VR and Game Engine Workflows with CityEngine...Unity vs Unreal: Tech •Unreal more built-in...
Transcript of VR and Game Engine Workflows with CityEngine...Unity vs Unreal: Tech •Unreal more built-in...
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VR and Game Engine Workflows with CityEngine
Eric Wittner, Taisha Waeny
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Agenda
• Introduction into Game Engines - Taisha
• User Examples - Taisha
• GIS2VR workflow: CityEngine to Unity - Eric
• GIS2VR workflow: CityEngine to Unreal - Eric
• Unreal Basics & Principles - Eric
• CityEngine VR Template - Eric
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• Unity vs Unreal
Introduction into Game Engines
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GIS to Game Engines
GISdata
Game engine (Unity & Unreal) professional XR dev environment
CityEngine
CityEngine VR Experienceout-of-the-box premium VR via Unreal project template
ArcGIS 360 VRout-of-the-box mobile VR for Oculus Go & Samsung Gear
FBXDatasmith
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Architectural Visualization
“Unreal Engine is 4th most used production renderer (including offline renderers)” CGarchitect2018 Survey
Industry is using game engines for high-end 3D real-timevisualization
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Movie
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What is a Game Engine?
A SW dev environment designed for people to build video games:
- Rendering engine for 2D or 3D graphics
- Physics engine, collision detection
- Spatial audio rendering
- Animation, artificial intelligence
- Scripting, scene graph
- Video support for cinematics
- Networking, memory mgmt, threading, localization support …
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Why Game Engines?
A SW dev environment designed for people to build video games
An environment designed for people to build experiences
Experience != line of sight tool with which you can do multiple things
Experience = use-case specific intuitive real-time UX e.g. find sniper
…BUT: game engines don’t support geo-referencing!!!
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Unity vs Unreal
Both are for free as long as you basically don’t publish “exe”
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Unity vs Unreal: Tech
• Unreal more built-in features (Blueprints, Material Editor, etc.)
-Unity catching up on features (Material Editor)
- Some available via plugins (not all of them for free though)
- Replicating high-end features of Unreal can be complicated in Unity
• Unreal default materials and assets are of higher quality
• Unreal tends to better suited for HQ/performance applications
- E.g. global illumination system of Unity not dynamic and slower
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Unity vs Unreal: Development
• Unreal has built-in visual scripting called Blueprint
• Development in Unity in C# & JavaScript and in Unreal in C++
• Source code for Unreal is public for everybody!!!
• Unreal exceptionally good for devops & source code mgmt.
• Unity supports more platforms (Nintendo Switch etc.)
• Both support browser - but stability & performance lacking…
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Unity vs Unreal: Adoption
• Unity tends to be more beginner friendly
• Unity has more indie developers i.e. asset store of Unity is bigger
• Epic Games supporting non-game applications more
• Unreal used about 3 times more than Unity in architectural viz
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Vrbn, City of Zurich, HOK
CityEngine User Examples
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• FBX-based Workflow
GIS2VR: CityEngine to Unity
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CityEngine: Select, «Export Models...»
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Choose FBX, Tweak Settings, & Click Finish
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Unity: Drag&Drop FBX to Assets & into scene
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Move «Main Camera» to center
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Enable VR
• Edit, Project Settings, Player
• Check «Virtual Reality Supported»
• Add OpenVR Support
- Click «+», «OpenVR»
- Drag above «Oculus»
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Start in VR: Press «Play» and experience it in HTC Vive
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VR: Add Locomotion
• Window, «Asset Store»
• Search «SteamVR Plugin»
• «Import»
• «SteamVR_Settings» Dialog
- «Accept All»
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Add «Player»
• Delete «Main Camera»
• Drag in
«SteamVr\
InteractionSystem\
Core\Prefabs\Player»
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Add «teleport» prefab
• Drag in
«SteamVr\
InteractionSystem\
Teleport\
Prefabs\Teleporting»
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Add Teleport Points
• Drag in multiple
«SteamVr\
InteractionSystem\
Teleport\
Prefabs\TeleportPoint»
• Optional: Increase
their scale
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In VR, Teleport Using Click on Wheel
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Teleport anywhere
• Click Mesh in Assets
• «Generate Colliders»
• «Apply»
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Teleport anywhere
• Double-click street
• Copy/Paste
• Drag
«SteamVr\
InteractionSystem\
Teleport\
Scripts\TeleportArea»
on street copy
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In VR, Teleport Anywhere on Street
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• Datasmith-based Workflow
GIS2VR: CityEngine to Unreal
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Unreal Material Handling in CGA Rules
In CityEngine
• (Optional) Modify CGA rules to assign appropriate Unreal
materials
• Export scene with Datasmith exporter
In Unreal
• Create CityEngine Template project
• Import Datasmith file into Unreal
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CityEngine to Unreal Workflow Overview
• set(material.shader, «path/to/material/in/unreal/») in CGA
• Template has 3 uber-shaders (opaque, semi-transparent, masked)
• Or create custom materials in Unreal and reference them from
CGA
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Exporting from CityEngine
• Options to modify
mesh granularity
• Choose between
standard instancing
& foliage system
• Datasmith takes
care of game
engine
optimizations
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Importing into Unreal
• Create CityEngine Template Project
• Open project and import Datasmith file
• Default options fine for normal sized meshes
• For lightmap baking the lightmap resolution
might need tweaking
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• Quickstart Guide
Unreal Basics & Principles
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UI
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Material Handling
• De-facto standard for
material definition
• Graph-based editor UX
• Custom nodes can be
created with HLSL code
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Visual Effects: Height Fog
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Visual Effects: Atmospheric Fog
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Postprocessing
• Depth of Field
• Lens effects
- Vignette
- Chromatic
Aberration
- Bloom
• Color Grading
• Ambient occlusion
• …
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Development Example: UI Popup
• Popup with metadata (CSV) exported from CityEngine
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Widget Designer (UMG)
• Can either be HUD
based or in-game UI
elements
• Functionality can be
added using
Blueprints
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Blueprint Example
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Blueprints or C++?
Typically computational expensive
methods should be written in C++,
everything else via Blueprints
• Create C++ Actor class with
special annotations
• Create Blueprint Actor based
on this C++ class
• Call function from Blueprint
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C++ Example
UCLASS()class BLUEPRINTCPPTEST_API AMyActor : public AActor{
GENERATED_BODY()
UFUNCTION(BlueprintCallable)void ExpensiveFunction();
}
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CityEngine VR Experience
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Based on the Tabletop UX
• Common UX pattern
in MR, VR & AR
• Collaborative
• Intuitive, people
relate to table
• Specific for selected
urban planning
workflows
© 2017 City of Zurich
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Using the CityEngine VR Experience
• Create CityEngine VR Experience Project
• Open project and import Datasmith file (optional: import own room)
• Set-up points of interest
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Get in touch with us…
TaishaLinkedIn: www.linkedin.com/in/taishawaeny
Email: [email protected]
Erichttps://www.linkedin.com/in/eric-wittner-26002b21
Email: [email protected]
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