We would like to acknowledge the amazing staff and editorial team at Packt Publishing: without their talent and dedication, this book would not have turned out to be such a valuable asset. First, we would like to thank Ashitosh Gupta for contacting us and giving us the opportunity of writing about a subject, Augmented Reality, that we love. We also want to thank our editors Aamir Ahmed, Jane D'souza, and Hayden Edwards for their many insightful comments and guiding us through the process of writing. Thanks for your efforts and helpfulness. 

A special mention goes to our good friend Aitor Sansebastián for encouraging us to carry out this project out. We would also like to thank all those who've supporting us in this journey since we founded our company, the ones who have been there from the beginning, and those who joined us along the way. You know who you are :)  

"I would especially like to thank the two women who have accompanied me along the process of this book. First, to Enara Artetxe, the co-author of this book and a professional colleague, who I consider the best "ninja developer" in augmented reality. Without her, this book could not have been possible. And second, to my better half Ana Laín, for her daily support in every aspect of my life and for helping me to overcome any challenges I encountered." - Jorge R. López Benito

"A special thanks goes to my cat Keiko; without her constant jumping on my keyboard, threatening to write the book herself, or the endless hours of sitting in my lap, leaving me without anything to do but coding and writing, the process of writing this book wouldn't have been the same :)" - Enara Artetxe González

Last but not least, a big THANK YOU to you all, our readers, for investing your time in reading our book. We hope you have learned and enjoyed as much as we have.