ue4 popcornfx plugin 

you need a license for use popcornfx unreal plugin.(& VisualStudio 2015).

http://www.popcornfx.com/unreal-engine-4-plugin/

https://github.com/PopcornFX/UE4PopcornFXPlugin

https://github.com/PopcornFX/UE4PopcornFXPlugin/releases

http://wiki.popcornfx.com/index.php/UE4/Plugin_installation

http://answers.popcornfx.com/

https://ics.media/entry/10921

https://www.youtube.com/watch?list=PLcNLffz-XEF_PP1-ZxWqnmLt9uIu2v6fK&v=ApI1i83GLsg

https://forums.unrealengine.com/showthread.php?143821

download plugin

https://cdn.unrealengine.com/gdc/ShaderBits-GDC-Pack.zip

Ryan Brucks

Unreal Engine Live Stream - Realtime Simulation Volume Modeling Experiments 

www.twitch.tv의 UnrealEngine에서 라이브 동영상 시청

Write Volume Slices To A Texture from Mike Lyndon on Vimeo.

Material Function Reference

Blends / Gradient / Image Adjustment / Math / Misc / Opacity / Particles / Pivot Painter / Procedurals / Reflections / Shading / Texturing / VectorOps / WorldPositionOffset

https://docs.unrealengine.com/latest/INT/Engine/Rendering/Materials/Functions/Reference/index.html

https://docs.unrealengine.com/latest/INT/Engine/Rendering/Materials/Functions/index.html

Blend Functions

• Blend_ColorBurn
• Blend_ColorDodge
• Blend_Darken
• Blend_Difference
• Blend_Exclusion
• Blend_HardLight
• Blend_Lighten
• Blend_LinearBurn
• Blend_LinearDodge
• Blend_LinearLight
• Blend_Overlay
• Blend_PinLight
• Blend_Screen
• Blend_SoftLight
•  Lerp_ScratchGrime2

Gradient Functions

• Radial Gradient Exponential
• Diamond Gradient
• Linear Gradient
• Smooth Curve
• Value Step
• GradientMap_Multi

float smoothstep(float edge0, float edge1, float x) {
  // Scale, bias and saturate x to 0..1 range
  x = clamp((x - edge0) / (edge1 - edge0), 0.0, 1.0); 
  // Evaluate polynomial
  return x * x * (3 - 2 * x);
}

float clamp(float x, float lowerlimit, float upperlimit) {
  if (x < lowerlimit)
    x = lowerlimit;
  if (x > upperlimit)
    x = upperlimit;
  return x;
}

Mat- Raymarchheight function  test  (+  dynamiclight shadow.)

UE4 RayMarchHeight (Material) Test from JeongukChoi on Vimeo.

https://forums.unrealengine.com/showthread.php?119267-Your-thoughts-on-and-comments-to-Volume-Rendering-in-Unreal-Engine-4

Shader Development

https://docs.unrealengine.com/latest/KOR/Programming/Rendering/ShaderDevelopment/index.html

Creating Volumetric Ray Macher - Ryan Brucks

http://shaderbits.com/blog

http://shaderbits.com/blog/creating-volumetric-ray-marcher

Watch Dogs2 - Ray Marched fog

https://www.videogamer.com/news/watch-dogs-2s-pc-only-ray-marched-fog-looks-amazing

https://forums.unrealengine.com/showthread.php?54521-Clouds-via-ray-marching

SideFX GDC 2017 presentation - Volume to mesh in Battlefield 1

Star Citizen Explosion - frame blending

https://realtimevfx.com/t/star-citizen-explosion-vfx-breakdown/632/10

from 14m 19s

Allumette Vr

http://www.penrosestudios.com/stories/2016/4/13/introducing-allumette

Material Expression Reference

https://docs.unrealengine.com/latest/KOR/Engine/Rendering/Materials/ExpressionReference/index.html

Atmosphere

Color

Constants

Coordinates

Custom

Depth

Font

Functions

MaterialAttributes

Math

Parameters인스턴스 재질에 사용.

Particles

Terrain

Texture

Utility

VectorOps

Vectors

기호 rad. 각도의 단위. 국제단위계(SI) 단위이다. 반경 1의 원에서 길이 1의 원호(圓弧)에 대한 중심각이 1라디안이다. 따라서 360°＝2πrad, 1rad＝57.2958°이며 삼각함수의 전개 등을 취급할 때의 단위는 라디안이다.

