Study and practice on 3d animation at University level is increasing day by day. But still there is a lack of theoretical books on 3d animation. Though we have enough books on 3d software uses but only a few theoretical research paper can be found on animation. We know animation is related with motion. So the connection between animation and natural science is a must. The rules of physics must be reflected on realistic animation. Students at college or university level should know the explanation of their 3d practical works. This book will help and support the students to acquire theoretical basis of their 3d works. Besides, animators who want to create animation with precise understanding can be benefited from this book.