What is a GOAP Agent?

• Goals: The state that the agents want to happen.
  • A state is simply a true or false situation
• Actions: The things the agent can do, each has a set of preconditions, effects and cost
  • A precondition is what determines if an action can be started or not — For example, To Eat you need a precondition of HasFood.
  • An effect is the result of action and that result can trigger a precondition to be true. — For example, The Find Food action sets the HasFood state to be true.
  • A cost is used by the planner to decide between which plan to take. A dynamic cost can help your agents achieve fuzziness logic.
• Planner: Plans a sequence of actions based on the current states to satisfy a goal.
• Agent States and World States, these states are persistent effects.

Designing the Agent

When creating an agent, you need to first have a design. So let's choose a design. For simplicity sake, in this tutorial, we will assume the Agent already has a target and will omit it from the preconditions.

Agent: Soldier 
Goals: 
	- `HurtTarget`
Actions:
	- Shoot
		- Preconditions: `InShootingRange`
		- Effects: `HurtPlayer` 
	- GoTo
		- Preconditions: `Not InShootingRange`
		- Effects: `InShootingRange`

Preview of What will be making

We will make a simple agent that follows a target and shoot it when it is within range.

In a new scene, add a new GameObject, name it Agent Soldier and add a cube as a child.

Add a BasicAgent component and then add a HurtTarget goal.

Under the AgentSoldier GameObject

1. Create an empty GameObject and call it Actions