This book constitutes the refereed proceedings of the 39th International Conference on Computer Animation, Social Agents, and Extended Reality, CASAXR 2026, held in Geneva, Switzerland, during June 1–3, 2026.

The 24 full papers presented in this book were carefully selected and reviewed from 84 submissions. These papers have been organized in the following topical sections: 

Computer animation and motion technologies

Socially intelligent virtual humans and agents

Virtual, Augmented, and Mixed Reality systems

Immersive interaction and storytelling

Artificial Intelligence for animation and XR environments

Diffusion models for motion synthesis

Large Language Models (LLMs) for XR and animation

Generative AI for animation and virtual worlds

Applications, user studies, and evaluation methods