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                            ICCG 93
                            -------

          INTERNATIONAL CONFERENCE ON COMPUTER GRAPHICS:
          ----------------------------------------------
          Interaction, Design, Modeling and Visualisation
          ------------------------------------------------

                          BOMBAY, INDIA
                      February 22 - 26, 1993

                          Organised by

         International Federation for Information Processing 
                  (TC5 -- WG 5.2 and WG 5.10)
          
                               and

                     Computer Society of India



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Welcome to ICCG93
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Computer Graphics is continuously evolving to new levels of creative
accomplishments and technological sophistications with new concepts,
new techniques and an ever increasing spectrum of applications. Modern
computing is largely interactively driven and computational results
are more often communicated visually rather than just in print. The
main goal of ICCG93 is to provide an international forum for the
presentation and discussion of recent developments in the fields of 
Graphics and CAD including case studies in systems and applications,
and state of the art surveys. 

The ICCG93 technical programme is addressing all the current "hot"
topics in the field under the themes of graphical interaction, design,
modelling, rendering and visualisation. This includes five pre-conference
tutorials, keynote addresses and a number of invited talks all being
given by professionals of international eminence coming from different
countries.  

ICCG93 is providing a NOT TO BE MISSED UNIQUE OPPORTUNITY to all
professionals interested in Graphics and its various applications. The
conference includes over thirty presentations reporting the latest
research and developments being carried out worldwide. These will be
presented at the conference by leading experts from 14 different countries
whose papers have been carefully selected by the international programme
committee of ICCG93.

The conference also provides an opportunity for the computer graphics
academia and the industry to come together through the ICCG93 exhibition
and industry seminars. Bombay being the hub of industrial activity in India
provides an excellent setting for this interaction.

We are sure you will agree with us that in India an opportunity such as
this with a technical programme of this high quality does not come our
way very often. The success of ICCG93 depends very much on your joining
us and actively participating in the proceedings of the conference.

We look forward to seeing you and your colleagues in Bombay in February.

Mudur S P                                                Narayanan J P
Chairman, Programme Committee 		Chairman, Organising Committee

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Pre-conference Tutorials
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February 22 and 23, the first two days, are devoted to the tutorial
programme. Tutorials will be given by leading international experts
covering a select but comprehensive range of topics in the areas. 
The tutorials offer an excellent opportunity for professional development
in computer graphics and related areas. All tutorials are planned to
be at an intermediate level, not very introductory nor very advanced,
so as to enable a broad range of people to benefit. Five full day
tutorials have been planned as follows :

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Tutorial Programme, Monday, February 22, 1993              09:30hrs to 17:00hrs
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T1 Computer Animation

Nadia Magnenat Thalmann, University of Geneva, Swiss and Daniel 
Thalmann, University of Laussane, Swiss

This tutorial will first present theoretical & practical aspects 
of computer animation through concepts like image key frame 
animation, parametric key frame animation and algorithmic 
animation. It will emphasise 3D computer animation of articulated 
bodies with a discussion on several important problems to be solved 
related to realistic human characters in computer generated films. 
Research issues in development of techniques applicable to 
specification of tasks using natural language, simulating 
behaviours and improvement of physical aspects such as shapes, 
colours, textures, deformation of limbs during motion and facial 
expressions and deformations will also be discussed.

Methods for designing and animating clothes and hair, which are 
often simulated without autonomous motion in computer generated 
films, will be presented. Through a discussion on individualised 
walking model the tutorial will present an innovative way of 
animating actors at a high level based on the concept of synthetic 
vision. Each synthetic actor uses a synthetic vision, as its 
perception of the world, which serves as the unique input to the 
actor's behavioural model. Finally the tutorial highlights the 
impact of new 3D devices such as Spaceball, Polhemus and Dataglove 
on the design of animation of human body and face.

Nadia Magnenat Thalmann is a professor of Computer Science at the 
University of Geneva, Switzerland and adjunct professor at HEC 
Montreal, Canada. She is the President of the Computer Graphics 
Society and a recipient of the 1985 Communications Award from the 
Govt. of Quebec.

