This book gathers peer-reviewed papers presented at the 22nd International Conference on Geometry and Graphics (ICGG 2026), held in Zagreb, Croatia, on August 3–7, 2026. The conference is promoted by the International Society for Geometry and Graphics (ISGG) and serves as an international forum for the presentation and discussion of research in geometry and graphics and related disciplines.

The proceedings of ICGG 2026 are published in three volumes covering the conference topics: Theoretical Graphics and Geometry, Applied Geometry and Graphics, Engineering Computer Graphics, Graphics Education, and Geometry and Graphics in History.

Volume 1 contains contributions in Theoretical Graphics and Geometry, Engineering Computer Graphics, and Geometry and Graphics in History. The papers included in this book present recent developments in geometric theory, computational and engineering applications of graphics, and historical studies related to geometry and graphical representation. This book is of interest to researchers, educators, engineers, architects, and professionals working in geometry, graphics, computer-aided design, and related fields.