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This is a paid asset, but now you can download ActionSequencer Free.
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ActionSequencer v1.0
This package provides scripts and prefabs to allow designers to create simple NavMesh AI within a custom editor. The primary scripts are the Sequencer that follows a list of commands, such as ‘go to target’ or ‘play script’, and the Trigger script that fires off a given event for given conditions. There are additional tools that work with these two scripts such as way points and trigger volumes to help design AI behavior. This package also has some scripts to help start out creating a game. These are basic inventory, equipment, character movement, and dialogue importing.