{"id":116,"date":"2009-03-20T01:23:06","date_gmt":"2009-03-20T08:23:06","guid":{"rendered":"http:\/\/www.kevinbeason.com\/worklog\/?p=116"},"modified":"2009-03-20T01:23:06","modified_gmt":"2009-03-20T08:23:06","slug":"glossy-reflections","status":"publish","type":"post","link":"https:\/\/www.kevinbeason.com\/worklog\/2009\/03\/20\/glossy-reflections\/","title":{"rendered":"Glossy reflections"},"content":{"rendered":"\n\t\t<style type=\"text\/css\">\n\t\t\t#gallery-1 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 33%;\n\t\t\t}\n\t\t\t#gallery-1 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-1' class='gallery galleryid-116 gallery-columns-3 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/www.kevinbeason.com\/worklog\/wp-content\/uploads\/2009\/03\/brdftestdusk.png'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.kevinbeason.com\/worklog\/wp-content\/uploads\/2009\/03\/brdftestdusk-150x150.png\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/www.kevinbeason.com\/worklog\/wp-content\/uploads\/2009\/03\/brdftestuffizi.png'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.kevinbeason.com\/worklog\/wp-content\/uploads\/2009\/03\/brdftestuffizi-150x150.png\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl>\n\t\t\t<br style='clear: both' \/>\n\t\t<\/div>\n\n<p>Added Ashikhmin &amp; Shirley&#8217;s Anisotropic Phong BRDF and Schlick&#8217;s BRDF (the &#8217;94 paper) support for pure path tracing (implicit light paths only). My Schlick BRDF is probably broken. Adding these entailed abstracting a BRDF interface class, implementing importance sampling and computing BRDF\/PDF. The daylight image is after sunset for a good reason. The sun would only contribute if a ray found it by chance&#8230; talk about noise.<\/p>\n<p>Front row is Ashikhmin &amp; Shirley Anisotropic Phong BRDF. 2nd row is Schlick&#8217;s anisotropic BRDF. Third row is my preexisting set of materials. Back row is A&amp;S BRDF with measured reflectance values (in RGB. See previous post.) The floor is A&amp;S BRDF and my fascimile of their texture.<\/p>\n<p>Left image is Preetham daylight model. Right is Debevec&#8217;s Uffizi HDR environment probe.<\/p>\n<p>2048 spp, 24-30 minutes each on a Q6600 2.4GHz Core 2 Quad.<\/p>\n<p>This work is from May 2008.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Added Ashikhmin &amp; Shirley&#8217;s Anisotropic Phong BRDF and Schlick&#8217;s BRDF (the &#8217;94 paper) support for pure path tracing (implicit light paths only). My Schlick BRDF is probably broken. Adding these entailed abstracting a BRDF interface class, implementing importance sampling and computing BRDF\/PDF. The daylight image is after sunset for a good reason. The sun would [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-116","post","type-post","status-publish","format-standard","hentry","category-general"],"_links":{"self":[{"href":"https:\/\/www.kevinbeason.com\/worklog\/wp-json\/wp\/v2\/posts\/116","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.kevinbeason.com\/worklog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.kevinbeason.com\/worklog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.kevinbeason.com\/worklog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.kevinbeason.com\/worklog\/wp-json\/wp\/v2\/comments?post=116"}],"version-history":[{"count":10,"href":"https:\/\/www.kevinbeason.com\/worklog\/wp-json\/wp\/v2\/posts\/116\/revisions"}],"predecessor-version":[{"id":128,"href":"https:\/\/www.kevinbeason.com\/worklog\/wp-json\/wp\/v2\/posts\/116\/revisions\/128"}],"wp:attachment":[{"href":"https:\/\/www.kevinbeason.com\/worklog\/wp-json\/wp\/v2\/media?parent=116"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.kevinbeason.com\/worklog\/wp-json\/wp\/v2\/categories?post=116"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.kevinbeason.com\/worklog\/wp-json\/wp\/v2\/tags?post=116"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}