Daniel Thalmann is a professor and head of Computer Science and 
director of the Computer Graphics Lab at the Swiss Federal 
Institute of Technology in Laussane, Switzerland. He is also an 
adjunct professor at the University of Montreal, Canada. He 
co-chairs the EUROGRAPHICS Working Group on Computer Simulation and 
Animation.

Nadia Magnenat Thalmann's and Daniel Thalmann's research interests 
include 3D computer animation, image synthesis and virtual 
reality.

T2 Advances in Geometric Modelling

Chandrajit Bajaj, Purdue University, USA

This tutorial will introduce efficient algorithms and data 
structures for the creation, manipulation and display of geometric 
models of physical objects with curved surfaces. Topics include 
linear systems, decomposition polynomials, basis functions, and 
flex point and multiplicities continuity. The tutorial will 
present various concepts related to curves and surfaces including 
their representation, parametric and implicit forms and conversion 
algorithms. Surface intersection algorithms, decompositions and 
triangular meshes on surfaces, and surface blending and joining 
algorithms will also be discussed.

The tutorial will present solid modelling with a discussion on 
data structures for curved solids, boundary representation, CSG 
and BSP trees, boolean set operations, solid reconstruction 
operations from tomography data and smoothing operations on 
polyhedra.

Chandrajit Bajaj is an associate professor in the Computer Science 
Department of Purdue University, USA. His research interests 
include computational geometry, geometric modelling, computer 
graphics, motion planning and robotics.

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Tutorial Programme, Tuesday, February 23, 1993             09:30hrs to 17:00hrs
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T3 Interactive Data Visualization and Virtual Environments

Georges G. Grinstein, University of Massachusetts at Lowell, Paul 
Breen, MITRE Corporation, and Krishnan Seetharaman, University of 
Massachusetts at Lowell, USA

This tutorial will cover the necessary topics to understand the 
issues involved in interactive data visualisation and virtual 
environments. It provides a history of visualisation and virtual 
reality and looks at the fundamentals of perception in the human 
visual and auditory systems. A discussion on data representations 
and highly interactive virtual exploration spaces and comparison 
of visualisation systems will be presented. The tutorial will use 
many slides and videotapes to illustrate variety of techniques and 
systems that are discussed.

Georges G. Grinstein is a professor of Computer Science at the 
University of Massachusetts, Lowell, director of the Graphics 
Research Laboratory and director of the Institute for 
Visualisation and Perception Research. He is also a principal 
engineer at MITRE Corporation. His areas of research include 
graphics, imaging, sonification, virtual environments, user 
interfaces and interaction, with a strong interest in 
visualisation of complex systems.

Paul Breen heads the Applied Technology Department at MITRE 
Corporation. His department provides a display technology centre 
and a quick reaction prototype group in addition to performing 
equipment evaluation, human factors analysis and performance 
assessment in system acquisitions support. His areas of expertise 
and research interests include performance analysis of 
workstations, computers, peripherals and virtual technologies and 
applications of virtual technologies.

Krishnan Seetharaman is a doctoral candidate in the Department of 
Computer Science at the University of Massachusetts at Lowell. His 
research interests include multi-sensory  interaction, 
visualisation and formal models.

T4 Global Illumination and Image Synthesis

Kadi Bouatouch, University of Rennes 1, France, Sumant Pattanaik, 
National Centre for Software Technology, Bombay, India, and 
Pierre Tellier, IRISA, University of Rennes 1, France.

To attain realism in computer graphics, two main approaches have
been adopted. The first make uses of empirical and ad-hoc
illumination models, while the other uses fundamental physical
laws governing the interaction of light with materials and
participating media, and of the characteristics of the human
visual system, to produce images which are exact representations
of the real world. This tutorial deals with the second approach.
The real aspects of material and effects of global lighting can
be simulated only with physically based reflection and
transmission models, and spectral representation of the emitted,
reflected and refracted light powers. The tutorial discusses why
a trichromatic approximation is not appropriate when the aim is to
produce highly photorealistic images.

