Game Dev Essentials: State Machines in Unity

Import the 2D sprite package and golden chest animations from the pixel art platformer, organize assets in a third party folder, and prep the chest textures in the sprite editor.

Drive unity animations by crossfading between idle, walk forward, and walk back based on w input, while illustrating how a clunky spaghetti approach motivates a state machine.

Add an eat animation to the bear by pressing E, crossfading via the animator, and expose the messy, hard-to-scale state logic that motivates exploring state machines for cleaner design.

Learn to build a 2d character driven by a state machine, create an assets-based Unity URP scene, import sprites, slice frames, and craft an idle animation with the character animator.

Slice a walk sprite sheet into eight frames, create walk and idle animations in the animator, and wire input to switch between them while laying groundwork for a state machine.

Implement a serializable state machine in Unity, add states by mapping names to implementations, and expose a public owner property so states can trigger transitions.

Create a utility to generate boilerplate state scripts for Unity state machines, reducing repetitive code by using a template and a custom create state script utility.

Implement a bear state machine in Unity, adding idle, walk forward, walk back, and eat states, wiring transitions, and animator crossfades to drive animations via input.

Import the jump sprite, slice the image, create a jump animation from two sprites, and apply it in the animator to implement the jump state.

Add a jump state to the Unity character state machine, reading the jump action, playing the jump animation, and applying vertical velocity with transitions from idle and walk when pressed.

Implement a crouch state by dynamically resizing and offsetting the capsule collider 2d during crouch, then restoring it when standing, and connect these changes to movement and velocity.

Import run sprites, set 16 pixels per unit, slice into eight frames, create a run animation, and attach it to the player animator beside the walk, removing the run animator.

Create a push hands object as a child of the player with a hands collider to push boxes using Unity physics, tuning a 2D box collider's size and offset.

Create a pushable box in a 2D Unity scene by implementing the IPushable interface on a MonoBehaviour, using Rigidbody2D and BoxCollider2D, with mass toggling between 50 and 2 during push.

Learn to implement a push state in Unity using a hand collider, enable/disable logic, and precise transitions between idle and push, including push speed and animation control.

Create an I pullable interface and a pullable point as monobehaviours, using a fixed joint 2D to connect the player's rigidbody when pulling, and adjust mass for push/pull states.

Learn to implement a pull sensor in Unity by using a box collider trigger, sensor layer management, and trigger enter/exit logic to detect pullable objects and broadcast changes.

Connect the pull sensor to the character by wiring a serialized sensor reference, then listen for pull events and update the character sensor data with the pullable.

Implement ladder climbing in Unity by entering a climb state with the W key and stepping up or down via four animation events, wiring public methods to those events.

Fix ladder collisions by ignoring the default layer and using the obstacle layer, add a sorting group, and implement a ladder script with bottom and top points and gizmos.

Learn to bind and sync Unity animations with scripts using animation events, create a character animation events script with public methods and events, and wire end-of-animation listeners for sequencing.

Master state machines in games by exploring jump, walk, and run behaviors, sensors, and artificial intelligence in Unity, using rigidbodies, colliders, and scalable design.