# cast to , blend space not test

BluePrint Flow control node

https://docs.unrealengine.com/latest/KOR/Engine/Blueprints/UserGuide/FlowControl/index.html

• Switch Nodes
  • Editing Switch Nodes [Switch on int] index값에 따른 선택.
• Standard Flow Control Nodes
  • Branch - True/False 조건 분기
  • DoN - N 수만큼 실행
  • DoOnce - 1번만 수행 DoN N=1과 동일
  • FlipFlop - A,B를 번갈아 가면서 실행
  • ForLoop - First index가 Last Index 될동안 loop
  • ForLoopWithBreak - ForLoop에 break 조건 추가
  • Gate - gate 상태에 따라 exit 출력
  • MultiGate - 여러개 동시출력, random  출력 선택 
  • Sequence - 순서대로 실행
  • WhileLoop - True -무한 루프 False 중단 (무한 루프에 빠지지 않도록 주의)
  • 
    

Physical Materials

https://docs.unrealengine.com/latest/KOR/Engine/Physics/PhysicalMaterials/Reference/index.html

Friction (마찰), Restitution (복원력), Density (밀도)

Landscape materials

https://docs.unrealengine.com/latest/INT/Engine/Landscape/Materials/index.html

blend space

https://docs.unrealengine.com/latest/KOR/Engine/Animation/Blendspaces/index.html

https://docs.unrealengine.com/latest/KOR/Engine/Animation/AnimHowTo/BlendSpace/index.html

Cast To (형 변환)

https://docs.unrealengine.com/latest/KOR/Engine/Blueprints/UserGuide/CastNodes/index.html

Spring Arm (Camera)

https://docs.unrealengine.com/latest/INT/Gameplay/HowTo/UsingCameras/SpringArmComponents/index.html

CameraLag 은 카메라가 오브젝트 뒤를 약간의 시간차를 두고 따라다니게 할 때 좋습니다.

Media player (Video texture)

https://docs.unrealengine.com/latest/INT/Engine/MediaFramework/index.html

https://docs.unrealengine.com/latest/INT/Engine/MediaFramework/TechReference/Upgrading/

https://docs.unrealengine.com/latest/INT/Engine/MediaFramework/HowTo/MediaPlaylists/index.html

Staticmesh Morph Target

https://docs.unrealengine.com/latest/KOR/Engine/Content/Types/StaticMeshes/MorphTargets/index.html

FBX morph target pipeline

https://docs.unrealengine.com/latest/KOR/Engine/Content/FBX/MorphTargets/index.html

Material Parameter Collections

https://docs.unrealengine.com/latest/KOR/Engine/Rendering/Materials/ParameterCollections/index.html

Line trace

https://docs.unrealengine.com/latest/KOR/Gameplay/HowTo/UseRaycasts/Blueprints/index.html

Blueprint interface - 블루프린터 이벤트 콜을 bp interfaces 통해서 호출

참고 - # cast to   # actor has tag

https://docs.unrealengine.com/latest/KOR/Engine/Blueprints/UserGuide/Types/Interface/index.html

https://docs.unrealengine.com/latest/KOR/Engine/Blueprints/UserGuide/Types/Interface/UsingInterfaces/index.html

Press pointer key /  Release pointer key (키를 마우스 버턴으로 설정가능)

https://docs.unrealengine.com/latest/INT/BlueprintAPI/Interaction/index.html

Difference between event graph and construction script?

https://forums.unrealengine.com/showthread.php?9206-Difference-between-event-graph-and-construction-script

Math Expression

round / ceil / floor  반올림/올림/내림

Pure Function (option)

https://docs.unrealengine.com/latest/KOR/Engine/Blueprints/UserGuide/Functions/index.html#purevsstopimpure

순수 함수는 어떤 식으로든 클래스의 멤버나 상태를 변경하지 않기로 약속한 반면, 비순수 함수는 자유롭게 상태를 변경할 수 있습니다. 순수 함수는 일반적으로 값을 구해오거나 데이터 값을 출력하기만 하는 작업에 사용됩니다.

variable : Byte  8 bit (0~255)

Vertex Animation Tools

https://docs.unrealengine.com/latest/KOR/Engine/Animation/Tools/VertexAnimationTool/index.html

 -keyframed mesh

https://docs.unrealengine.com/latest/KOR/Engine/Animation/Tools/VertexAnimationTool/VAT_KF_Meshes/index.html

 -timeline mesh

https://docs.unrealengine.com/latest/KOR/Engine/Animation/Tools/VertexAnimationTool/VAT_TL_Meshes/index.html

Pivot Paint Tools

https://docs.unrealengine.com/latest/KOR/Engine/Content/Tools/PivotPainter/index.html

Tutorial

https://www.youtube.com/watch?v=eXWpIveSiIQ&list=PLvK_7V0A67Z7iioEoLRTv7VxM_ILKjFa6&index=10

Texture Object

https://docs.unrealengine.com/latest/KOR/Engine/Rendering/Materials/ExpressionReference/Textures/index.html#textureobject

Customized UV

https://docs.unrealengine.com/latest/KOR/Engine/Rendering/Materials/CustomizedUVs/index.html

- Use Full Precision UVs (최대 정밀도 UV 사용) 

Vertex Animation GDC Project Overview(Houdini)

https://vimeo.com/207832662

Vertex Animation GDC Project Overview from Luiz Kruel on Vimeo.

