{"id":4740,"date":"2022-03-07T22:42:00","date_gmt":"2022-03-07T14:42:00","guid":{"rendered":"https:\/\/www.yumefx.com\/?p=4740"},"modified":"2022-03-09T15:51:24","modified_gmt":"2022-03-09T07:51:24","slug":"%e5%9f%ba%e4%ba%8e%e7%89%a9%e7%90%86%e6%b8%b2%e6%9f%93%e7%9a%84%e5%9f%ba%e7%a1%80%e7%9f%a5%e8%af%86","status":"publish","type":"post","link":"https:\/\/www.yumefx.com\/?p=4740","title":{"rendered":"\u57fa\u4e8e\u7269\u7406\u6e32\u67d3\u7684\u57fa\u7840\u77e5\u8bc6"},"content":{"rendered":"\n<h1 style=\"text-align: center;\">\u524d\u8a00<\/h1>\n<p>\u524d\u9762\u4e24\u7bc7\u6587\u7ae0\u4ecb\u7ecd\u4e86whited-style\u5149\u7ebf\u8ffd\u8e2a\u6a21\u578b\uff0c\u867d\u7136\u53ef\u4ee5\u5f97\u5230\u4e0d\u9519\u7684\u5149\u7167\u6548\u679c\uff0c\u4f46\u663e\u7136\u5b83\u4f9d\u7136\u4e0d\u662f\u7269\u7406\u51c6\u786e\u7684\u6a21\u578b\uff0c\u539f\u56e0\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li><strong>\u5149\u7ebf\u4eae\u5ea6\u53ea\u662f\u7b80\u5355\u7684\u6570\u503c\uff0c\u6ca1\u6709\u7269\u7406\u610f\u4e49\u4e0a\u7684\u5355\u4f4d\uff0c\u800c\u73b0\u5b9e\u4e2d\u5149\u7ebf\u7684\u4eae\u5ea6\u662f\u7528\u7279\u5b9a\u7684\u4eae\u5ea6\u5355\u4f4d\u8868\u793a\u7684\u3002<\/strong><\/li>\n<li><b>\u5728\u8ba1\u7b97\u7740\u8272\u65f6\uff0c\u4f7f\u7528\u4e86Blinn-Phong\u6a21\u578b\uff0c\u800cBlinn-Phong\u6a21\u578b\u672c\u8eab\u5c31\u662f\u4e00\u4e2a\u4e0d\u51c6\u786e\u7684\u7ecf\u9a8c\u6a21\u578b\uff0c\u4f7f\u7528\u8fd9\u79cd\u6a21\u578b\u7684whited-style\u5149\u7ebf\u8ffd\u8e2a\u5f53\u7136\u4e5f\u662f\u4e0d\u6b63\u786e\u7684<\/b><\/li>\n<li><b>whited-style\u5149\u7ebf\u8ffd\u8e2a\u5bf9\u4e8e\u6f2b\u53cd\u5c04\u8868\u9762\u76f4\u63a5\u8fdb\u884c\u5149\u7167\u8ba1\u7b97\uff0c\u5e76\u6ca1\u6709\u5bf9\u6f2b\u53cd\u5c04\u7684\u5149\u7ebf\u8fdb\u884c\u8ffd\u8e2a\u3002<\/b><\/li>\n<li><b>whited-style\u5149\u7ebf\u8ffd\u8e2a\u5bf9\u4e8e\u53cd\u5c04\u8868\u9762\u8fdb\u884c\u955c\u9762\u53cd\u5c04\uff0c\u96be\u4ee5\u6a21\u62df\u4ecb\u4e8e\u6f2b\u53cd\u5c04\u548c\u955c\u9762\u53cd\u5c04\u4e4b\u95f4\u7684\u5149\u6cfd\u53cd\u5c04(Glossy 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Rendering\uff08\u7b80\u79f0PBR\uff0c\u57fa\u4e8e\u7269\u7406\u7684\u6e32\u67d3\uff09<\/strong>\u5c31\u53ef\u4ee5\u5b8c\u7f8e\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\uff0c\u672c\u6587\u5c31\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0b\u8f90\u5c04\u5ea6\u91cf\u5b66\u3001BRDF\u4ee5\u53ca\u6e32\u67d3\u65b9\u7a0b\u7684\u57fa\u7840\u6982\u5ff5\u3002<\/p>\n<h1>\u00a0<\/h1>\n<h1 style=\"text-align: center;\">\u8f90\u5c04\u5ea6\u91cf\u5b66<\/h1>\n<p