Imposters for real-time rendering

1999. 7. 20

CG Lab. 박사 3 차류승택

Image Based Representation for Walkthru

실시간 Walkthrough 보이는 물체만을 렌더링 (Visibility Culling) 가까운 거리에서는 실제 Geometry Model 사용 먼거리에 있는 물체에 대해

• LOD 를 적용하거나• Image 로 대치 시킴

Image based Representation Portal Texture Imposter Image cache

관련 연구

Imposter Visual Navigation of Large Environments Using Texture Clus

ters, Paulo, 93• Imposter 개념 소개 ( 전처리 작업에서 미리 만들어 놓음 )

Dynamic Generated Imposter, Gernot Schaufler, 95• Frame Buffer 를 이용하여 동적 환경에 적용

Efficient Imposter Manipulation for Real-Time Visualization of Urban Scenery, Francois Sillion, EG’ 97

• 단일 평면이 아닌 깊이정보를 이용하여 Imposter 재구성 Multi-Layered imposters for accelerated rendering, EG 99

• 다중 레벨의 Imposter 사용

< 실제 물체 > <Imposter>

Imposter

Reference Paper 1: Dynamic Generated Imposter

Dynamic Generated Imposter Imposter 의 생성

• Clearing the frame buffer

• Setting up a view for rendering the object

• Copying the texture into texture memory

• Rendering the imposter to obtain a final image

Frame 간의 Coherence 를 이용

demo

Reference Paper 2: Efficient Imposter Manipulation for Real-Time Visualization of Urban Scenery

<Frustum Culling>

Reference Paper 2:Segmentation

Segmentation of the city model local model distance model Imposter

Reference Paper 2: Local & Distance Model

Reference Paper 2:Imposter

Reference Paper 2:Steps taken to create an imposter

Reference Paper 2: Result

demo

Reference Paper 3: Multi-Layered imposters for accelerated rendeing

Reference Paper 3: Imposter 의 문제점 : Deformation

Reference Paper 3:Imposter 의 문제점 : Resolution mismatch

Reference Paper 3:Imposter 의 문제점 : Incomplete representation

Reference Paper 3:Imposter 의 문제점 : Rubber sheet effect

Reference Paper 3:Imposter 의 문제점 : Cracks

Reference Paper 3: Multi-Layered imposters

Multi-Layered imposters

The environment is divided into a set of viewing cells

Visibility event