Variable penumbra soft shadows for mobile devices

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• dc.contributor.author Evans, Alun Thomas
• dc.contributor.author Agenjo, Javier
• dc.contributor.author Blat, Josep
• dc.date.accessioned 2024-03-15T12:22:42Z
• dc.date.available 2024-03-15T12:22:42Z
• dc.date.issued 2014
• dc.description Comunicació presentada a la 9th International Conference on Computer Graphics Theory and Applications (VISIGRAPP 2014), celebrada del 5 al 8 de gener de 2014 a Lisboa, Portugal.
• dc.description.abstract In many applications of 3D graphics, shadows increase the believability and perceived quality of a scene. With the increase in power of workstation hardware, high-quality soft shadowing has become relatively common in many 3D desktop applications. In parallel, recent years have seen an increase in the availability and use of mobile and tablet based devices. The popularity of such devices is driving an increase in graphics intensive applications targeting the hardware, many of which will naturally require the use of shadowing algorithms. Yet the different architecture of graphics hardware of mobile devices restricts the implementation of many graphics algorithms, particularly those that require multiple references to a texture, such as common shadowing techniques. In this paper, we discuss effective shadowing on mobile devices. We show that even small-kernel Percentage Closer Filtering (PCF) soft shadows provide unacceptable framerates on mobile GPUs, but also how mip-chain dilation o f the edges of a shadow map allows improvement performance to acceptable levels. Finally, we extend this technique by quantizing the strength of the detected edge to implement variable penumbra shadowing based on occluder distance.
• dc.description.sponsorship This work was funded by the IMPART FP7 project http://impart.upf.edu/.
• dc.format.mimetype application/pdf
• dc.identifier.citation Evans A, Agenjo J, Blat J. Variable penumbra soft shadows for mobile devices. In: Coquillart S, Pettré J, Braz J, editors. Proceedings of the 9th International Conference on Computer Graphics Theory and Applications (VISIGRAPP 2014) (Volume 1: GRAPP); 2014 Jan 5-8; Lisbon, Portugal. [place unknown]: SciTePress; 2014. p. 181-8. DOI: 10.5220/0004666901810188
• dc.identifier.doi http://dx.doi.org/10.5220/0004666901810188
• dc.identifier.isbn 9789897580024
• dc.identifier.issn 2184-4321
• dc.identifier.uri http://hdl.handle.net/10230/59434
• dc.language.iso eng
• dc.publisher SCITEPRESS – Science and Technology Publications
• dc.relation.ispartof Coquillart S, Pettré J, Braz J, editors. Proceedings of the 9th International Conference on Computer Graphics Theory and Applications (VISIGRAPP 2014) (Volume 1: GRAPP); 2014 Jan 5-8; Lisbon, Portugal. [place unknown]: SciTePress; 2014. p. 181-8
• dc.relation.projectID info:eu-repo/grantAgreement/EC/FP7/ 316564
• dc.rights © 2023 SciTePress, Science and Technology Publications, Lda - All rights reserved. CC BY-NC-ND 4.0
• dc.rights.accessRights info:eu-repo/semantics/openAccess
• dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/4.0/
• dc.subject.keyword Shadow
• dc.subject.keyword Soft shadow
• dc.subject.keyword Mobile
• dc.subject.keyword Tablet
• dc.subject.keyword Variable penumbra
• dc.title Variable penumbra soft shadows for mobile devices
• dc.type info:eu-repo/semantics/conferenceObject
• dc.type.version info:eu-repo/semantics/publishedVersion