data-pid=\"Mm0m95jx\">\u8f90\u5c04\u5ea6\u91cf\u5b66\u5176\u5b9e\u662f\u5bf9\u5149\u7167\u7684\u4e00\u5957\u6d4b\u91cf\u7cfb\u7edf\u548c\u5355\u4f4d\uff0c\u5b83\u80fd\u591f\u51c6\u786e\u7684\u63cf\u8ff0\u5149\u7ebf\u7684\u7269\u7406\u6027\u8d28\u3002<\/p>\n<p data-pid=\"lg-dQBh_\">\u5176\u4e2d\uff0c\u9700\u8981\u660e\u767d\u51e0\u4e2a\u5173\u4e8e\u5149\u7ebf\u7684\u6982\u5ff5\uff0c\u5206\u522b\u4e3a\uff1a <b>\u8f90\u5c04\u80fd\u91cf(Radiant Energy)\uff0c\u8f90\u5c04\u901a\u91cf(Radiant Flux)\uff0c\u8f90\u5c04\u5f3a\u5ea6(Radiant Intensity)\uff0cIrradiance\uff0cRadiance<\/b>\uff0c\u63a5\u4e0b\u6765\u5c31\u5bf9\u8fd9\u4e9b\u6982\u5ff5\u8fdb\u884c\u5177\u4f53\u89e3\u91ca\u3002<\/p>\n<h3>\u00a0<\/h3>\n<h3><b>\u8f90\u5c04\u80fd\u91cf(Radiant Energy)<\/b><\/h3>\n<p>\u8f90\u5c04\u80fd\u91cf\u6307\u7684\u662f\u8f90\u5c04\u51fa\u6765\u7684\u7535\u78c1\u80fd\u91cf\uff0c\u8bb0\u4e3aQ\uff0c\u5355\u4f4d\u4e3aJ\uff08\u7126\u8033\uff09\u3002\u53ef\u4ee5\u7528\u7269\u7406\u5f53\u4e2d\u7684\u505a\u529f\u7684\u5927\u5c0f\u6765\u8fdb\u884c\u7c7b\u6bd4\u3002<\/p>\n<h3>\u00a0<\/h3>\n<h3><b>\u8f90\u5c04\u901a\u91cf(Radiant Flux)<\/b><\/h3>\n<p>\u8f90\u5c04\u901a\u91cf\u4e5f\u79f0\u4e3a\u8f90\u5c04\u529f\u7387<b>(Radiant Power)<\/b>\uff0c\u6307\u7684\u662f\u8f90\u5c04\u80fd\u91cf\u9664\u4ee5\u65f6\u95f4\uff0c\u4e5f\u5c31\u662f\u5355\u4f4d\u65f6\u95f4\u7684\u80fd\u91cf\uff0c\u8bb0\u4e3a\u03a6\uff0c\u5355\u4f4d\u4e3aW\uff08\u74e6\u7279\uff09\u6216\u8005lm\uff08\u6d41\u660e\uff09\u3002\u540c\u6837\u4e5f\u53ef\u4ee5\u7528\u7269\u7406\u5f53\u4e2d\u7684\u529f\u7387\u6765\u8fdb\u884c\u7c7b\u6bd4\u3002<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4754 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_08.jpg\" alt=\"\" width=\"833\" height=\"167\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_08.jpg 833w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_08-300x60.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_08-768x154.jpg 768w\" sizes=\"(max-width: 833px) 100vw, 833px\" \/><\/p>\n<p>\u4e00\u822c\u504f\u5411\u7528\u8f90\u5c04\u901a\u91cf\u6765\u8861\u91cf\u7269\u4f53\u7684\u4eae\u5ea6\uff0c\u56e0\u4e3a\u6211\u4eec\u66f4\u5173\u5fc3\u7684\u662f\u5355\u4f4d\u65f6\u95f4\u7684\u4eae\u5ea6\u6548\u679c\uff0c\u4f8b\u5982\u5728\u8d2d\u4e70\u767d\u70bd\u706f\u6ce1\u7684\u65f6\u5019\u662f\u8bf430W\u4eae\u5ea6\u300150W\u4eae\u5ea6\u7b49\uff0c\u800c\u5728\u8d2d\u4e70\u6295\u5f71\u4eea\u7684\u65f6\u5019\u5219\u662f\u8bf43000lm\u4eae\u5ea6\u30015000lm\u4eae\u5ea6\u7b49\u3002<\/p>\n<h3>\u00a0<\/h3>\n<h3><b>\u8f90\u5c04\u5f3a\u5ea6(Radiant Intensity)<\/b><\/h3>\n<p>\u5728\u5177\u4f53\u7684\u6570\u5b66\u5b9a\u4e49\u4e4b\u524d\uff0c\u5148\u501f\u52a9\u5982\u4e0b\u4e00\u5f20\u56fe\u5efa\u7acb\u5bf9\u5269\u4e0b3\u4e2a\u6982\u5ff5\u7684\u4e00\u4e9b\u76f4\u89c2\u7684\u7406\u89e3<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4741 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/02\/Radiant_01.jpg\" alt=\"\" width=\"1177\" height=\"675\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/02\/Radiant_01.jpg 1177w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/02\/Radiant_01-300x172.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/02\/Radiant_01-1024x587.jpg 1024w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/02\/Radiant_01-768x440.jpg 768w\" sizes=\"(max-width: 1177px) 100vw, 1177px\" \/><\/p>\n<p data-pid=\"1H7t6VhF\"><b>1 Radiant Intensity\u5176\u5b9e\u5c31\u662f\u6307\u4ece\u4e00\u4e2a\u5149\u6e90\u51fa\u53d1\u5f80\u67d0\u4e00\u65b9\u5411\u4e0a\u53d1\u5c04\u7684\u5149\u7ebf\u7684\u4eae\u5ea6\uff0c\u53ef\u4ee5\u7406\u89e3\u4e3a\u67d0\u4e00\u65b9\u5411\u4e0a\u7684<\/b><b>\u8f90\u5c04\u901a\u91cf(Radiant Flux)<\/b><\/p>\n<p data-pid=\"Lo0rzncH\"><b>2 Irradiance\u6307\u67d0\u4e00\u5fae\u5c0f\u5e73\u9762\u6240\u63a5\u53d7\u5230\u7684\u5149\u7ebf\u4eae\u5ea6<\/b><\/p>\n<p data-pid=\"5uZWzyHo\"><b>3 Radiance\u6307\u67d0\u4e00\u5fae\u5c0f\u5e73\u9762\u4ece\u67d0\u4e2a\u65b9\u5411\u63a5\u53d7\uff08\u6216\u8005\u5411\u67d0\u4e2a\u65b9\u5411\u53d1\u5c04\uff09\u7684\u5149\u7ebf\u7684\u4eae\u5ea6<\/b><\/p>\n<p data-pid=\"WifY5O8e\">\u8f90\u5c04\u5f3a\u5ea6\u4e00\u53e5\u8bdd\u6765\u8bf4\u5c31\u662f\u4ece\u5149\u6e90\u53d1\u51fa\u7684<b>\u6bcf\u5355\u4f4d\u7acb\u4f53\u89d2\u65b9\u5411\u4e0a\u7684\u529f\u7387<\/b>\uff0c\u5355\u4f4d\u4e3acd\uff0c\u5173\u4e8e\u8f90\u5c04\u529f\u7387\u7684\u5b9a\u4e49\u5728\u4e0a\u6587\u5df2\u7ecf\u89e3\u91ca\uff0c\u8fd9\u91cc\u552f\u4e00\u8fd8\u4e0d\u77e5\u9053\u7684\u5c31\u662f\u7acb\u4f53\u89d2(Solid Angle)\u4e86\u3002<\/p>\n<p data-pid=\"WifY5O8e\"><img loading=\"lazy\" class=\"size-full wp-image-4757 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_09.jpg\" alt=\"\" width=\"1189\" height=\"489\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_09.jpg 1189w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_09-300x123.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_09-1024x421.jpg 1024w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_09-768x316.jpg 768w\" sizes=\"(max-width: 1189px) 100vw, 1189px\" \/><\/p>\n<p data-pid=\"4oGxJbjW\">solid angle\u5176\u5b9e\u5c31\u662f\u5bf9\u5e94\u4e8c\u7ef4\u7a7a\u95f4\u4e2d\u5706\u7684\u5f27\u5ea6\u5728\u4e09\u7ef4\u7a7a\u95f4\u4e2d\u7403\u4e0a\u7684\u62d3\u5c55\u3002 \u9996\u5148\u5728\u4e8c\u7ef4\u7a7a\u95f4\u4e0b\u8ba1\u7b97\u5f27\u5ea6\u516c\u5f0f\u5982\u4e0b\uff1a<\/p>\n<p data-pid=\"4oGxJbjW\"><img loading=\"lazy\" class=\"size-full wp-image-4742 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/02\/Radiant_02.jpg\" alt=\"\" width=\"486\" height=\"435\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/02\/Radiant_02.jpg 486w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/02\/Radiant_02-300x269.jpg 300w\" sizes=\"(max-width: 486px) 100vw, 486px\" \/><\/p>\n<p>\u5706\u7684\u5f27\u5ea6<strong>\u03b8 = l \/ r\uff0c<\/strong>\u5373\u5706\u5f27\u957f\u5ea6\u9664\u4ee5\u534a\u5f84\uff0c\u6574\u4e2a\u5706\u5f62\u7684\u5f27\u5ea6\u4e3a<strong>2\u03c0<\/strong>\uff0c\u5f27\u5ea6\u7684\u5927\u5c0f\u548c\u6247\u5f62\u7684\u89d2\u5ea6\u6709\u5173\uff0c\u4e0e\u5706\u5f62\u7684\u5927\u5c0f\u6ca1\u6709\u76f4\u63a5\u5173\u7cfb\u3002<\/p>\n<p>\u90a3\u4e48\u5bf9\u4e8e\u4e09\u7ef4\u7684\u7403\u4f53\u6765\u8bf4\u5462\uff1f<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4743 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/02\/Radiant_03.jpg\" alt=\"\" width=\"427\" height=\"395\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/02\/Radiant_03.jpg 427w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/02\/Radiant_03-300x278.jpg 300w\" sizes=\"(max-width: 427px) 100vw, 427px\" \/><\/p>\n<p>\u7403\u4f53\u7684\u7acb\u4f53\u89d2\u03a9 \u8ba1\u7b97\u65b9\u5f0f\u5982\u4e0b<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4744 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/02\/Radiant_04.jpg\" alt=\"\" width=\"206\" height=\"156\" \/><\/p>\n<p>\u5373\u7acb\u4f53\u89d2\u5ea6\u6240\u5bf9\u5e94\u7403\u4e0a\u7684<strong>\u6295\u5f71\u9762\u79ef\u9664\u4ee5\u534a\u5f84\u7684\u5e73\u65b9<\/strong>\uff0c\u6574\u4e2a\u7403\u7684\u7acb\u4f53\u89d2\u4e3a<strong>4\u03c0<\/strong>\uff0c\u540c\u6837\u7acb\u4f53\u89d2\u548c\u6247\u5f62\u4f53\u7684\u4e24\u4e2a\u89d2\u5ea6\u6709\u5173\uff0c\u4e0e\u7403\u4f53\u5927\u5c0f\u6ca1\u6709\u76f4\u63a5\u5173\u7cfb\u3002<\/p>\n<p>\u90a3\u4e48\u5bf9\u4e8e\u8f90\u5c04\u5f3a\u5ea6Radiant intensity\u7684\u5b9a\u4e49\u5f53\u4e2d\uff0c\u5fae\u5206\u7acb\u4f53\u89d2dw\u8ba1\u7b97\u5982\u4e0b\uff1a<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4748 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_05.jpg\" alt=\"\" width=\"1304\" height=\"709\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_05.jpg 1304w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_05-300x163.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_05-1024x557.jpg 1024w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_05-768x418.jpg 768w\" sizes=\"(max-width: 1304px) 100vw, 1304px\" \/><\/p>\n<p data-pid=\"E-1n0QBj\">\u9996\u5148\u901a\u8fc7<strong>\u03b8,\u03a6<\/strong>\u4e24\u4e2a\u89d2\u5ea6\u786e\u5b9a\u7a7a\u95f4\u4e2d\u4e00\u4e2a\u65b9\u5411\uff0c\u5728\u8fd9\u4e24\u4e2a\u89d2\u5ea6\u4e0a\u5206\u522b\u589e\u52a0\u4e00\u4e2a\u5fae\u5206\u503c<strong>d\u03b8<\/strong>\u548c<strong>d\u03a6<\/strong>\uff0c\u5219\u53ef\u4ee5\u8ba1\u7b97\u51fa\u5982\u56fe\u4e2d\u6240\u793a\u7684\u7403\u4e0a\u7684\u6295\u5f71\u9762\u79ef\u3002\u5176\u4e2d<strong>rd\u03b8<\/strong>\u5c31\u662f\u5fae\u5206\u9762\u79ef\u5143\u7684\u9ad8\uff0c<strong>rsin\u03b8d\u03a6<\/strong>\u662f\u5fae\u5206\u9762\u79ef\u5143\u7684\u5bbd\uff0c\u4e8c\u8005\u76f8\u4e58\u5c31\u662f\u9762\u79ef\uff0c\u518d\u6839\u636e\u7acb\u4f53\u89d2\u7684\u5b9a\u4e49\u9664\u4ee5 <strong>r\u7684\u5e73\u65b9<\/strong>\u00a0\u5373\u53ef\u5f97\u5230\u5fae\u5206\u7acb\u4f53\u89d2\u4e86\u3002<\/p>\n<p data-pid=\"oIb5OAaK\">\u8fd9\u91cc\u8fd8\u53ef\u4ee5\u9a8c\u8bc1\u4e0b\uff0c\u5bf9dw\u5728\u6574\u4e2a\u7403\u4e0a\u79ef\u5206\uff1a<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4751 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_06.jpg\" alt=\"\" width=\"365\" height=\"203\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_06.jpg 365w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_06-300x167.jpg 300w\" sizes=\"(max-width: 365px) 100vw, 365px\" \/><\/p>\n<p>\u4e0e\u4e4b\u524d\u6240\u8bb2\u7684\u7403\u7684\u7acb\u4f53\u89d2\u4e3a4\u03c0\u4e00\u81f4\u3002<\/p>\n<p>\u6ce8\u610f\u5728\u8ba1\u7b97\u5fae\u5206\u7acb\u4f53\u89d2\u4e4b\u524d\uff0c\u6211\u4eec\u5176\u5b9e\u9009\u5b9a\u4e86\u7a7a\u95f4\u5f53\u4e2d\u7684\u4e00\u4e2a\u65b9\u5411\uff08\u7531<strong>\u03b8,\u03a6<\/strong>\u6240\u786e\u5b9a\uff09\uff0c\u79f0\u8fd9\u4e2a\u65b9\u5411\u4e3aw\uff0c\u7136\u540e\u624d\u5728\u6b64\u57fa\u7840\u4e4b\u4e0a\u5206\u522b\u5bf9<strong>\u03b8,\u03a6<\/strong>\u589e\u52a0d<strong>\u03b8,d\u03a6<\/strong>\u7ecf\u8ba1\u7b97\u5f97\u5230\u6700\u7ec8\u7684dw\uff0c\u56e0\u6b64\u8f90\u5c04\u5f3a\u5ea6Radiant intensity\u7684\u7269\u7406\u542b\u4e49\u6b64\u65f6\u5c31\u5f88\u6e05\u695a\u4e86\uff0c\u4e3a\u5149\u6e90\u5411\u67d0\u4e00\u65b9\u5411\u7684\u5355\u4f4d\u7acb\u4f53\u89d2\u53d1\u5c04\u51fa\u7684\u5149\u7ebf\u7684\u529f\u7387\uff0c\u7b80\u800c\u8a00\u4e4b\u5c31\u662f\u5149\u6e90\u5728\u67d0\u4e2a\u65b9\u5411\u4e0a\u7684\u4eae\u5ea6\uff01<\/p>\n<p>\u5bf9\u4e8e\u5404\u65b9\u5411\u4eae\u5ea6\u4e00\u81f4\u7684\u70b9\u5149\u6e90\u8ba1\u7b97Radiant Intensity\u5982\u4e0b<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4752 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_07.jpg\" alt=\"\" width=\"1101\" height=\"705\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_07.jpg 1101w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_07-300x192.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_07-1024x656.jpg 1024w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_07-768x492.jpg 768w\" sizes=\"(max-width: 1101px) 100vw, 1101px\" \/><\/p>\n<p>\u56e0\u4e3a\u70b9\u5149\u6e90\u6240\u6709\u65b9\u5411\u4e0a\u7684\u4eae\u5ea6\u90fd\u4e0e\u65b9\u5411\u65e0\u5173\uff0c\u56e0\u6b64\u7acb\u4f53\u89d2\u53ef\u4ee5\u76f4\u63a5\u79ef\u5206\u51fa\u6765\u4e3a<strong>4\u03c0<\/strong>\uff0c\u6700\u7ec8\u8ba1\u7b97\u5f97\u70b9\u5149\u6e90\u4eae\u5ea6<strong>I = \u03a6 \/ 4\u03c0<\/strong>\u3002 (\u5982\u679c\u4e0d\u662f\u5404\u5411\u540c\u6027\u5149\u6e90\u7684\u8bdd\u8fd9\u91cc\u7684I(w)\u5e94\u8be5\u4e3a\u4e00\u4e2a\u5173\u4e8ew\u65b9\u5411\u7684\u7684\u51fd\u6570)\u3002<\/p>\n<h3>\u00a0<\/h3>\n<h3><b>Irradiance<\/b><\/h3>\n<p>Irradiance\u7684\u5b9a\u4e49\u662f\u6307\u6bcf\u5355\u4f4d<b>\u7167\u5c04<\/b>\u9762\u79ef\u6240\u63a5\u6536\u5230\u7684\u8f90\u5c04\u529f\u7387\uff0c\u5355\u4f4d\u4e3alux\uff0c\u5982\u4e0b\u56fe\u6240\u793a<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4762 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_10.jpg\" alt=\"\" width=\"969\" height=\"453\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_10.jpg 969w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_10-300x140.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_10-768x359.jpg 768w\" sizes=\"(max-width: 969px) 100vw, 969px\" \/><\/p>\n<p>\u4f46\u4e0a\u56fe\u4e2dirradiance\u7684\u5b9a\u4e49\u662f\u6307\u5149\u7ebf\u4e0e\u5355\u4f4d\u5e73\u9762\u5782\u76f4\u65f6\u7684\u8ba1\u7b97\u65b9\u5f0f\uff0c\u5f53\u5149\u7ebf\u4e0e\u5355\u4f4d\u5e73\u9762\u6cd5\u7ebf\u6709\u4e00\u4e2a\u5939\u89d2\u65f6\uff0c\u5728\u8ba1\u7b97\u65f6\u5149\u7ebf\u4eae\u5ea6\u9700\u8981\u4e58\u4e0a\u4e00\u4e2acos\u03b8\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4763 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_11.png\" alt=\"\" width=\"764\" height=\"308\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_11.png 764w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_11-300x121.png 300w\" sizes=\"(max-width: 764px) 100vw, 