Project and Source files can be downloaded from

https://www.dropbox.com/s/7ihdawwj2a03jr8/GDC2017_VertexAnimationTextures.zip?dl=0

vertex_animation_texture_overview from Luiz Kruel on Vimeo.

Tips and Tricks: Importing RealFlow meshes in Unreal!

Object Animation

SideFX Houdini UE4 Plugin | Developer Interview | Unreal Engine

https://www.youtube.com/watch?v=Jjpeeq7KO2Y

http://norman3d.com/TextureMorphTargets/Vertex-count-agnostic_Morph_Targets.pdf

https://forums.unrealengine.com/showthread.php?133203

http://www.gamasutra.com/blogs/TequilaWorks/20160620/275347/How_to_take_advantage_of_textures_in_the_vertex_shader.php

Vector Displacement Map

https://forums.unrealengine.com/showthread.php?5886-Vector-displacement-map

Particle Reference

https://docs.unrealengine.com/latest/KOR/Engine/Rendering/ParticleSystems/Reference/index.html

particle instance parameters tut

https://wiki.unrealengine.com/Particle_Instance_Parameters_Tutorial

random emitter spawn in box volume

https://answers.unrealengine.com/questions/25155/how-to-make-a-particle-systems-initial-location-af.html

Particle Expression

https://docs.unrealengine.com/latest/KOR/Engine/Rendering/Materials/ExpressionReference/Particles/index.html#particlepositionws

Vector Operation Expression

https://docs.unrealengine.com/latest/KOR/Engine/Rendering/Materials/ExpressionReference/VectorOps/index.html

Point Cloud

https://forums.unrealengine.com/showthread.php?91501-How-to-place-single-GPU-particles-at-specified-locations

Destructible Mesh (Fracture)

Mesh create or import > Fracture create or import fbx

Destructible Properties Matrix

https://docs.unrealengine.com/latest/KOR/Engine/Physics/Destructibles/DestructibleProperties/index.html

https://docs.unrealengine.com/latest/INT/Engine/Performance/SystemSettings/index.html

https://docs.unrealengine.com/latest/INT/Videos/PLZlv_N0_O1gYeJX3xX44yzOb7_kTS7FPM/-gGiEmYj4oE/

https://forums.unrealengine.com/showthread.php?922-Destructible-Meshes-Two-Part-Tutorial

https://www.youtube.com/watch?v=sKJlB_ep3lU

to move at a constant speed you can control, you should use Velocity directly. Add Impulse basically does Velocity+=impulse. while AddForce is more like a thruster, it accelerates.

Currently the only way to have multiple fractures is to import an APB file. You can use PhysXLab for that.

- RadialimpulseActor

impulse: 충격,폭파 + 가속도

force: 원점에서 밀어내는 힘.

https://docs.unrealengine.com/latest/INT/BlueprintAPI/Physics/index.html

https://docs.unrealengine.com/latest/INT/BlueprintAPI/Physics/Components/RadialForce/index.html

https://docs.unrealengine.com/latest/KOR/Resources/ContentExamples/Physics/1_3/index.html

https://forums.unrealengine.com/showthread.php?29496-Addforce-and-addimpulse

AddForce accounts for delta time and should be used for applying force over more than one frame, AddImpulse does not account for delta time and should be used for single 'pushes', like from an explosion or being thrown by a player. The reason is that if you use AddForce for throwing or an explosion, how far the object moves depends on the framerate at the exact frame the force was applied, rather than being independent of framerate like AddImpulse is

Destructible_Troubleshooting_Guide

https://wiki.unrealengine.com/Destructible_Troubleshooting_Guide

NVIDIA Apex

https://developer.nvidia.com/apex-destruction-physxlab-tutorials

ue4 fracture 는 1depth 가능

apex 는 5depth 가능

Demolition Master

http://www.andvfx.com/demolition-master/

# ue4에서는 메쉬 애니메이션 bake하지 않고 fbx 애니메이션 익스포트만으로도 애니 데이타가 넘어감.(rootbone 설정은 해줘야 하나의 오브젝트로 됨)

QuickBone Tool 1.0  - mesh animation baking script

http://www.michalorzelek.com/blog/maxscript-quick-bone-tool-1-0/

https://www.youtube.com/watch?v=iQ6HFdP8_C4

Physics Body Reference

https://docs.unrealengine.com/latest/KOR/Engine/Physics/PhysicsBodies/Reference/index.html

