Creating bullet patterns
Bullet patterns are described in DanmakuJSON-files (with the extension .dmjson) which can be edited in any text editor.
You can create a new bullet pattern by selecting the option "Assets -> Create -> Danmaku Engine -> DanmakuJSON File" from the main-menu or "Create -> Danmaku Engine -> DanmakuJSON File" from the context-menu in the project hierarchy (right-click in the "Project"-window).
You can also put .dmjson-files anywhere in the /Assets-folder of your Unity project - these will be imported automatically.
To avoid performance penalties during runtime, all .dmjson-files are automatically compiled to a binary format which is stored in additional .asset-files. Note, that only these compiled files can be attached to your DanmakuOrigins.
In case you deleted one or more compiled DanmakuJSON-files choose the menu option "Edit -> Danmaku Engine -> Compile All Bullet Patterns..." to re-compile all .dmjson-files in your project.
The DanmakuJSON Editor
For quick live-editing and debugging purposes you can edit your bullet patterns with the DanmakuJSON Editor (also while your game is running). Choose "Window -> DanmakuJSON Editor" to open it.
Note, that this editor has a very limited feature set - use a text editor you are most comfortable with if you want to make bigger changes to your bullet patterns.