The book has been developed from the notes and discussions held in lectures and tutorial classes taken for the Computer Graphics course at different levels. We acknowledge the many helpful comments received from students in various Computer Graphics and CAD courses and seminars. We express our appreciation to the organizations and individuals who furnished photographs and other materials used in the book.

The fi rst author has introduced the full course of Computer Graphics and part of the course in CAD at the undergraduate and postgraduate levels at ISM Dhanbad, Punjab Engineering College, Chandigarh, and BIT Mesra, Ranchi, where he has introduced and taught the course during the last 15 years. He is indebted to his colleagues at these institutions who provided inspiration and guidance during the early development of the book. He would especially like to thank his teacher Dr. K. Athre of IIT, Delhi, for his valuable suggestions during the preparation of this book, particularly on topics related to space curve and surface. We would like to thank Dr. Y. Nath of IIT, Delhi, Dr. R. K. Srivastava and Dr. A. D. Bhatt of MNNIT, Allahabad, Dr. Anil Kumar Aggarwal of BHU (IT), Dr. Arun Lal of Punjab Engineering College, Chandigarh, Prof. Nageshwar Rao, Osmania University, Hyderabad, for their discussion and encouragement. We are indebted to all those who provided reviews or suggestions for the material covered in this book. We would like to thank Prof. M. K. Chakraborty (HOD Narula Institute of Technology, Kolkata), Mr. P. Sheikh Abdul Khader (Prof. and Head, Crescent Engineering College, Vandalur, Chennai), Mr. M. Prasanna (Lecturer, PSG College of Technology, Peelamedu, Coimbatore), Mr. B.S. Umashankar (Prof. and Head, Dr. Ambedkar Institute of Technology, Mallathahalli, Bangalore), Ms. Archana Athawale (Assistant Prof. Thadomal Shahani College of Engineering, Bandra, Mumbai) for their reviews.

We are grateful to the management of BIT, Mesra, Ranchi, which provided a conductive and congenial environment for writing this book. Our special respects to Dr. H.C. Pandey, Vice Chancellor emeritus, and Dr. S.K. Mukherjee, Vice Chancellor of BIT, Mesra, Ranchi, whose everlasting encouragement for academic work made this book possible.

We offer our thanks to Vibha Mahajan, Shalini Jha and Suneeta Singh Bohra of Tata McGraw Hill India for their support.

Last but not the least, thanks are due to our family members for their patience and support while the writing of this book was in progress.

Amarendra Nath Sinha
Arun Dayal Udai