The objective of this tutorial is threefold. First, it will show
how a global illumination model can be derived from physics,
optics and photometry. Second, it will provide a collection of
information for a complete understanding of colorimetry, visual
perception and visualisation. And finally it will present
different implementations of global illumination including one
pass, two pass and multi pass methods, form factor calculation,
fresnel factor calculation, choice of wavelengths and Monte Carlo
methods.

Kadi Bouatouch is a professor at the University of Rennes, France
and a researcher at IRISA. He has been active in the field of geometric
modelling and rendering.

Pierre Tellier is a doctoral candidate at IRISA, University of 
Rennes 1, France. He is currently preparing a doctoral thesis in 
the field of realistic image synthesis. His research interests 
include physically based global illumination models in computer 
graphics.

Sumant Pattanaik is a senior scientist at the National Centre
for Software Technology, Bombay, India. He has just completed the
writing of his doctoral thesis in the area of global illumination
and visualisation of complex 3D environments. His research
interests include global illumination and visualisation in
computer graphics.

T5 Object Oriented User Interface Development in X/Motif

S. P. Mudur, T. M. Vijayraman, K. Suresh and Ajay Gupta, National
Centre for Software Technology, Bombay, India

This tutorial will present the synergistic blend of two
technologies, Object Oriented Systems and Windows Systems, in
designing and realising User Interfaces for interactive graphical
applications. It will introduce the necessary concepts and system
details in both these disciplines to enable the participants to
understand and apply them. Specifically, object oriented design
techniques for designing user interfaces will be discussed. The
tutorial will also demonstrate how these designs can be realised
using an Object-oriented language like C++ and a user interface
toolkit like Motif on X Windows.

S. P. Mudur is an associate director at the National Centre for
Software Technology, Bombay, India and heads the Computer Graphics
Division. His research interests include computer aided geometric design,
visualisation and user interfaces.

T. M. Vijayraman is a research scientist at the National Centre
for Software Technology. His area of expertise and research
interests include object oriented data bases and systems, and user
interface development.

K. Suresh and Ajay Gupta are scientists at the National Centre
for Software Technology. Their research interests include user
interfaces and multi-media applications.

Collectively, for the last couple of years, they have been regularly
conducting professional level advanced courses in the topics of X/Motif
and Object Oriented Design.


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Conference Programme
-------------------------------------------------------------------------------

----------------------------
Wednesday, February 24, 1993
----------------------------

1) Inauguration.                                           09:30hrs to 10:30hrs

2) "Graphics and Visualisation"                            10:30hrs to 11:10hrs
   by Prof J.L.Encarnacao, ZGDV, Darmstadt, Germany. (Keynote Address)

------------------------- Tea -------------------------    11:10hrs to 11:30hrs

3) Technical Session on "Modelling & Visualisation"        11:30hrs to 13:00hrs
   a) "Volume Modelling By Orthopedic Surgery"
	by M.S.Kankanhalli, C.P.Yu and R.C.Krueger (Singapore).
   b) "Volume Rendering of Tetrahedral Data"
	by H. Bienenstein, S. Halama, M. Schrotta (Austria)
   c) "Visualisation for Telecommunications Network Planning"
	by John C. Martin (USA)
   d) "Declarative Scenes Modeling with Dynamic Links and
	Decision rules Distributed among the Objects"
	by V Gaildrat, R Caubet, F Rubio (France)

------------------------ Lunch ------------------------    13:00hrs to 13:30hrs

4) Technical Session on "Rendering Techniques"             14:15hrs to 15:45hrs
   a) "Ray Tracing of Particle Systems"
	by Michael Zeiller (Austria)
   b) "Simulated Multiple Scattering for Cloud Rendering"
	by Chris Patmore (UK)
   c) "Hierarchical and Adaptive Meshing with Bilinear Interpolation of
	Vertex Radiosities" by Eric Lafortune (Belgium)
   d) "Faster Image Rendering in Animation Through Motion Compensated
	Interpolation" by Eric Zeghers, Kadi Bouatouch, Eric Maisel
		and Christian Bouville (France)

------------------------- Tea -------------------------    15:45hrs to 16:00hrs

5) Technical Session on "Interaction & Multimedia"          16:0hrs to 17:15hrs
   a) "Developments in Interactive Multimedia"
      by Dr Rae Earnshaw, Univ of Leeds, Leeds, UK. (Invited Lecture)
   b) "ACC - lossless data compression of animation sequences"
	by Eduard Groeller and Walter Stocker (Austria)
   c) "A Conceptual Model for Interaction in Multiple Representational
	Spaces" by K Seetharaman, G Grinstein, H Levkowitz
	and R D Bergeron (USA)

---------------------------
Thursday, February 25, 1993
---------------------------

1) Technical Session on "Geometric Design"                 09:30hrs to 10:30hrs
   a) "Locally Invertible Topological Map for Parametric Blending"
	by Mukund Sanglikar, P.A. Koparkar, V.N. Joshi  (India)
   b) "Multi-dimensional Hermite Interpolation and Approximation for
	Modelling and Visualisation"
	by Chandrajit L. Bajaj (USA)
   c) "Hermite approximation for offset curve computation"
	by Victor Ostromoukhov (Switzerland)

2) "Design and Modelling"                                  10:30hrs to 11:10hrs
   by Prof M.J.Wozny, Rensselaer Design Research Centre, USA. (Keynote Address)

------------------------- Tea -------------------------    11:10hrs to 11:30hrs

3) Technical Session on "Deformable object Design"         11:30hrs to 13:00hrs
   a) "User Interface for Fashion Design"
	By Hans M Werner, Nadia M Thalmann and Daniel Thalmann
		(Switzerland)
   b) "Geometric Modelling of Draped Fabric Surfaces"
	by S G Dhande, P V M Rao, S Tavalloli (India)
	   and C L Moore (USA)
   c) "A Simple Dynamic Model for Animating Cloth Displacement"
	by Li Ling, M. Damodaran, Robert K.L. Gay (Singapore)
   d) "AUTOLAY - An Interactive System for the Design of Composite
	 Laminate Aircraft Components"
	by B G Prakash, T G A Simha, K Sundararaju, D D Ravindranath 
		and K G Shastry (India)

------------------------ Lunch ------------------------    13:00hrs to 13:30hrs

4) Technical Session on "Geometric Algorithms & Techniques"14:15hrs to 15:45hrs
   a) "Graphics, Geometry and Mathematical Morphology"
	by Dr P.K.Ghosh, NCST, Bombay, India. (Invited Lecture)
   b) "An Optimal Algorithm for Computing a Best Cut of a Set of
	Hyperrectangles" by T. Roos, P. Widmayer, and Fabrizio d'Amore (Italy)
   c) "Three Dimensional Line-Clipping by Systematic Enumeration"
	by N C Sharma and S Monohar (India)
   d) "A Two Stage Mapping Technique for Interactive Domain Discretisation"
	by M A Dharap and G R Shevare (India)
   e) "The Slicing Extent Technique for Ray Tracing:
	Isolating Sparse and Dense Areas"
	by Sudhanshu K Semwal (USA) 

------------------------- Tea -------------------------    15:45hrs to 16:00hrs

5) Technical Session on "Simulation & Visualisation"       16:00hrs to 16:45hrs
   a) "Simulation of Facial Skin Using Texture Mapping and Coloration"
	by Prem Kalra and Nadia Magnenat-Thalmann (Switzerland)
   b) "Design and Implementation of a Networked Visual Simulation System"
	by Stanley C F Chan, Samar J Singh (Hongkong)

6) Cultural Programme and Conference Banquet                           19:00hrs

-------------------------
Friday, February 26, 1993
-------------------------

1) Technical Session on "Global Illumination"              09:30hrs to 10:30hrs
   a) "The Mathematical Framework of Adjoint Equations for Illumination
	Computation" by S N Pattanaik (India)
   b) "A Window Projection Radiosity Method for Global Illumination"
	by J. Sun, L. Zou  and R L Grimsdale (UK)

