{"id":40284,"date":"2020-01-06T14:13:02","date_gmt":"2020-01-06T14:13:02","guid":{"rendered":"http:\/\/www.labri.fr\/perso\/barla\/blog\/?p=40284"},"modified":"2020-01-06T14:13:19","modified_gmt":"2020-01-06T14:13:19","slug":"shadows","status":"publish","type":"post","link":"https:\/\/www.labri.fr\/perso\/barla\/blog\/?p=40284","title":{"rendered":"Shadows"},"content":{"rendered":"<p id=\"top\" \/>\n<h3 class=\"wp-block-heading\">Disentangling shadows<\/h3>\n\n\n\n<p>Shadows differ from mere surface markings in that they to not stop at  object boundaries. They are also deformed by projection, but the extent of this deformation might be subtle&#8230; If true this would mean that a shadow could be made to look like a  marking by clipping at part boundaries&#8230; <\/p>\n\n\n\n<p>Other cues might run in conflict, such as variations in edge fuziness  due to distance from occluder\/light. Attached shadows may be another cue for shadowness, one that requires a  notion of layout. <\/p>\n\n\n\n<p>How do shadows compare to transparency perception? Because they do share  a lot&#8230; Of course, when set in motion, shadows stand out; but also when lighting  changes, how is that so? <\/p>\n\n\n\n<p>Even if all cues are cautiously removed, a shadow might not appear as a  marking because it is simply too dark or lacks the proper type of edges. <br>These expectations might vary depending on the underlying surface, for  example between a wet patch of soil and a painted car body. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Specular shadows<\/h3>\n\n\n\n<p>Shadows are usually considered static as long as illumination is fixed. But this is only true of shadows on diffuse objects. <\/p>\n\n\n\n<p>When an object is (even slightly) glossy and sufficiently rough, shadows may be seen as reflections of dark objects in the scene; hence they move with the view!<\/p>\n\n\n\n<p>Since both diffuse and specular shadows are nearly featureless, there are good chances that they are visually &#8220;merged&#8221;; another instance of diffuse\/specular separation failure.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Disentangling shadows Shadows differ from mere surface markings in that they to not stop at object boundaries. They are also deformed by projection, but the extent of this deformation might be subtle&#8230; If true this would mean that a shadow could be made to look like a marking by clipping at part boundaries&#8230; Other cues &#8230; <a title=\"Shadows\" class=\"read-more\" href=\"https:\/\/www.labri.fr\/perso\/barla\/blog\/?p=40284\" aria-label=\"Read more about Shadows\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[772],"tags":[],"class_list":["post-40284","post","type-post","status-publish","format-standard","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=\/wp\/v2\/posts\/40284","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=40284"}],"version-history":[{"count":1,"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=\/wp\/v2\/posts\/40284\/revisions"}],"predecessor-version":[{"id":40285,"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=\/wp\/v2\/posts\/40284\/revisions\/40285"}],"wp:attachment":[{"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=40284"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=40284"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.labri.fr\/perso\/barla\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=40284"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}