I am just starting building up an interesting isometric game. As an Unity3D beginner, I want to collbrate some important components information while I am learning. This blog listed most frequent used elements in Unity3D camera.

Objection:

• perspective: Camera will render objects with perspective intact. It will look into both visible and invisible objects in 3D.

• orthographic: Camera will render objects uniformly, with no sense of perspective. It will look into only visible objects. The camera itself is like a plane. If you want to build 2.5D game, or isometric game, you can set camera orthographic.

When you build up an Android library, but not sure if it works properly. When a company has multiple modules and want to allow their employees access and use module easily. Aritifactory is one tool that is useful for speeding up development cycles. You can publish your modules or libraries into Artifactory repositories, and only let people in localhost to use them.

How to install and setup Artifactory?

I am using Linux environment to build up Artifactory. Therefore, I will only talk how to install it in Linux system. If you don’t have Linux system, you can use virtual machine (Virtual Box) or host a Linux system in clouding system (AWS).

After I built up release version of APKs/AARs files and push SDK to Artifactory for exposing Android libraries for developing and testing (I will write an article explaining what is Artifactory), I find out it is still hard to testing. I don’t know what is wrong with my SDKs after I imported to a new App since there is no log for realease version and I cannot use debug mode.

I finally find out one solution. I still feel like it is not the best. However, right now, I have no better solution. If you can solve this problem, please leave your comment and method here, it will help me out a lot.

How to apply Proguard/Dexguard

Proguard/Dexguard shrink and obsfucate resources and codes by scanning and looping up the dependencies. It will do everything it thinks necessary. To apply proguard, simple change minifyEnabled in the module/app you want to apply to be true. Android will apply for Proguard automatically.

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buildTypes {
    release {
        minifyEnabled true
    }
}

Remember in article synch/Asynch Callback in Java I wrote, multithreading in Java is important and can improve performance. We can use callbacks to notify some threads finish executing. What if we don’t need to pass arguments, but we still want to implements multithreads falixable? Another simple way to let a thread wait and wake up is to use Object.wait() and Object.notify().

Keep in mind that:

• Object.wait() means suspend a thread.
• Object.notify() means wake a thread up.

Callback Function

Image a senario, you have several threads executed at the same time, how can you know some threads are already finished? Maybe you want to execuate a thread after another thread, then how can you control the flow? Here, we can use callback functions.

A callback function is a function passed into another function as an argument. The purpose of it is to inform a class Sync/Async if some work in other class is down.

In java, we can implement calbaks by interface. Here is the steps: