Unity 3D Assembly Definitions

✍ Last Updated : November 4, 2022

🚪 Prequisite Knowledge (Optional)

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❓ Key Question / Problem / Issue

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1. Why we need Assembly Definition
2. What Issue Assembly Definition trying to solve
3. Any known Problem in Assembly Definition Implementation

✅ Expected Output/Definition of Done

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1. Guideline on what Assembly Definition is?
2. Guideline on How to start using Assembly Definition
3. List of Trick on How to properly Implement Assembly Definitions

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Assembly definitions

An assembly is a C# code library that contains the compiled classes and structs that are defined by your scripts and which also define references to other assemblies

How to:

1. Right Click on the Package → Create → Assembly Definition

Frequently Asked Question

1. I’ve heard it slows compilation speed instead

   no it doesn’t. from the forum above what cause editor slowing down is caused by unity domain reloading.

   you can check how assemblies are built and how long it takes. with the following gist

   Find out what assemblies are being built and how long each takes.

   additionally here are some trick found to reduce editor slowing down by disabling domain reloading. but watch out for other caveats within it

   Domain Reloading

   there also has been lots of update since the post that improve assembly definition performance

   Unity 2020.2.0 - Unity

   Unity 2021.1.0 - Unity