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Portal Extraction Based on an Opening Labeling for Ray Tracing

Abstract : Rendering photo-realistic images from a 3D scene description remains a challenging problem when processing complex geometry exposing many occlusions. In that case, simulating light propagation requires hours to produce a correct image. An opening map can be used to extract information from the geometry of the empty space of a scene, where light travels. It describes local thickness and allows to identify narrow regions that are difficult to traverse with ray tracing. We propose a new method to extract portals in order to improve rendering algorithms based on ray tracing. This method is based on the opening map, which is used to define a labeling of the empty space. Then portals-2D surfaces embedded in empty space-are extracted from labeled regions. We demonstrate that those portals can be sampled in order to explore the scene efficiently with ray tracing.
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https://hal.archives-ouvertes.fr/hal-01159795
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Submitted on : Wednesday, June 3, 2015 - 5:16:08 PM
Last modification on : Saturday, January 15, 2022 - 3:57:44 AM
Long-term archiving on: : Tuesday, April 25, 2017 - 12:03:52 AM

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Laurent Noël, Venceslas Biri. Portal Extraction Based on an Opening Labeling for Ray Tracing. 12th International Symposium, ISMM 2015, May 2015, Reykjavik, Iceland. ⟨10.1007/978-3-319-18720-4_3⟩. ⟨hal-01159795⟩

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