2) "Models for Parallel Computing"                         10:30hrs to 11:10hrs
   by Prof V.Rajaraman, IISc, Bangalore, India. (Keynote Address)

------------------------- Tea -------------------------    11:10hrs to 11:30hrs

3) Technical Session on "Advanced Graphic Techniques"      11:30hrs to 13:00hrs
   a) "The Ray Casting Engine and Ray Representation for Solid Modeling :
	A Research Synopsis" by Jai P. Menon (USA)
   b) "Data Management for Parallel Raytracing of Complex Images"
	by Alan Chalmers, David Stuttard, Derek Paddon (UK)
   c) "A Hierarchical Knowledge and Procedure Based System for Visual
	Simulation and Animation"
	by Didier Bur, Gil Coic, and Jean-Claude Paul (France)

------------------------ Lunch ------------------------    13:00hrs to 13:30hrs

4) Technical Session on "Computer Aided Design"            14:15hrs to 15:45hrs
   a) "Realisability in Computer Aided Design" 
	by Prof S.G.Dhande, IIT Kanpur, India. (Invited Lecture)
   b) "Conceptual Surface Modeling for Industrial Design"
	by Casper G. C. van Dijk (The Netherlands)
   c) "A Method for Deriving a Compact Representation for SSI Trim Curves"
	by S Gopalsamy and T.S.Reddy (India)
   d) "Vinyas : An Interactive Caligraphic Type Design System"
	by Laxmi Parida (India)

------------------------- Tea -------------------------    15:45hrs to 16:00hrs

5) Concluding Session                                      16:00hrs to 17:00hrs

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Industry Seminars
-------------------------------------------------------------------------------

Industry Seminars have been planned during ICCG93 conference on all the
three days. The programme is as follows:

Wednesday, February 24, 1993          13:30hrs to 14:15hrs
                                      17:15hrs to 18:00hrs

Thursday, February 25, 1993           08:45hrs to 09:30hrs
                                      13:30hrs to 14:15hrs
                                      16:45hrs to 17:30hrs

Friday, February 26, 1993             08:45hrs to 09:30hrs
                                      13:30hrs to 14:15hrs

Depending on the number of manufacturers wanting to conduct these seminars
parallel seminars may also be organised.

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ICCG93 Exhibition               February 24 to 26, 1993    9:00hrs to 18:00 hrs
-------------------------------------------------------------------------------

The Computer Graphics exhibition is planned to provide a special forum for
technology suppliers, developers and end users to meet and exchange ideas,
needs and market related information.  Many leading computer graphics
manufacturers, software houses and animation studios are expected to display
and demonstrate state of the art products and techniques.

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ICCG93 Venues
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The pre-conference tutorial programme will be held at The Taj Mahal Hotel.
Facing the Gateway of India, this palatial edifice stands at the Apollo
Bunder overlooking the harbour. The ambience of its Harbour Hall, where the
tutorial sessions will be held, reflects the spirit of adventure and 
discoveries that the ancient seafarers possessed while embarking from here on 
journeys to the unknown land.

Nehru Centre, which is the venue for ICCG93 conference and exhibition, is the
biggest convention hall and exhibition centre in Bombay. Located in Worli,
the heart of this pulsating metropolis, Nehru Centre holds a permanent
exhibition, called The Discovery of India Exhibition, which is a unique
exposition of its kind. The centre's campus also holds Nehru Planetarium and
Nehru Science Centre, the very institutions that encourage one to unravel the
unknown with a scientific temper and zeal.

