{"id":518,"date":"2022-10-30T10:38:07","date_gmt":"2022-10-30T02:38:07","guid":{"rendered":"http:\/\/liyanliang.net\/?p=518"},"modified":"2022-10-30T10:40:06","modified_gmt":"2022-10-30T02:40:06","slug":"ibl_calculate_overall","status":"publish","type":"post","link":"http:\/\/liyanliang.net\/index.php\/2022\/10\/30\/ibl_calculate_overall\/","title":{"rendered":"IBL\u8ba1\u7b97\u603b\u7ed3"},"content":{"rendered":"\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/liyanliangpublic.oss-cn-hongkong.aliyuncs.com\/img\/03.%E4%B8%80%E5%9B%BE%E8%AF%BB%E6%87%82PBR.png\" alt=\"03.\u4e00\u56fe\u8bfb\u61c2PBR\"\/><\/figure>\n\n\n\n<p><a href=\"https:\/\/liyanliangpublic.oss-cn-hongkong.aliyuncs.com\/img\/03.%E4%B8%80%E5%9B%BE%E8%AF%BB%E6%87%82PBR.png\">https:\/\/liyanliangpublic.oss-cn-hongkong.aliyuncs.com\/img\/03.%E4%B8%80%E5%9B%BE%E8%AF%BB%E6%87%82PBR.png<\/a><\/p>\n\n\n\n<p>IBL \u901a\u5e38\u4f7f\u7528\uff08\u53d6\u81ea\u73b0\u5b9e\u4e16\u754c\u6216\u4ece3D\u573a\u666f\u751f\u6210\u7684\uff09\u73af\u5883\u7acb\u65b9\u4f53\u8d34\u56fe (Cubemap) \uff0c\u53ef\u4ee5\u5c06\u7acb\u65b9\u4f53\u8d34\u56fe\u7684\u6bcf\u4e2a\u50cf\u7d20\u89c6\u4e3a\u5149\u6e90\uff0c\u7136\u540e\u5728\u6e32\u67d3\u65b9\u7a0b\u4e2d\u76f4\u63a5\u4f7f\u7528\u5b83\u3002<\/p>\n\n\n\n<p>IBL\u8ba1\u7b97\u4e3b\u8981\u6709\u4e24\u90e8\u5206\u7ec4\u6210\uff0c\u4e00\u4e2a\u662f\u5149\u6e90\u4ea7\u751f\u7684\u989c\u8272\uff0c\u53e6\u4e00\u4e2a\u662f\u73af\u5883\u4ea7\u751f\u7684\u989c\u8272\u3002<\/p>\n\n\n\n<div id=\"toc_container\" class=\"no_bullets\"><p class=\"toc_title\">Contents<\/p><ul class=\"toc_list\"><li><a href=\"#1\"><span class=\"toc_number toc_depth_1\">1<\/span> 1.\u5149\u6e90\u4ea7\u751f\u7684\u989c\u8272<\/a><\/li><li><a href=\"#2\"><span class=\"toc_number toc_depth_1\">2<\/span> 2.\u73af\u5883\u4ea7\u751f\u7684\u989c\u8272<\/a><ul><li><a href=\"#1-2\"><span class=\"toc_number toc_depth_2\">2.1<\/span> (1)\u95f4\u63a5\u6f2b\u53cd\u5c04\u5149<\/a><\/li><li><a href=\"#2-2\"><span class=\"toc_number toc_depth_2\">2.2<\/span> (2)\u95f4\u63a5\u955c\u9762\u5149\u7167<\/a><\/li><\/ul><\/li><li><a href=\"#3IBL\"><span class=\"toc_number toc_depth_1\">3<\/span> 3.\u6700\u7ec8IBL\u7ed3\u679c<\/a><\/li><\/ul><\/div>\n<h2 class=\"wp-block-heading\"><span id=\"1\">1.\u5149\u6e90\u4ea7\u751f\u7684\u989c\u8272<\/span><\/h2>\n\n\n\n<p>\u5149\u6e90\u4ea7\u751f\u7684\u989c\u8272\u8ba1\u7b97\uff0c\u76f4\u63a5\u5c06\u6570\u503c\u5e26\u5165Cook-Torrance\u53cd\u5c04\u7387\u65b9\u7a0b\u5373\u53ef\uff0c<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/liyanliangpublic.oss-cn-hongkong.aliyuncs.com\/img\/image-20221026195350654.png\" alt=\"image-20221026195350654\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/liyanliangpublic.oss-cn-hongkong.aliyuncs.com\/img\/04.