UE4 official AEC blueprint case course learning notes

Official website ：https://learn.unrealengine.com/course/2938064?r=False&ts=637944176479533337
B Website address ：https://www.bilibili.com/video/BV1E7411p7a3?p=1&vd_source=707ec8983cc32e6e065d5496a7f79ee6

Tutorial introduction

• The tutorial focuses on blueprints , Made Trigger Triggered automatic door , Ray triggered lamp , In edit mode, it automatically adsorbs the ceiling light and the chair with proximity prompt and can change materials
• The tutorial is relatively simple , Beginners suggest starting to learn , Appreciate the charm of the blueprint

Make automatic door

• UE in , Generally, an interactive object will be encapsulated into a blueprint class , All models are included 、 Actions and external interfaces . Implement a very clear concept of classes .
• Blueprint class Actor, Analogy to Unity Of GameObject; Generally, interactive objects will be established Actor
• Build a BP_AutoDoor
  
• Add a Box Collison, In this way, it can be used in the blueprint class ActorBeginOverlap and ActorEndOverlap event （ Here, events are a little automatically bound ）

Be careful ：Box As big as possible , Keep the moving door from leaving Box The scope of the , Otherwise, when the moving door opens , Except for the characters who leave Bug

• TimeLine Is a function that returns a set value over time . Here, curve animation is provided for opening the door . combination Box The entry and exit of the collision body , Realize the corresponding actions of forward and backward broadcasting .
• TimeLine What is offered is 2 second ,0-1 A curve change of , Back combination Lerp Of Alpha value , from A It's worth it B Change in value , These are conventional usage .
• In the case , Get the position of the door , Used Get Relative Transform, Use Get Relative Location It's the same .

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Ray triggered lamp

• UE in , On the character 、GameMode Inside ,Level Blueprints It will write some public code , as well as Input Some action keywords will be set in ; In this case , On the character , You need to write the code to trigger the light switch .
• The objects involved here are ：
  （1） role ： The mouse click , Emit detection rays , And detect the object type , Is the object of compliance , Then send the interface action command to this object Light Switch
  （2） switch ： Set up Light Switch Interface , And all the lights Switched Interface command
  （3） The light ： Set up Switched Pick up , And according to FlipFlop（AB Rotation ）, Set the light intensity
• Ray logic ： Set up Start And End Ray distance of , There is contact with objects , Determine the type of object , The category is correct , Then send the interface command .

Object encapsulation action , Open interface

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Automatically adsorb the ceiling

• Construction Is running in the editor , It realizes the function of simply adsorbing the ceiling ; If adsorbed on the ground , Press only PageDown that will do

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Chairs with different materials

• Combined with the above case , Not hard to solve
• Prompt text triggered by collision body
• use SetMaterial Set the preset material

Blueprints , You can drag the model or another blueprint in the main window , To this blueprint class ; Not necessarily Add Component Button

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summary ：UE comparison Unity, Have a very rigorous packaging concept ; so , It is suggested to put a model Mesh、 Blueprint class 、 texture of material 、 Mapping （ If there is no reuse ） It can be put together , It is more conducive to project migration .