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dc.contributor.authorHast, Anders
dc.contributor.authorBarrera, Tony
dc.contributor.authorBengtsson, Ewert
dc.contributor.editorSkala, Václav
dc.date.accessioned2013-09-06T05:20:08Z
dc.date.available2013-09-06T05:20:08Z
dc.date.issued2003
dc.identifier.citationWSCG ’2003: Short papers: The 11-th International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision 2003, 3.-7, p. 57-60.en
dc.identifier.isbn80-903100-1-X
dc.identifier.urihttp://wscg.zcu.cz/wscg2003/Papers_2003/I19.pdf
dc.identifier.urihttp://hdl.handle.net/11025/6164
dc.description.abstractIn the classical shading algorithm according to Phong, the normal is interpolated across the scanline, requiring a computationally expensive normalization in the inner loop. In the simplified and faster method by Gouraud, the intensity is interpolated instead, leading to faster but less accurate shading. In this paper we use a third way of doing the interpolation, namely spherical linear interpolation of the normals across the scanline. This has been explored before, however, the shading computation requires the evaluation of a cosine in the inner loop and this is too expensive to be efficient. By reformulating the original approach in a suitable way, De Moivre’s formula can be used directly for computing the intensity so that no normalization is needed. Hence, no trigonometric functions, divisions or square roots are necessary to compute in the inner loop. Unfortunately the setup for each scanline will be rather slow unless some efficient reformulation of the necessary trigonometric calculations can be found. We suggest this problem for future research.en
dc.format4 s.cs
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherUNION Agencyen
dc.relation.ispartofseriesWSCG ’2003: Short papersen
dc.rights© UNION Agencycs
dc.subjectstínovánícs
dc.subjectnormalizacecs
dc.subjectDe Moivrova formulecs
dc.titleShading vy Spherical lienear interpolation using de moivre's formulaen
dc.typekonferenční příspěvekcs
dc.typeconferenceObjecten
dc.rights.accessopenAccessen
dc.type.versionpublishedVersionen
dc.subject.translatedshadingen
dc.subject.translatednormalizationen
dc.subject.translatedDe Moivres formulaen
dc.type.statusPeer-revieweden
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