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Interactive World V1.3 Wind & Fog
Documentation
Sun BoHeng Create interactive snow, mud, water and foliage, fog area and wind field in large world. Catalogue Features ................................................................................................... 2 World Drawing Board ....................................................................... 2 Brush ................................................................................................ 3 Features of Snow Simulation ............................................................ 3 Special Note ............................................................................................. 3 Limitations ....................................................................................... 3 Noteworthy points ........................................................................... 4 Quick Start ............................................................................................... 5 Step 0: Before Start .......................................................................... 5 Step1: Add Function to Your Materials ............................................. 8 Step 2: Attach Interact Brush to Your Character ............................. 13 Step 3: Set Interact Area with Interact Volume .............................. 15
Step4:Active Drawing Board ........................................................... 18 Settings .................................................................................................. 20 World Drawing Board ..................................................................... 20 Interact Brush ................................................................................ 23 Use Guide .............................................................................................. 26 Use Low-Quality Snow Simulation .................................................. 26 Further optimization: ..................................................................... 27 Use with Sequencer ....................................................................... 28 Use with Swimming and Boats ....................................................... 30 Wind and Fog ................................................................................. 30 Flow map ....................................................................................... 32 UPDATE .................................................................................................. 33 Update Guideline ........................................................................... 33 Update Log ..................................................................................... 35 My Videos about This Plugin .................................................................. 37
Features
World Drawing Board
Snow trails Water waves simulation Foliage(grass) interact
rectangle,whose X not equals Y,but Brush will draw incorrectly when there are rotation in Brush or Drawing Board.You’d better set Render Target size And “Canvas World Size” as a square. Although you can find “Canvas World Yaw” in “BP_DrawingBoard”. This system dose not support setting “Canvas World Yaw” in some of the Drawing Boards.Currently, it works well only when “Canvas World Yaw”=0. In current version,you can’t resize RT or “Canvas World Size” in runtime,or the simulation will be incorrect.But you can set Canvas Location(That’s enough).
Noteworthy points
The snow trail simulation is not an efficient way.It need 3 RGBA16f Render Targets to record snow self-shadow,age,and keeps trails from afar with lower resolution.I wanted to add some special and useful features.In future version I will add an simple snow drawing board. (Added in Version 1.1) Wheel trail brush would draw incorrectly if turning radius is less than wheel width in some time. World Interact Volume sometimes doesn't work after compiling the code.You should use Brush Editing Mode in editor and edit the Brush(just move an vertex or something) to refresh it’s collision.
I want to find a job.So,this plugin is for job hunting in a sense.
Quick Start
Step 0: Before Start
Download Demo Project(Optional)
All assets of this project is from “Starter Content” and “Third Person Template” You can download this project(Please install this plugin at first),to see how to create a interactive world with this plugin. LingFengSBH/InteractiveWorldDemo: Demo project of Unreal Engine plugin "InteractiveWorld" (github.com) This project mainly shows using RVT and VHF to create snow deformation in world. And there are a snow interact particle in this project.
Enable InteractiveWorld plugin
means the input is not completely suitable for your project.This plugin uses input of Third Person Template in UE5.0. You may find that when you open blueprint “BP_IW_Character” in “Plugins/InteractiveWorld/Content/Demo/Blueprints/BP_IW_Character. uasset” You can copy input blueprints in your character to this blueprint and delete old ones.
Step1: Add Function to Your Materials
Find Material Functions
Snow
Add “MF_SnowInteract” to your snow material
Normal:Normal form height map,you can blend it with your mud normal as normal output Height:Mud height,1,less than 1 means it is stepped on.
Water
UV:UV of Render Target,if you want to sample Output RT of Drawing Board,you should use this UV,so that it will be mapped on the ground. Mask:It is where Drawing Board simulate. Normal:Normal of water wave. HeightMap:Water deform height map
Foliage
UV:UV of Render Target,if you want to sample Output RT of Drawing Board,you should use this UV,so that it will be mapped on the ground. Mask:It is where Drawing Board simulate. TurbulenceStrength:Intensity of turbulent. You can use it as WindIntensity of “SimpleGrassWind”.
Fluid(V1.3)
UV: UV of Render Target,if you want to sample Output RT of Drawing Board, you should use this UV,so that it will be mapped on the ground. Mask: It is where Drawing Board simulate. Velocity Field: Velocity of fluid in current position. It is normalized velocity in render target, (1,0) means it can move from (0,0) to (1,0) on UV of RT in 1 second, if you want to get velocity in world, you should multiply it by Canvas world size. New World Position: It is position after advection. For example, you
Foliage: Fluid (V1.3)
Step 2: Attach Interact Brush to Your Character
Find Interact Brushes
Brush Types Introduce
BP_Brush_Turbulent Designed for Foliage&Water
Draw a sphere falloff,the strength is depending on movement velocity. BP_Brush_Wheel Designed for Mud&Snow Draw a continuous tire tracks X Axis should point to the wheel rotation axis BP_Brush_MudStep Designed for Mud It draws only when you call function “Draw Brush”. You’d better use animation notification to call it’s “Draw Brush” function. Find “BP_ThirdPersonCharacter” to see how blueprints runs Find “ABP_Manny” and related animations to see how animation are set. BP_Brush_Shape Designed for Snow Draw a shape on snow.Like box,sphere.
Set Interact Area
Switch to Brush Editing Mode and edit volume brush
Examples:
Alt+O or open volumes visualization on panel
Bind Interact Volume
If you want to use Interact Volume.Enable “Use Interact Volume” Then add Interact Volumes into Array
Settings
World Drawing Board
Debug output RT on screen
Enable “Debug Output RT” and the debug UI will be added on screen in runtime
Common Settings
Simulate World Size:Unit:cm.The world size that the Drawing Board will simulate.For example,when you set it as 1024,the Drawing Board canvas size will be 1204cm*1024cm in world. Edge Falloff:A falloff in the edge of Drawing Board.For example,snow
