Category Archives: Programming


Vuforia: Delayed Initialization Explained

Vuforial is a widely used AR toolkit, and if you use it for some time, you will find “Delayed Initialization” for sure.


You would like to try it, right?

Go and do it, cry please, you will see below errors:

Vuforia cannot be started before it is initialized.Please disable Delayed Initialization in the Vuforia configuration or initialize Vuforia manually with the VuforiaRuntime-class.


You would Google this, frustrated, as you can hardly find good answers, and here is why this article comes into play. Read the rest of this entry »

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Posted by on December 11, 2017 in Programming, Unity 3d, Vuforia (QCAR)


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React Native: “No dimensions set for key window” error and solution

In my recent project, I created a brand new React-native project, and run that on the simulator, then the captioned error pops up:

“No dimensions set for key window”

What hell does this mean? After a quick search on the internet, we found the solution: it turns out that the terminal (Mac) or the command line window is running for quite some time, and for unknown reasons, some of the information is outdated, which results in the captioned errors.

So the solution is simple:

  • Turn off all the terminal instances, restart the terminal/command line window,
  • Re-run the command:  react-native run-ios

That is it! Happy coding!

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Posted by on September 19, 2017 in Programming, React-native


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Learn React VR: A great tutorial series deserving a good read

Chapter 1 | Hello Virtual World
Chapter 2 | Panoramic Road Trip
Chapter 3 | Outdoor Movie Theater
Chapter 4 | Transitions and Animations
Chapter 5 | Star Wars Modeling
Chapter 6 | Vector Graphic Exploration
Chapter 7 | UI/UX Principles for VR Design
Chapter 8 | Building a VR Video App
Chapter 9 | Reacting to Our Exploration

Please support Michael Mangialardi either by up-voting his articles as shown above or purchase his git book.


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Posted by on July 27, 2017 in General, Programming, React-VR


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‘’ not found, the solution

Recently, I build some open source Android libraries, and when building the project, below error occurred:

Error:(2, 0) Plugin with id ‘’ not found.

Quick Solution:

install Yarn, everything works!

Mac: brew install yarn
Windows: refer to this link.


A less elegant solution is to manually change the top level build.gradle:


dependencies {
classpath ‘’

To –>

dependencies {
classpath ‘’
classpath com.github.dcendents:android-maven-gradle-plugin:1.5  //Add this
classpath com.jfrog.bintray.gradle:gradle-bintray-plugin:1.7.3      //Add this


Rebuild. It should work. But this is tedious, for every project (e.g. react-native), you repeat doing so?  Emmmmmm!

Now try to create a new react-native project using:

react-native init ProjectName

Run the project:

react-native run-android  // or
react-native run-ios

It compiles and works! Happy coding.


Posted by on April 18, 2017 in Android


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Using Firebase in Unity3D Tutorial 1: Basics and setup

Firebase is a platform that helps you quickly develop high-quality apps,  It is made up of a collection of features that is very handy for Unity3D, Android, iOS app developers.

In this series of tutorials, I am going to cover how to harness Firebase features to streamline your app development process. Each tutorial is designed to be compact, and follows the SRP (Single Responsibility Principle), so that you can use these take-aways quickly in your own development.

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Posted by on January 21, 2017 in Programming, Unity 3d


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Firebase Unity3D example: a walk through tutorial


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Posted by on January 16, 2017 in Programming, Unity 3d


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