%E5%85%89%E6%BA%90%E4%BA%A7%E7%94%9F%E7%9A%84%E9%A2%9C%E8%89%B2Lo.png\" alt=\"04.\u5149\u6e90\u4ea7\u751f\u7684\u989c\u8272Lo\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span id=\"2\">2.\u73af\u5883\u4ea7\u751f\u7684\u989c\u8272<\/span><\/h2>\n\n\n\n<p>\u73af\u5883\u4ea7\u751f\u7684\u989c\u8272\uff0c\u5176\u5b9e\u5c31\u662f\u5929\u7a7a\u76d2\u4ea7\u751f\u7684\u5149\u7167\uff0c\u7531\u95f4\u63a5\u6f2b\u53cd\u5c04\u5149\u548c\u95f4\u63a5\u955c\u9762\u5149\u7ec4\u6210\u3002<\/p>\n\n\n\n<p>\u5c06\u7acb\u65b9\u4f53\u8d34\u56fe\u7684\u6bcf\u4e2a\u7eb9\u7d20\u89c6\u4e3a\u4e00\u4e2a\u5149\u6e90\u3002\u4f7f\u7528\u4e00\u4e2a\u65b9\u5411\u5411\u91cf wi \u5bf9\u6b64\u7acb\u65b9\u4f53\u8d34\u56fe\u8fdb\u884c\u91c7\u6837\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u83b7\u53d6\u8be5\u65b9\u5411\u4e0a\u7684\u5149\u7167\u5f3a\u5ea6\u3002<\/p>\n\n\n\n<p>\u5bf9\u4e8e\u5929\u7a7a\u76d2\u4ea7\u751f\u7684\u73af\u5883\u5149\uff0c\u5e94\u7528\u53cd\u5c04\u7387\u65b9\u7a0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/liyanliangpublic.oss-cn-hongkong.aliyuncs.com\/img\/image-20221027085117052.png\" alt=\"image-20221027085117052\"\/><\/figure>\n\n\n\n<p>\u5c06\u53cd\u5c04\u7387\u65b9\u7a0b\u62c6\u5206\u6210\u6f2b\u53cd\u5c04\u548c\u955c\u9762\u53cd\u5c04\u4e24\u4e2a\u90e8\u5206\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/liyanliangpublic.oss-cn-hongkong.aliyuncs.com\/img\/image-20221027085158924.png\" alt=\"image-20221027085158924\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span id=\"1-2\">(1)\u95f4\u63a5\u6f2b\u53cd\u5c04\u5149<\/span><\/h3>\n\n\n\n<p>\u95f4\u63a5\u6f2b\u53cd\u5c04\u8ba1\u7b97\u516c\u5f0f\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/liyanliangpublic.oss-cn-hongkong.aliyuncs.com\/img\/image-20221027085238634.png\" alt=\"image-20221027085238634\"\/><\/figure>\n\n\n\n<p>\u8ba1\u7b97irradiance\uff0c\u5373<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/liyanliangpublic.oss-cn-hongkong.aliyuncs.com\/img\/image-20221027085448874.png\" alt=\"image-20221027085448874\"\/><\/figure>\n\n\n\n<p>\u7ed9\u5b9a\u6bcf\u4e2a\u7247\u6bb5\u7684\u79ef\u5206\u7403\u5750\u6807\uff0c\u5bf9\u534a\u7403\u8fdb\u884c\u79bb\u6563\u91c7\u6837\u3002<\/p>\n\n\n\n<p>\u5982\u4e0b\u56fe\u6240\u793a\uff0c\u5728\u4e24\u5c42\u5faa\u73af\u5185\uff0c\u83b7\u53d6\u4e00\u4e2a\u7403\u9762\u5750\u6807\u5e76\u5c06\u5b83\u4eec\u8f6c\u6362\u4e3a 3D \u76f4\u89d2\u5750\u6807\u5411\u91cf\uff0c\u5c06\u5411\u91cf\u4ece\u5207\u7ebf\u7a7a\u95f4\u8f6c\u6362\u4e3a\u4e16\u754c\u7a7a\u95f4\uff0c\u5e76\u4f7f\u7528\u6b64\u5411\u91cf\u76f4\u63a5\u91c7\u6837 HDR \u73af\u5883\u8d34\u56fe\u3002\u6211\u4eec\u5c06\u6bcf\u4e2a\u91c7\u6837\u7ed3\u679c\u52a0\u5230 irradiance\uff0c\u6700\u540e\u9664\u4ee5\u91c7\u6837\u7684\u603b\u6570\uff0c\u5f97\u5230\u5e73\u5747\u91c7\u6837\u8f90\u7167\u5ea6\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/liyanliangpublic.oss-cn-hongkong.aliyuncs.com\/img\/06.IBL_irradiance.png\" alt=\"06.IBL_irradiance\"\/><\/figure>\n\n\n\n<p>\u6700\u7ec8\u7531\u95f4\u63a5\u6f2b\u53cd\u5c04\u4ea7\u751f\u7684\u73af\u5883\u5149\u4e3a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">&nbsp;vec3 ambient = kD * diffuse * ao<\/pre>\n\n\n\n<p>\u603b\u7ed3\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/liyanliangpublic.oss-cn-hongkong.aliyuncs.com\/img\/07.IBL_ambient(%E6%BC%AB%E5%8F%8D%E5%B0%84).png\" alt=\"07.IBL_ambient(\u6f2b\u53cd\u5c04)\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span id=\"2-2\">(2)\u95f4\u63a5\u955c\u9762\u5149\u7167<\/span><\/h3>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/liyanliangpublic.oss-cn-hongkong.aliyuncs.com\/img\/08.IBL_%E5%88%86%E5%89%B2%E6%B1%82%E5%92%8C%E8%BF%91%E4%BC%BC%E6%B3%95%EF%BC%88split%20sum%20approximation%EF%BC%89.png\" alt=\"08.IBL_\u5206\u5272\u6c42\u548c\u8fd1\u4f3c\u6cd5\uff08split sum approximation\uff09\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/liyanliangpublic.oss-cn-hongkong.aliyuncs.com\/img\/08.IBL_%E9%97%B4%E6%8E%A5%E9%95%9C%E9%9D%A2%E5%85%89%E7%85%A7(specular).png\" alt=\"08.IBL_\u95f4\u63a5\u955c\u9762\u5149\u7167(specular)\"\/><\/figure>\n\n\n\n<p><a href=\"https:\/\/liyanliangpublic.oss-cn-hongkong.aliyuncs.com\/img\/08.IBL_%E9%97%B4%E6%8E%A5%E9%95%9C%E9%9D%A2%E5%85%89%E7%85%A7(specular).png\">https:\/\/liyanliangpublic.oss-cn-hongkong.aliyuncs.com\/img\/08.IBL_%E9%97%B4%E6%8E%A5%E9%95%9C%E9%9D%A2%E5%85%89%E7%85%A7(specular).png<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span id=\"3IBL\">3.\u6700\u7ec8IBL\u7ed3\u679c<\/span><\/h2>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/liyanliangpublic.oss-cn-hongkong.aliyuncs.com\/img\/09.IBL%E8%AE%A1%E7%AE%97%E6%80%BB%E7%BB%93.png\" alt=\"09.IBL\u8ba1\u7b97\u603b\u7ed3\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>https:\/\/liyanliangpublic.oss-cn-hongkong.aliyuncs.com\/img\/03.%E4%B8%80%E5%9B%BE%E8%AF%BB%E6%87%82PBR.png IBL \u901a\u5e38\u4f7f\u7528\uff08\u53d6\u81ea\u73b0\u5b9e\u4e16\u754c\u6216\u4ece3D\u573a\u666f\u751f\u6210\u7684\uff09\u73af\u5883\u7acb\u65b9\u4f53\u8d34\u56fe (Cubemap) \uff0c\u53ef\u4ee5\u5c06\u7acb\u65b9\u4f53\u8d34\u56fe\u7684\u6bcf\u4e2a\u50cf\u7d20\u89c6\u4e3a\u5149\u6e90\uff0c\u7136\u540e\u5728\u6e32\u67d3\u65b9\u7a0b\u4e2d\u76f4\u63a5\u4f7f\u7528\u5b83\u3002 IBL\u8ba1\u7b97\u4e3b\u8981\u6709\u4e24\u90e8\u5206\u7ec4\u6210\uff0c\u4e00\u4e2a\u662f\u5149\u6e90\u4ea7\u751f\u7684\u989c\u8272\uff0c\u53e6\u4e00\u4e2a\u662f\u73af\u5883\u4ea7\u751f\u7684\u989c\u8272\u3002 Contents1 1.