[Chaos Physics] Unreal Engine 5.2 物理約束可掛接拖車車輛教學 ｜Physics Constraint Hitchable Trailer

物理約束可掛接拖車車輛

在這邊使用 Driving Chaos Vehicle 專案來製作掛接拖車

匯入模型和貼圖: Crab the model and texture into Browser

拖車已經有綁訂了

FBX import Options:

Skeletal Mesh: turn on

Combine Meshes: If you have many separate mesh, you could turn on

Plugins:

ChaosVehiclesPlugin

WheeledVehiclePawn

Create BP:

Right click mouse > Blueprint Class

All Classes:

search: vehicle

Select “ WheeledVehiclePawn ”

Mesh >  Skeletal Mesh Asset > trailer

Wheel Setup

選擇  Vehicle Movement Component

這個拖車有兩個輪子，所以按兩次+ 增加

Wheel Setup > Wheel Setups > +  

到骨頭檔案並複製骨頭名字

選上骨頭 > 右鍵 > Copy selected Bone Names

 Paste to Wheel setups index bone name

Turn on Simulate Physics

Trailer Physic 拖車物理

Open physics Asset

Select physic and delete

因為預設的物理形狀不符合拖車

Select wheel bones > Primitive shape: Sphere >Add bodies

Select Root bone > Primitive shape: Single convex Hull >Add bodies

Input Action

Project settings

Go to Engine - Input

Action Mappings: Interact--> T

Animaton

Obtain the behaviors we want for our vehicle.

Select trailer skeleton > right click mouse > Create > Anim Blueprint

Opne AnimBP > Class Settings > class options > Parent Class : Vehicle Animation Instance

Mesh Space Ref Pose: this is used to return the mesh space reference pose for our skeletal mesh in the Animation Blueprint

Wheel Controller : offloading a lot of the work in creating these types of animations, you can use the Wheel Controller Node to drive the animations.

GO to BP_trailer

Select Mesh > Animation > Anim Class : ABP_trailer

準備互動物件

Open BP_CAR

增加碰撞體 ，命名為 Docking.

Blueprint > Blueprint Interface

藍圖介面是一個或多個函數的集合 - 僅名稱，無實作 - 可以新增到其他藍圖。 這本質上就像一般程式設計中介面的概念，它允許多種不同類型的物件透過一個公共介面共享和存取。

Functions: Interact

Inputs: car (BP_Car, object reference)

Open BP_car

Use for loop to check does implement interface, if true, does interact

Opne BP_Trailer

Add Collision

Naming: Trigger_coli

Add PhysicsConstraint

物理約束是一個關節，可讓您將兩個 Actor 或組件連接在一起，並對它們施加限製或力。

Constraint

Conponent name 1: Mesh

Conponent name 2: Trigger_coli

Control Physics constraint - Angular Limits

Swing 1 motion  (Z) : Limited, swing 1 limted: 60

Swing 2 motion (x): Locked

Twist motion (y): Locked

Add Text Render

1. Text: type the information.

2.Turn off visibility

Add cube

In order to let trailer to stand on the ground, so add cube

Add Interface

Class Settings > Implemented Interfaces > select BI_Interact

Add variables:

1. CanHitch :Boolean

2. TryHitch : Boolean

Select trigger_collision box add begin overlap and end overlap

When End overlap,  try Hitch: turn off, and text does not show

When begin overlap,  try Hitch: turn on

Get  car docking and trailer trigger_coli’s world location and do float to integrate value

Does car docking X subtract trailer trigger X to get the value. The value is less equal what we want the value. However, we might be get the negative value, so here I use ABS to get positive value.

Does car docking Y subtract trailer trigger Y to get the value. The value is less equal what we want the value.

X and Y value both are true and return true.

Set true/false to can Hitch

Set text visibility and delay the time.

After completed, try hitch again to condition, if true, cast to bp_Car

Interact Event

如果可以掛接，則汽車連接到拖車且移動並設置約束組件。 關閉嘗試掛鉤並設定文字可見性。

否則，當再次按下T時，釋放油門並打破約束，並設定嘗試掛接：打開

Result:

Stand

當汽車連接到拖車時，支架就會消失。

Creat function: RemoveStand

Add Variables: StandRemovedBool :bool

Open RemoveStand function:

Destory stand compoent, and set standRemovedBool: on, and call stand removed

Event Dispatchers: StandRemoved

Event graph

Using event tick to do event StandRemoved.

如果支架有效，請移除支架。 如果沒有，則執行一次列印字串

Event Interact:

Remove stand event and turn off standRemovedbool

Result:

Youtube Tutorial:

Plugins: ChaosVehiclesPlugin

Sketchfab  -  Car Scene:

https://sketchfab.com/3d-models/car-scene-b7b32eaca80d460c9338197e2c9d1408

Sketchfab  - Generator Trailer:

https://sketchfab.com/3d-models/generator-trailer-c07a679eadb64c15b26cb063b8a736ae

Physics Constraint Component:

https://docs.unrealengine.com/5.2/en-US/physics-constraint-component-user-guide-in-unreal-engine/

How to Set up Vehicles Unreal Engine 5.0

https://docs.unrealengine.com/5.0/en-US/how-to-set-up-vehicles-in-unreal-engine/

Ref: Unreal Engine Truck Tutorial: Trailer System

https://www.youtube.com/watch?v=YLoOH24sKf8

教學專案和文件下載 /  Full Project and Document Download:

https://www.patreon.com/posts/chaos-physics-5-91934426?utm_medium=clipboard_copy&utm_source=copyLink&utm_campaign=postshare_creator&utm_content=join_link

贊助 / Support Me

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