it’s easy for errors to be introduced and parts of the mesh to deviate away from where they should be. With a non-planar surface, especially when the surface is deforming, each tiny area of the mesh needs to have its own motion calculation. “This allows us to use all the pixel information in the entire area to calculate one consistent result, which can be extremely stable. So how does PowerMesh work, and what were the technical challenges in implementing a tool that could track warped surfaces? Shain says it goes back to how artists were already using Mocha’s planar tracker, including with the rigid planar constraint. With PowerMesh the same process is not only much faster but now artists can work on warp stabilized image for difficult paint and clean up shots.” “VFX artists already used Mocha Pro for face tracking and stabilization, for example, Pixel Magic famously did a lot of head replacements on the film Green Book. The test needs to start the server: var boot = require('./app').“Optical flow solutions can be slow and difficult to work with, so we took a different approach,” outlines Ross Shain, chief product officer at Boris FX, in relation to the development of PowerMesh.

Now, create a test folder with $ mkdir tests and open tests/index.js in your editor.

supertest: a superagent-based assertions library.

core http module: clunky and very low level.

request( ): the third most-starred NPM module (as of this writing).

Alternatives to superagent include the following: The latter is a library to streamline the making of HTTP requests.

Modify this command by replacing package name and version number for expect.js v0.2.0 and superagent v0.15.7 ( ).

The -save-dev flag will categorize this module as a development dependency (devDependencies).

Then, install Mocha in the Blog project folder, and add it to the package.json file at the same time with $ npm install -save-dev. The source code for this tutorial is in the ch3/blog-express folder of the practicalnode GitHub repository ( ).įirst, let’s copy the Hello World project. We won’t get into headless browsers and UI testing, but we can send a few HTTP requests and parse their responses from the app’s REST end points. The goal of this mini-project is to add a few tests for Blog.

Mocha pro 2020 tutorial