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Changes in Unity 2018 LTS: What You Need to Know

When upgrading your project from Unity 2017 LTS to Unity 2018 LTS, it is essential to be aware of the changes that may affect your existing projects. In this article, we will explore the key modifications introduced in Unity 2018 LTS, ensuring a smoother transition for developers.

Package Manager Changes

One significant change in Unity 2018 LTS is the renaming of the `UnityPackageManager` directory to `Packages`. This modification aims to eliminate the risk of conflicts with other package managers like Nuget or external package managers. To avoid potential issues, it is crucial to update your project's configuration to use a different directory for packages.

VCS Configuration Update

If your project uses a Version Control System (VCS) such as Perforce or Git, you may need to update its configuration to track the `Packages` directory instead of the `UnityPackageManager` directory. This change will ensure that your VCS correctly tracks changes made to your packages.

Manifest.json File Movement

The `manifest.json` file should automatically be moved to the new `Packages` directory during the upgrade process. However, if you encounter any issues with manifest file movement, please refer to Unity's official documentation for guidance.

Other Important Changes

Several other notable changes have been introduced in Unity 2018 LTS:

* Compiling unsafe C# code in the Unity Editor now requires enabling a specific option.

* GPU Instancing supports Global Illumination.

* Particle System Mesh particles applied the Pivot Offset value incorrectly.

* Assets located in plugin folders will no longer be imported via specialized importers.

* BuildPipeline callback interfaces now take a `BuildReport` object.

* MonoDevelop 5.9.6 has been removed from Unity Installers and support for it has been deprecated.

* TouchScreenKeyboard.wasCanceled and TouchScreenKeyboard.done have been made obsolete.

* AvatarBuilder.BuildHumanAvatar is being deprecated.

* Player Quit notifications have changed from messages to Events.

* BuildPipeline APIs now return a `BuildReport` object instead of a string.

* Coroutines returned from a MonoBehaviour while its GameObject is being disabled or destroyed are no longer started.

Deprecations and Removals

Some features have been deprecated or removed in Unity 2018 LTS:

* The UnityScript and Boo scripts compiler has been removed.

* The legacy networking APIs (RakNet based) have been removed.

* Animator Root Motion playback has changed.

* Photoshop Data file (PSD) import using transparency is no longer supported.

Tips for a Smooth Upgrade

To ensure a successful upgrade, follow these tips:

1. Update your project's configuration to use the new `Packages` directory.

2. Verify that your VCS is correctly tracking changes made to your packages.

3. Review the changes mentioned above and adjust your code accordingly.

In conclusion, Unity 2018 LTS introduces several significant changes that may affect existing projects when upgrading from Unity 2017 LTS. By understanding these modifications, you can ensure a smooth transition for your projects and take advantage of the new features and improvements offered by Unity 2018 LTS.

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