Boosting Frame-rates in Unity Games Using Umbra 3

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SAMPO LAPPALAINEN

UMBRA SOFTWARE

Boosting Frame-rates in Unity Games with

Umbra 3

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UMBRASOFTWARE

OCCLUSION CULLING MIDDLEWAREFOR TRIPLE-A GAMES

RELATIONSHIP WITH UNITYSTARTED IN 2010

FOUNDED IN 2007

14 EMPLOYEES

BASED IN HELSINKI, FINLAND

SUPPORT OFFICE IN SEATTLE, WA

SAME PROBLEM – DIFFERENT SOLUTIONS

“Level artists are there to fill theworld with content. Integrating Umbra saved us not only artist time but the time to create and maintain an efficient visibility culling solution. Umbra’s support provides us with the solutions and features that we need.”

“Umbra’s technology is playing an important rolein the creation of our next universe, by freeing our artists from the burden of manual markups typically associatedwith polygon soup.”

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Video GamesPowered by Umbra 3

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CHECK OUR PRESENTATION THURSDAY 2:30PMROOM 301 SOUTH HALL

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Occlusion Culling: Why Bother?

Umbra 3in a Nutshell

POLYGON SOUP OCCLUSION DATA

VISIBLE OBJECTS

OCCLUDER

GENERATION

VISIBILITY

QUERY

OVERVIEW

VISIBILITY DATA GENERATION

1. CONVERT INPUT POLYGON SOUP INTO VOXELS2. GROUP EMPTY SPACE VOXELS INTO CELLS3. COLLECT OBJECTS IN CELLS4. GENERATE PORTALS BETWEEN CELLS

TOME OF VISIBILITY

RUNTIME

BASIC OPERATION AS IN A TRADITIONAL PORTALS AND CELLS SYSTEM

1.FIND CELL THAT CAMERA IS IN2.TRAVERSE PORTALS-AND-CELLS GRAPH3.GATHER VISIBLE OBJECTS IN CELLS

GENERATES AN OCCLUSION BUFFER FOR DYNAMIC OBJECT TESTING

Umbra 3 in Practice

WHAT IS NEW UNITY 4.3?

• SIMPLIFIED INTERFACE

• INCREMENTAL BAKE

• POINT LIGHT AND SPOT LIGHT CULLING

• SHADOW CASTER CULLING

• MASSIVE RUNTIME PERFORMANCE OPTIMIZATIONS

SMALLEST HOLE

MORE DETAILED INPUT GEOMETRYSLOWER BAKEHIGHER BAKE MEMORY USAGE

LESS DETAILED INPUT GEOMETRYFASTER BAKE

LOWER BAKE MEMORY USAGE

SMALLEST OCCLUDER

LARGER DATASLOWER QUERYLESS CONSERVATIVE

SMALLER DATAFASTER QUERY

MORE CONSERVATIVE

BACKFACE THRESHOLD

SMALLER OCCLUSION DATALESS VISIBLE BACKFACES IN SCENEMORE UNDEFINED AREAS

LARGER OCCLUSION DATAMORE VISIBLE BACKFACES IN SCENE

LESS UNDEFINED AREAS

VISUALIZATIONS

Further Reading

JASIN’S POSTS AT: BLOGS.UNITY3D.COM

SAMPO@UMBRASOFTWARE.COM

UMBRA3.COM

THANKS JOE & UNITY!