on going research projects prof hanqiu sun dept of computer science eng cuhk hanqiu@cse cuhk edu hk
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On-going Research Projects Prof. Hanqiu Sun Dept. of Computer Science & Eng., CUHK [email protected] Virtual-hand Interfaces Multi-sensory Surgical Simulation & Training Interactive Fish Behavioral Animation in VR Two-handed Task Planning in Virtual Assembly

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on going research projects prof hanqiu sun dept of computer science eng cuhk hanqiu@cse cuhk edu hk
On-going Research ProjectsProf. Hanqiu SunDept. of Computer Science & Eng., [email protected]
  • Virtual-hand Interfaces
  • Multi-sensory Surgical Simulation & Training
  • Interactive Fish Behavioral Animation in VR
  • Two-handed Task Planning in Virtual Assembly
  • Web-based Virtual Country Parks in HK
  • Haptic Sculpting in Virtual Volume Space
slide2
Virtual-hand Interfaces

The whole-hand input interface has three novel properties:

        • intuitive use of the hand
        • smooth transition of control modes
        • reduced interface complexity

Hand interface is formed by both postures and gestures. It is difficult to recognize both due to:

        • the complexity of hand structure
        • the lack of accurate measure

Hand itself is an articulated structure with multiple degrees of freedom (DOFs)

(17 active joints --> 23 degrees + 6 degrees)

physics based virtual hand grasping
Physics-based virtual-hand grasping
  • three states : free, upward, dropping
    • free : no collision is detected
    • upward : collision is detected, object is held firmly
    • dropping : collision is detected, object is slipping from the hand
  • two stages : Visual Correction and Active Grasping
virtual tools in multi sensory interaction
Virtual tools in multi-sensory interaction
  • Display two models simultaneously for comparison
  • Two–handed

comparison

virtual tools in multi sensory interaction22
Virtual tools in multi-sensory interaction
  • Display modes:
    • Full Volume
    • Monoplanar
    • Triplanar
virtual tools in multi sensory interaction23
Virtual tools in multi-sensory interaction
  • Fork tool
    • to position and orientate any object
  • Clip tool
    • reveal cross-sections
  • Crop tool
    • show sub volume
slide26
Interactive Fish Behavioral Animation in VR

Behavioral Animation

      • random movement
        • collision between fishes
        • collision between fish and the env.
        • random swimming
      • behavior of crowds
        • speed match
        • school movement
      • behavior patterns (chaos models)
        • food searching behavior
        • fish preying behavior
        • danger escaping behavior
slide27

Fish Model Creation

    • use of fish skeleton

Relation between control points and surface points

behavior of crowds
Behavior of Crowds
  • Schooling behavior
fish preying behavior
Fish Preying Behavior
  • similar as food searching behavior
  • shark attacking the fish
slide37
Two-handed Task Planning in Virtual Assembly

Assembly modeling is the process of capturing entities and activity information related to assembling and assembly.

Our task planner incorporates with a VR interface for 3D immersive interaction of CAD models and high-level task planning of mating processes.

      • 3D immersive VR interface
      • Assembly analysis
      • Feature/constraint update
      • Assembly task planning

(collision-free interaction, allowable motion)

slide48
Geographic Information Systems

GIS is a System ofcomputer software, hardware and data, and personnel to help manipulate, analyze and present information that is tied to a spatial location

    • spatial location– a geographic location
    • information– visualization of data analysis
    • system– linking software, hardware, data
    • personnel– explorers key to the power of GIS
web based virtual country parks
Web-based Virtual Country Parks
  • Provide on-line visualization of multi-scale, multi-dimension, and multi-source data of HK country parks
  • Promote the ecological tourism and public recreation in our nature, improve the parks with the collection of public suggestions
  • Interactive network for citizens to know more about our country parks, communication with voice or text, even play in the parks
system architecture
System Architecture
  • 3-tier architecture system with Internet-enabled environment and database system support
slide54

Objectives –VBVR System

  • VBVR System - Volume-Based Virtual Reality System
  • Real Time Volume Sculpting
system architecture55
System Architecture
  • Platform
    • SGI IRIX
  • Hardware
    • PHANToM
  • Software
    • GHOST SDK
    • C++
    • OpenGL
slide59

Virtual Tools in VBVR System

  • Melting Manipulation

Volume::display()

Check collision

Display::collideDetect()

If collide

Get the last Phantom position and the current position

Load the texture volume again

Set the pixel value to 0

Convert the coordinates from World Coordinates to Volume Coordinates

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