Computer Supported Collaborative Visualization C S C V Sun-In Lin

 Traditional Scientific-Visualization software can only help one man visualize some data on his desktop. Scientific Visualization

 Collaboratively Visualizing data set on a desktop at different LOCATIONS, even at different TIME -- CSV. Collaborative Scientific Visualization

 WCV: Collaborative visualization system using web-styled user interface.  WCV extended from Computer Supported Co- operative Work (CSCW). Web-Based Collaborative Visualization

 Developing a collaborative visualization system enabling to support both “synchronous” and “asynchronous” operations. ※ System Design Goal (1) ※

 Shared-Screen ： Remote Display (X-Window)  Shared-Image: Sending Rendered Images (centralized Approach)  Shared-Control: Sending Control Parameters (Distributed Approach)  Sharing viewpoint 、 camera 、 visualization attributions 、 collaboration contents, etc. ※ System Design Goal (2) ※

 Requiring a cross-platform system supporting various operating systems for several hardware platforms. ※ System Design Goal (3) ※

 Member Service: Member Server and Member Client.  CV Service: CV Server and CV Client.  Advantages: two services are with independency.  Adopting Visualization Toolkits (VTK) ※ System Architecture (1) ※

 Dual servers with three execution modes. ※ System Architecture (2) ※

 Double View-Windows: Global and Local View. ※ System Architecture (3) ※

 Member Server Side. ※ System Architecture (4): Member Server ※

 Member Client Side. ※ System Architecture (5): Member Client ※

 CV Server Side. ※ System Architecture (6) ※

 CV Client Side. ※ System Architecture (7) ※

 Security Issues. ※ System Architecture (8) ※

 Qualification Table Maintenance. ※ System Architecture (9) ※

 Global Execution Architecture: an overview. ※ System Architecture (10) ※

 Global execution procedure: an overview.

※ Development Components ※

※ Implementing NPR Function (1) ※

 Critical techniques ※ NPR Functions (2) ※

※ Model Editing ※

※ Converting Scripts to C Source ※

 1. Network Transmission Speed  2. Numbers of Collaborative Member  3. Collaborative Model Complexity  4. Hard Disk Access Speed in the CV Server  5. Processing Speed in the CV Client  6. Collaborative Operations

Test Scene

Test Environment

Network Traffic

Timing for 200 Operations in Seconds

※ Bottleneck of Real Time Collaboration ※  Network Transmission Speed  Collaboration is proceeded by sending the control parameters with small amounts of data, being independent on the network transmission speed.  Hardware in the Client Side  Complex models require high-performance hardware in the client side to reach real time collaboration.  System Bottleneck  System bottleneck is at the speed of hardware capability in the client side, not depending on network transmission speed.

An Example for NPR Rendering

 Collaborative Model-Editing.  More NPR Rendering.  Further Performance Analysis.  Security Improvement.  System Maintenance. ※ Future Work (1) ※

※ Future Work (2) ※

T D C S V S Thanks! Q & A