\u5149\u6e90\u4ea7\u751f\u7684\u989c\u82722 2.\u73af\u5883\u4ea7\u751f\u7684\u989c\u82722.1 (1)\u95f4\u63a5\u6f2b\u53cd\u5c04\u51492.2 (2)\u95f4\u63a5\u955c\u9762\u5149\u71673 3.\u6700\u7ec8IBL\u7ed3\u679c 1.\u5149\u6e90\u4ea7\u751f\u7684\u989c\u8272 \u5149\u6e90\u4ea7\u751f\u7684\u989c\u8272\u8ba1\u7b97\uff0c\u76f4\u63a5\u5c06\u6570\u503c\u5e26\u5165Cook-Torrance\u53cd\u5c04\u7387\u65b9\u7a0b\u5373\u53ef\uff0c 2.\u73af\u5883\u4ea7\u751f\u7684\u989c\u8272 \u73af\u5883\u4ea7\u751f\u7684\u989c\u8272\uff0c\u5176\u5b9e\u5c31\u662f\u5929\u7a7a\u76d2\u4ea7\u751f\u7684\u5149\u7167\uff0c\u7531\u95f4\u63a5\u6f2b\u53cd\u5c04\u5149\u548c\u95f4\u63a5\u955c\u9762\u5149\u7ec4\u6210\u3002 \u5c06\u7acb\u65b9\u4f53\u8d34\u56fe\u7684\u6bcf\u4e2a\u7eb9\u7d20\u89c6\u4e3a\u4e00\u4e2a\u5149\u6e90\u3002\u4f7f\u7528\u4e00\u4e2a\u65b9\u5411\u5411\u91cf wi \u5bf9\u6b64\u7acb\u65b9\u4f53\u8d34\u56fe\u8fdb\u884c\u91c7\u6837\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u83b7\u53d6\u8be5\u65b9\u5411\u4e0a\u7684\u5149\u7167\u5f3a\u5ea6\u3002 \u5bf9\u4e8e\u5929\u7a7a\u76d2\u4ea7\u751f\u7684\u73af\u5883\u5149\uff0c\u5e94\u7528\u53cd\u5c04\u7387\u65b9\u7a0b\uff1a \u5c06\u53cd\u5c04\u7387\u65b9\u7a0b\u62c6\u5206\u6210\u6f2b\u53cd\u5c04\u548c\u955c\u9762\u53cd\u5c04\u4e24\u4e2a\u90e8\u5206\uff1a (1)\u95f4\u63a5\u6f2b\u53cd\u5c04\u5149 \u95f4&#8230;<\/p>\n<p class=\"read-more\"><a class=\"btn btn-default\" href=\"http:\/\/liyanliang.net\/index.php\/2022\/10\/30\/ibl_calculate_overall\/\"> Read More<span class=\"screen-reader-text\">  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[62],"class_list":["post-518","post","type-post","status-publish","format-standard","hentry","category-c","tag-pbr"],"_links":{"self":[{"href":"http:\/\/liyanliang.net\/index.php\/wp-json\/wp\/v2\/posts\/518","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/liyanliang.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/liyanliang.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/liyanliang.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/liyanliang.net\/index.php\/wp-json\/wp\/v2\/comments?post=518"}],"version-history":[{"count":1,"href":"http:\/\/liyanliang.net\/index.php\/wp-json\/wp\/v2\/posts\/518\/revisions"}],"predecessor-version":[{"id":519,"href":"http:\/\/liyanliang.net\/index.php\/wp-json\/wp\/v2\/posts\/518\/revisions\/519"}],"wp:attachment":[{"href":"http:\/\/liyanliang.net\/index.php\/wp-json\/wp\/v2\/media?parent=518"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/liyanliang.net\/index.php\/wp-json\/wp\/v2\/categories?post=518"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/liyanliang.net\/index.php\/wp-json\/wp\/v2\/tags?post=518"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}