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Authors: M. D. Robles-Ortega ; J. R. Jiménez and L. Ortega

Affiliation: University of Jaén, Spain

ISBN: 978-989-758-002-4

Keyword(s): Polar diagrams; large $2.5D$ urban models; hard shadows; ray-shooting

Related Ontology Subjects/Areas/Topics: Animation and Simulation ; Computer Vision, Visualization and Computer Graphics ; Geometry and Modeling ; Interactive Environments ; Lighting and Appearance ; Modeling and Algorithms ; Real-Time Visual Simulation ; Rendering ; Shadows, Translucency and Visibility ; Virtual Tours

Abstract: Illumination and shadows are essential to obtain realistic virtual environments. Nevertheless, large scenes like urban cities demand a huge amount of geometry that must somehow be structured or reduced in order to be manageable. In this paper we propose a novel real-time method to determine the shadowed and illuminated areas in large scenes, specially suitable for urban environments. Our approach uses the polar diagram as a tessellation plane, and a ray-casting process to obtain the visible areas. This solution derives the exact illuminated area with a high performance. Moreover, our approach is also used to determine the visible portion of the scene from a pedestrian viewpoint. As a result, we only have to render the visible part of the scene, which is considerably lower than the global scene.

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Paper citation in several formats:
Robles-Ortega, M.; Jiménez, J. and Ortega, L. (2014). A Novel Ray-shooting Method to Render Night Urban Scenes - A Method based on Polar Diagrams.In Proceedings of the 9th International Conference on Computer Graphics Theory and Applications - Volume 1: GRAPP, (VISIGRAPP 2014) ISBN 978-989-758-002-4, pages 53-63. DOI: 10.5220/0004718800530063

@conference{grapp14,
author={M. D. Robles{-}Ortega. and J. R. Jiménez. and L. Ortega.},
title={A Novel Ray-shooting Method to Render Night Urban Scenes - A Method based on Polar Diagrams},
booktitle={Proceedings of the 9th International Conference on Computer Graphics Theory and Applications - Volume 1: GRAPP, (VISIGRAPP 2014)},
year={2014},
pages={53-63},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0004718800530063},
isbn={978-989-758-002-4},
}

TY - CONF

JO - Proceedings of the 9th International Conference on Computer Graphics Theory and Applications - Volume 1: GRAPP, (VISIGRAPP 2014)
TI - A Novel Ray-shooting Method to Render Night Urban Scenes - A Method based on Polar Diagrams
SN - 978-989-758-002-4
AU - Robles-Ortega, M.
AU - Jiménez, J.
AU - Ortega, L.
PY - 2014
SP - 53
EP - 63
DO - 10.5220/0004718800530063

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