Unreal Engine 4 Class: Blueprints

Organize blueprint graphs in Unreal Engine 4 by using the reroute node to simplify connections, drag and position lines, add comments via the three-dots menu, and keep code unchanged.

Explore node types in Unreal Engine 4 class: blueprints, variable nodes (integer, boolean), events (begin play, tick), and functions (print string, get actor location), macros. Construction script cannot be deleted.

Explore how public and private variables work in Unreal Engine 4 blueprints by using an actor, testing access in the level blueprint, and noting access rules for child blueprints.

Learn how to create and enable editable variables in Unreal Engine 4 blueprints, using the eye icon to expose booleans, rotators, and other types in the details panel and world.

Enable Expose On Spawn for a blueprint variable and mark it editable. See how Level Blueprint uses Spawn Actor of Class with BP_PublicPrivate to demonstrate Expose On Spawn.

Learn to create arrays in Unreal Engine blueprints, including boolean, integer, and string arrays with 0-based indexing, adding, deleting, and accessing elements.

Use the length function to count items in an array and output the result as an integer, illustrated with a string array of four items.

Learn how the contains item node checks if a specific value exists in a string array in Unreal Engine blueprints, returning true or false and printing the result.

Explore the Clear node in Unreal Engine 4 Blueprints, which empties an array by removing all elements. After Clear, the array length becomes zero, shown by a print string.

Learn to work with arrays in Unreal Engine blueprints, including checking valid indices and appending two arrays to merge their items, with emphasis on execution order.

Group three spheres into an array in Unreal Engine blueprints and access items to move the active sphere with keys 1 and 2, switch spheres with B, N, and M.

Demonstrate creating and populating an actors array in the level blueprint, then switch between Sphere1, Sphere2, and Sphere3 using B, N, M keys and update their locations.

Explore flow control with the branch node in Unreal Engine 4 Blueprints, evaluate boolean conditions, and route execution through true or false paths using Begin Play and Print String.

Use the sequence flow control node to trigger multiple actions in order with no delay during begin play. Connect sequence outputs to prints like sequence1, sequence2, and sequence3.

Master for loop flow control in Unreal Engine blueprints by using first and last indexes to repeat the loop body a finite number of times.

Use the flip flop node in flow control to alternate between two actions on successive events. It switches between A and B with each trigger.

Master flow control with the Unreal Engine 4 multi gate in blueprints, triggering a sequence of events through multiple outs in order, with looping, random order, start index, and reset.

Learn how Unreal blueprints use events, functions, and macros to reuse code and trigger logic. Events accept time actions; functions and macros accept inputs/outputs and have their own graphs.

Explore how events in Unreal Engine Blueprints trigger actions at times such as BeginPlay, ActorBeginOverlap, Tick, and keyboard input, and learn how to connect branches and variables.

Modify blueprints by using macros to control execution with multiple inputs and outputs. Learn to add parameters, set execution order, and branch paths to customize macro behavior.

Apply events, functions, and macros in unreal engine 4 blueprints by building a simple order workflow that calculates change from the paid amount and the order price using a macro.

Design and connect custom events, functions, and a macro in Unreal Engine 4 blueprints to order pizza, calculate price and change, and display results with print strings.

Explore how enums organize data as named lists of values, accessed globally in Unreal Engine blueprints, and learn to create and use enum types like timeline directions and mouse clicks.

Explore how to work with enums in Unreal Engine 4 blueprints, using get and set to manage enum values, print them, and prevent cross-enum type conversion.

Learn how to compare enum values in Unreal Engine 4 blueprints using equal and not equal checks, branch logic, and print statements, with examples like character skills and states.

Explore using switch on enum in Unreal Engine 4 blueprints to drive state-based logic for Fireball, Icewall, Windblow, and Heal, with content browser lists and reusable enums.

Explore the fundamental Unreal Engine 4 blueprint structure: the game, gamemode, controller, pawn, and character, with per-player HUD and input, including AI control and multiplayer setups.

Discover how components form subobjects inside actors and other classes, including the default scene root and static mesh components, and how world versus relative transforms drive placement and hierarchy.

Learn how game mode stores global rules and player state, override the default with a custom BP_GameMode, and set it in world settings to control pawns, HUD, and controllers.

Explore the Unreal Engine 4 character class, pawn-based blueprint with walking, running, jumping, flying, and swimming. Learn how SkeletalMesh, Capsule Component, and Character Movement enable animation, input, and third-person control.

Manage a pawn with a controller class that supports player or AI variants and receives events. Create BP_Controller and set it as the default player controller in world settings.

Learn to create an actor blueprint with a static mesh component, import FBX assets, assign multiple materials, and manage root vs component transforms in Unreal Engine 4.

Spawn and destroy actors in a level blueprint using spawn actor from class, assign transform location rotation and scale, and destroy the spawned actor via its returned reference.

Learn to use isValid in Unreal Engine 4 blueprints to safely access an actor's world transform before destruction, preventing errors and crashes.

Use get all actors of class in blueprints to collect all BP_Actor instances, pick the first actor by index, and set its door location to 0,0,0 to observe the change.

Compare skeletal mesh and static mesh, show the skeletal mesh editor, skeleton bones, rigs and imported animations from FBX, then spawn skeletal characters and enemies with spawn actor from class.

Explore how triggers in Unreal Engine 4 blueprints create overlap events with box, sphere, and capsule triggers, and test begin and end overlap in the level blueprint.

Create three trigger areas that spawn cubes at random positions within floor bounds, color them with a material parameter, then destroy them using level blueprint logic and a looping timer.

Learn to spawn cube actors at random locations via a level blueprint trigger, rotate and scale them, change colors with material parameters, and destroy random spawned actors with timers.

Discover direct communication between blueprints by creating a public light reference variable to access a point light in another blueprint, and toggle it with the F key.

Explore cast nodes to enable blueprint communication by connecting a sender to a receiver, using hierarchy-aware casting to access specific characters, controllers, or HUD, and handle cast failures.

Explore blueprint interface theory, where a sender broadcasts an interface message to receivers that implement the interface, enabling interactions with objects like lights and radios while non-interactive objects stay safe.

Learn to use a blueprint interface for object interaction, sending an Interact message from a character via a sphere trace and enabling rock and chair to respond with Interact events.

Create and wire blueprint interface inputs to pass named data from the interacting character to scene objects, then have rocks multiply numbers while chairs add them.

Explore blueprint interface outputs by adding an output parameter to the interface, turning it into a function implemented differently by each object, such as rock multiplying and chair adding.