Unity .gitignore template

Library is the asset import cache and the single largest directory in a project. Every texture, model and audio file gets converted into an internal representation the first time it is imported, and that conversion is deterministic from the source asset plus its meta file. It runs to gigabytes on a real project and it is rebuilt on first open, which is slow but correct.

The meta files are the counterpart nobody should ignore. Each asset has a sibling .meta file holding the stable identifier that scenes and prefabs use to reference it. Losing a meta file breaks every reference to that asset, so those files must be committed even though they look like generated noise. Nothing in this template ignores them, and that omission is deliberate.

Temp, Obj, Build and Builds cover the compilation and player build output. UserSettings holds per developer editor preferences, MemoryCaptures holds profiler snapshots and Recordings holds captured playback. All are written with bracket character classes because the editor's casing has varied across versions and git is case sensitive where Windows is not.

The project file rules cover *.csproj, *.unityproj and *.sln. These are regenerated by the editor whenever the asset database changes, which means a committed copy conflicts constantly and is overwritten locally anyway. Ignoring them is right, and it is also why opening a fresh clone in an IDE requires letting the editor generate them first.

The remaining rules cover debugging and crash reporting artefacts: *.pdb, *.mdb, *.opendb, *.VC.db and their meta variants, plus sysinfo.txt and crashlytics-build.properties. The last of those can hold identifiers tied to a crash reporting account, which is another reason to keep it out.