Unity reserves some project folder names to indicate that the contents have a special purpose. Some of these folders have an effect on the order of script compilation. These folder names are:
See Special folder names for more information about these folders.
Unity compiles scriptsA piece of code that allows you to create your own Components, trigger game events, modify Component properties over time and respond to user input in any way you like. More info
See in Glossary in four separate phases, based on where the script file is located within the project folder structure. Unity creates a separate CSharp project file (.csproj) and a predefined assembly for each phase. (If there are no scripts eligible for a compilation phase, Unity does not create the corresponding project file or assembly.)
Compilation order is significant when a script references a class compiled in a different phase (and therefore located in a different assembly). The basic rule is that anything that is compiled in a phase after the current one cannot be referenced. Anything that is compiled in the current phase or an earlier phase is fully available.
The phases of compilation are as follows:
Phase | Assembly name | Script files |
---|---|---|
1 | Assembly-CSharp-firstpass | Runtime scripts in folders called Standard Assets, Pro Standard Assets and Plugins. |
2 | Assembly-CSharp-Editor-firstpass | Editor scripts in folders called Editor that are anywhere inside top-level folders called Standard Assets, Pro Standard Assets and Plugins. |
3 | Assembly-CSharp | All other scripts that are not inside a folder called Editor. |
4 | Assembly-CSharp-Editor | All remaining scripts (those that are inside a folder called Editor). |
Note: Standard Assets work only in the AssetsAny media or data that can be used in your game or project. An asset may come from a file created outside of Unity, such as a 3D Model, an audio file or an image. You can also create some asset types in Unity, such as an Animator Controller, an Audio Mixer or a Render Texture. More info
See in Glossary root folder.
You can organize the scripts in your project using your own assemblies by creating assembly definition files. Defining your own assemblies can reduce the amount of code that needs to be recompiled when you make an unrelated code change and can provide more control over dependencies to other assemblies. See Script Compilation - Assembly Definition Files for more information.
When you visit any website, it may store or retrieve information on your browser, mostly in the form of cookies. This information might be about you, your preferences or your device and is mostly used to make the site work as you expect it to. The information does not usually directly identify you, but it can give you a more personalized web experience. Because we respect your right to privacy, you can choose not to allow some types of cookies. Click on the different category headings to find out more and change our default settings. However, blocking some types of cookies may impact your experience of the site and the services we are able to offer.
More information
These cookies enable the website to provide enhanced functionality and personalisation. They may be set by us or by third party providers whose services we have added to our pages. If you do not allow these cookies then some or all of these services may not function properly.
These cookies allow us to count visits and traffic sources so we can measure and improve the performance of our site. They help us to know which pages are the most and least popular and see how visitors move around the site. All information these cookies collect is aggregated and therefore anonymous. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.
These cookies may be set through our site by our advertising partners. They may be used by those companies to build a profile of your interests and show you relevant adverts on other sites. They do not store directly personal information, but are based on uniquely identifying your browser and internet device. If you do not allow these cookies, you will experience less targeted advertising. Some 3rd party video providers do not allow video views without targeting cookies. If you are experiencing difficulty viewing a video, you will need to set your cookie preferences for targeting to yes if you wish to view videos from these providers. Unity does not control this.
These cookies are necessary for the website to function and cannot be switched off in our systems. They are usually only set in response to actions made by you which amount to a request for services, such as setting your privacy preferences, logging in or filling in forms. You can set your browser to block or alert you about these cookies, but some parts of the site will not then work. These cookies do not store any personally identifiable information.