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Open AccessArticle

Real Time Shadow Mapping for Augmented Reality Photorealistic Rendering

Department of Industrial Engineering—DIN, University of Bologna, Viale del Risorgimento 2, 40100 Bologna, BO, Italy
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Appl. Sci. 2019, 9(11), 2225;
Received: 25 March 2019 / Revised: 29 April 2019 / Accepted: 18 May 2019 / Published: 30 May 2019
(This article belongs to the Special Issue Human-Computer Interaction and 3D Face Analysis)


In this paper, we present a solution for the photorealistic ambient light render of holograms into dynamic real scenes, in augmented reality applications. Based on Microsoft HoloLens, we achieved this result with an Image Base Lighting (IBL) approach. The real-time image capturing that has been designed is able to automatically locate and position directional lights providing the right illumination to the holograms. We also implemented a negative “shadow drawing” shader that contributes to the final photorealistic and immersive effect of holograms in real life. The main focus of this research was to achieve a superior photorealism through the combination of real-time lights placement and negative “shadow drawing” shader. The solution was evaluated in various Augmented Reality case studies, from classical ones (using Vuforia Toolkit) to innovative applications (using HoloLens). View Full-Text
Keywords: augmented reality; holographic shadow; image processing; light mapping; rendering techniques augmented reality; holographic shadow; image processing; light mapping; rendering techniques

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Osti, F.; Santi, G.M.; Caligiana, G. Real Time Shadow Mapping for Augmented Reality Photorealistic Rendering. Appl. Sci. 2019, 9, 2225.

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