Internetbased Interactive Virtual Environment Rendering System

1
Internet-based Interactive Virtual Environment
Rendering System

• An sample implementation

2
Features

• Progressive meshes
• Image-based rendering using impostors
• Efficient scene partition
• Modular implementation
• Rendering time control
• Web integration

3
Progressive meshes

• A geometry data format for progressive
  transmission
• Base mesh
• Progressive refinement
• Present objects of various level-of-detail (LOD)

4
(No Transcript)
5
Image-based rendering using impostors

• Replace far geometry model with images
• 2D images - constant rendering time
• Precomputed images
• Negligible distortion factor

6
(No Transcript)
7
Scene partition

• Hexagonal cells
• Geometry clusters
• Selective transmission - efficient

8
Modular implementation

• Modular - abstract interface - rendering engine
  can be implemented by any graphics library
• Dividing render commands into small codes -
  suitable for transmission

9
Scene Buffer
RI Response Interpreter
N e t w o r k I n t e r f a c e
Startup
User input
CU Control Unit
r-CC r-Code Compiler
Blob Receiver
Render Engine
r-CI r-Code Interpreter
RI module helper
decompress
Refiner
Main Loader
Render Target
client
10
. .
N e t w o r k I n t e r f a c e
SL Scene Loader (parser)
PM Loader
Dispatcher
C/PU Command Processing Unit
Interactive
Scene Object Files
Scene Buffer
iSE Intelligent Scene Engine
Blob
server
11
Rendering time control

• Sustain a almost-constant frame rate even when
  the scene is complex
• Benefit-cost evaluation algorithm

12
Web integration

• Click on object to browse related information
• Campus or factory guide system