Collision Response Reference

https://docs.unrealengine.com/latest/INT/Engine/Physics/Collision/Reference/index.html

Using the OnHit Event in Blueprints

https://docs.unrealengine.com/latest/KOR/Gameplay/HowTo/UseOnHit/Blueprints/index.html

properties

Destructible Settings

>Damage

 Damage Threshold : 메쉬 HP 값

 Damage Spread  : Damage Radius = 데미지 x Damage Spread

 Enable Impact Damage : 부딪치는 오브젝트,프렉쳐등에 충격 데미지 /  무너지는 효과 

 Impact Damage :  Damage = Impact Force x Impact Damage

 Default Impact Damage Depth : Damage Depth

 Custom Impact Resistance : 오브젝트와 충동시 밀어내는 값 

 Impact Resistance : chunks가 물리적 데미지를 입을때 저항값, 낮게 설정하면 관통될수 있다. 

                           충돌 오브젝트  collision preset : PhysicsActor / weight 값 설정.

 -------------------

 Damage Cap : 최대 데미지 총합. 이값 이상의 데미지는 적용되지 않게 되고 파괴되지 않는다.

 Impact Velocity Threshold : 최저 속도 한계치, 한계치 속도 이상이 되어야 파괴.

 Max Chuck Speed : 최대 chunk속도, 낮은값이면 slomotion 처럼 보인다.

 Fracture Impulse Scale :파괴시 chunk 노멀 방향으로 조각난 것을 밀어내는 크기 인수.

>Debris

 잔해 life time min/max , 원점에서 멀어지면 사라지는 거리, valid bounds 크기 설정

>Flags

 Accumulate Damage : 데미지 누산, 여러번 타격 가능.

 Asset Defined Support :  support chunk 설정된 fracture에 nxscene 적용 ?

 World Support : 스태틱 메쉬와 겹치는 부분에 레벨 환경적용. 바닥에 붙거나 벽에 붙는 역할

 Debris Timeout : 잔해 timeout 설정

 Debris Max Seperation : 잔해 원점에서의 최대 거리 설정

 Crumble smallest Chunks : 가장 작은 chunk도 분해 or 삭제

 Accumulate Raycasts : 정확한 collision 검사

 Use Valid Bounds : Valid bounds 사용.

 Form Extended Structures : 겹치는 오브젝트와 하나가 된다.

>Hierarchy Depth

 chunk depth 설정. depth level에 따라 "stick"형태로 된다.

>Effects

  이펙트 추가

>Skeletal Mesh

 재질 설정

>Thumbnail

Fracture Settings

>Voronoi

 Cell Site Count : cell chunk 수

 보로노이 다이아그램

 http://terms.naver.com/entry.nhn?docId=3533967&cid=58541&categoryId=58541&expCategoryId=58541

 3dsmax rayfire voronoi

 https://www.youtube.com/watch?v=Uu2PYfK3HdY

 # fracture import 시 Material 통합문제 현재 해결되지 않았음 -> APEX는 가능.

 https://issues.unrealengine.com/issue/UE-8566

>General

 fracture 재질 uv 설정, random 생성.

Chunk Parameters

>Chunks

 Chunk Params 

 Is Support Chunk : 레벨 환경에 지원

 Do Not Fracture : fracture되지 않음

 Do Not Damage : 데미지 입지 않음

 Do Not Crumble : 부서지지 않음 , 자식이 있는 청크는 자식쪽에서 부서질수 있음.

Destructible Actor Component

Linear Damping : 높을수록 느려짐

Large Chunk Threshold : Fracture 충돌 사이즈. 수치를 높이면 그이하의 덩어리는 플레이어와 충돌하지 않음.

~ console command : pxvis collision

Destructible Troubleshooting Guide

https://wiki.unrealengine.com/Destructible_Troubleshooting_Guide

UE4 Learning Resource Content Creator Tim Hobson

http://timhobsonue4.snappages.com/

https://forums.unrealengine.com/showthread.php?56777-TUTORIALS-Photons-Be-Free-Mini-tutorials-and-other-curiosities

ue4 Apex,rayfire Destructibla mesh tut

https://www.youtube.com/watch?v=HSGCr-xqit0&index=2&list=PLm2aqn-LqKX6VJfACurmJEK7YSwerMIa6

Fracturemesh Chunks location (code)

https://answers.unrealengine.com/questions/102537/get-location-and-rotation-of-a-chunk-destructable.html