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ICCG93 Organisation
-------------------------------------------------------------------------------

International Programme Committee

	Chairperson

	S. P. Mudur (India)

	Members

	Michael Cohen (USA)
	Umberto Cugini (Italy)
	S.G. Dhande (India)
	Rae A. Earnshaw (UK)
	J.L. Encarnacao (Germany)
	James D. Foley (USA)
	B.K. Gairola (India)
	Michel Grave (France)
	G.G. Grinstein (USA)
	Ivan Herman (Netherlands)
	Anil K Jain (USA)
	Tosiyasu Kunii (Japan)
	Mantyla (Finland)
	S.P. Mudur (India)
	G. J. Olling (USA)
	L.M. Pattanaik (India)
	S.N. Pattanaik (India)
	S.S.S.P. Rao (India)
	Yogesh N. Shinde (India)
	Francois Sillion (France)
	Nadia Magnenat Thalmann (Switzerland)
	M. Tomljanovich (Italy)
	Gregory J. Ward (USA)
	M. Wozny (USA)

Organising Committee Chairperson

	Chairperson

	J. P. Narayanan, CMC Ltd., Bombay

	Members

	Nirmal Jain, TCS, Bombay
	Farrokh Jijina, CMC Ltd., Bombay
	A. K. Pathak, Kirloskar Pneumatics, Pune
	G. V. Piber, BSSCS, Bombay
	M. M. Raghunath, CMC Ltd., Bombay
	Yogesh N. Shinde, CMC Ltd., Bombay

Conference Secretariat

	ICCG93 Secretariat
	National Centre for Software Development
	Gulmohar Cross Road No. 9
	Juhu, Bombay 400 049, India
	Tel : 91 22 6201606  Fax : 91 22 6210139
	Telex : 11 78260 NCST IN
	e-mail : iccg93@ncst.ernet.in

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ICCG93 Registration Form
-------------------------------------------------------------------------------

	Name :
			(Last)		(First)		(Middle)

	Affiliation :
	Address     :




	Tel:		Fax:			e-mail:	

	Tutorial Participation

	T1 Computer Animation
	T2 Advances in Geometric Modelling
	T3 Interactive Data Visualization and Virtual Environments
	T4 Global Illumination and Image Synthesis
	T5 Object Oriented Programming in X/Motif

	Please select only one on a given day

	Day 1, Monday, Feb, 22   - T1  or  T2
	Day 2, Tuesday, Feb, 23	 - T3  or  T4  or  T5

	Conference Registration (please tick)      YES    or    NO

	Registration Fees

	Per Tutorial	Rs. 1500 (Resident Indians)	$150 (Others)

        Conference	Rs. 2000 (Resident Indians)	$200 (Others)
			Rs. 1000 (students)		$100 (students)

	Fifty percent concession is applicable on conference fees only
        for registered students. Students availing this concession should
	send the necessary proof from the departments/institutions.

	As per Govt. of India regulations Non-resident Indians and
        Foreigners are required to pay the registration fees in US
        dollars only.

	Please tick amount payable

	One Tutorial			Rs. 1500	$150
	Two Tutorials			Rs. 3000	$300

	Conference only			Rs. 2000	$200
	One Tutorial and Conference	Rs. 3500	$350
	Two Tutorials and Conference	Rs. 5000	$500

	Students

	Conference only			Rs. 1000	$100
	One Tutorial and Conference	Rs. 2500	$250
	Two Tutorials and Conference	Rs. 4000	$400


	Payment details (payment by cheques or demand draft only)

	Cheque No.		Drawn On		Dated
	(make cheques and drafts in favour of "CSI-ICCG93")

	Deadlines

	Last date for registration	Monday, February 15, 1993
	Walk-in registrations will be permitted strictly on availability
	of seats. Fees will have to be paid in cash for walk-in
	registrations.

	Mail the completed registration form along with fees to

	ICCG93 Registration
	CMC Ltd.
	The Arcade, World Trade Centre
	Cuffe Parade, Bombay 400 021, India
	Tel : 91 22 2189181  Fax : 91 22 2188149
	Telex : 11 83854

	Registration requests can be sent on the e-mail address of the
	Conference Secretariat. A copy of this request along with the due
	fees must reach the above conference registration office within 15
        days of the posting of the e-mail request but not later than the
	last date of registration i.e Monday, February 15, 1993.
	Accomodation information will be available from the Conference
	Secretariat on request.

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