VariaBULLET2D has a built-in collision system that uses Unity’s underlying collision setup. Since these settings are user defined and at the project level, there is a small amount of configuration required to ensure the required tags, layers and collision settings are set up properly.
Since care has to be taken when integrating VariaBULLET2D with existing projects, it is highly recommended that you first import VariaBULLET2D into a fresh new project. This will also make it much easier to setup the collision system and run the included demo scenes.
For setting up the system in a fresh project, refer to the Automatic Setup instructions below, while Manual Setup is for incorporating in existing projects.