Blueprint —— 入门笔记

蓝图比C++性能较慢；

蓝图起作用需在场景中创建实例；

在Event Graph内

• 按住右键，平移界面；
• 滚动滚轮，缩放界面；
• 按住左键+节点，移动节点；
• 右击，显示节点对话框；
• 按住左键+引脚，可拖出引线；
  • 按住alt+点击引脚，断开引线； 
  • 按住ctrl+点击引脚，重连引线； 

蓝图执行顺序

• Construction Script
• Event Graph
  • 只能一个事件开始，从左到右沿着白色引线执行；

多使用注释； 

不同类型的节点，用不同颜色标识；

变量类型：

• Boolean、byte、integer、integer64、float、name、string、text、vector、rotator、transform；

append，to lower/to upper，....

ctrl，get variable

shift，set variable

public、private，其他蓝图或子蓝图内是否能使用；

expose variables in the scene

spawn actors in the scene via buleprints

• spawn actor from class
  • expose on spawn

Array

Flow Control

• Branch
• Sequence
• For Loop
• While Loop
• Do N，从头执行N次；
• Do Once
• Flip Flop
• Gate
• MultiGate

Events

• when something  happens in your game;
• multiple events can be triggled at the same time;
• you can call and overlap events;
• events accept time actions：delay，timeline；
• events don't return values；
• they appear in the event graph；
• they don't have their own graph；

Functions

• action that is performed;
• they are like actions that triggers and bring results instant;
• they don't accept time actions;
• you can't accept custom events;
• they have their own execution graph;

Macros

• Macros is a collection of different actions;
• you can re-use it in your code multiple times;
• they don't accept time actions;
• they don't accept custom events;
• they accept input and output;
• they are not seen in C++;
• they have their own execution graph;

Collapse Graph

Enum

 switch on ...

Game Structure

Controller 只能控制一个pawn；

• get world location
• get world rotation
• get world scale
• get world transform

• get relative location
• get relative rotation
• get relative scale 3D
• get relative transform

• spawn actor from class
• Get All Actors of Class
• destroy  actor
• is valid

 

骨架mesh

trigger

Mesh Tags

• actor has tag

set timer by event

clear timer by function name

Blueprint Communication

• 直接在Character上，创建开门逻辑，创建变量引用BP_Door（instance editable）；Auto Possess Player；快捷键E（1不起作用）；
• Cast，通过cast访问到指定的蓝图类，在获取该蓝图类的事件等执行；

 Blueprint Basic

• sphere trace by channel
• Blueprint Interface，声明一个函数（定义蓝图间接口的函数）的蓝图；添加了此接口的蓝图，即拥有此函数；
  • event "interfacename"
  • 可创建输入、输出，此时将转化为函数；

Event Dispatcher

Game Mode

•  default pawn class：BP_MyCharacter

Grab Object

 

TimeLine

  

set timer by event

clear and invalidate timer by handle

set timer by function name

clear timer by function name

FPS = 1/Delta

• stat fps
• stat unit
• stat game
• t.maxfps 120

Vector

origin point 

Forward Vector：x轴

Right Vector

Up Vector

Rotate Vector

Rotation From X Vector

Find Look at Rotation

Velocity 

• get velocity

set scalar parameter value on material

set vector parameter value on material

create dynamic material instance

set scalar parameter value

set vector parameter value

Widget 部件

参考教程