764px\" \/><\/p>\n<p>\u5f53\u5149\u7ebf\u5782\u76f4\u7167\u5c04\u5e73\u9762\u65f6\uff0c\u5982\u4e0a\u56fe\u5de6\u8fb9\u6240\u793a\uff0c<b>\u7167\u5c04<\/b>\u5230\u5e73\u9762\u4e0a\u7684\u9762\u79ef\u4e0e\u5149\u7ebf\u672c\u8eab\u7684\u201c\u5bbd\u5ea6\u4e00\u81f4\u201d\u3002\u4f46\u5f53\u5149\u7ebf\u659c\u7740\u7167\u5c04\u5230\u5e73\u9762\u65f6\uff0c\u6b64\u65f6\u7684<b>\u7167\u5c04<\/b>\u9762\u79ef\u5c31\u4e0d\u518d\u662f\u5149\u7ebf\u672c\u8eab\u7684\u201c\u5bbd\u5ea6\u201d\u4e86\uff0c\u5177\u4f53\u6765\u8bf4\u6b64\u65f6\u7684\u7167\u5c04\u9762\u79ef<strong>A2 = A \/ cos\u03b8<\/strong>\u3002<\/p>\n<p>\u53cd\u8fc7\u6765\u7406\u89e3\u5c31\u662f\u5149\u7ebf\u89d2\u5ea6\u4e0e\u5e73\u9762\u6cd5\u7ebf\u6709\u5939\u89d2\u65f6\uff0c\u76f8\u6bd4\u4e8e\u5149\u7ebf\u5782\u76f4\u7167\u5c04\u5e73\u9762\uff0c\u5355\u4f4d\u9762\u79ef\u63a5\u53d7\u5230\u7684\u5149\u7ebf\u51cf\u5c11\u4e86<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4764 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_12.jpg\" alt=\"\" width=\"1251\" height=\"662\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_12.jpg 1251w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_12-300x159.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_12-1024x542.jpg 1024w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_12-768x406.jpg 768w\" sizes=\"(max-width: 1251px) 100vw, 1251px\" \/><\/p>\n<p>\u501f\u52a9\u4e8eirradiance\uff0c\u4e5f\u53ef\u4ee5\u5f88\u8f7b\u677e\u7684\u89e3\u91ca\u5728Blinn-Phong\u6240\u63d0\u5230\u7684Lambert&#8217;s Cosine Law\u4e3a\u4ec0\u4e48\u8981\u4e58\u4ee5cos\u03b8\u4e86\u3002<\/p>\n<p>\u5bf9\u6bd4\u73b0\u5b9e\u4e2d\uff0c\u4e00\u5e74\u56db\u5b63\u7684\u6e29\u5ea6\u53d8\u5316\uff0c\u5c31\u662f\u56e0\u4e3a\u592a\u9633\u7167\u5c04\u5730\u7403\u4e0d\u540c\u533a\u57df\u7684\u5149\u7ebf\u89d2\u5ea6\u4e0d\u540c\u3002<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4778 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_20.jpg\" alt=\"\" width=\"999\" height=\"553\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_20.jpg 999w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_20-300x166.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_20-768x425.jpg 768w\" sizes=\"(max-width: 999px) 100vw, 999px\" \/><\/p>\n<p>\u8fd8\u6709\u5149\u7ebf\u8d8a\u8fdc\u4f1a\u66f4\u52a0\u8870\u51cf\u7684\u73b0\u8c61\u4e5f\u5b8c\u5168\u53ef\u4ee5\u7528irradiance\u89e3\u91ca\uff0c\u56e0\u4e3a\u5149\u7684\u529f\u7387\u59cb\u7ec8\u4e00\u81f4\uff0c\u79bb\u70b9\u5149\u6e90\u8d8a\u8fdc\u6240\u7167\u5c04\u5230\u7684\u5706\u7403\u9762\u79ef\u4e5f\u5c31\u8d8a\u5927\uff0c\u56e0\u6b64\u6839\u636eirradiance\u7684\u5f0f\u5b50\uff0c\u5206\u6bcd\u7684\u5355\u4f4d\u9762\u79ef\u503c\u4e5f\u5c31\u8d8a\u5927\uff0cirradiance\u4e5f\u5c31\u8870\u51cf\u5230\u8d8a\u5c0f\uff08\u8f90\u5c04\u5f3a\u5ea6Radiant Intensity\u4e0d\u4f1a\u8870\u51cf\uff0c\u56e0\u4e3a\u53ea\u4e0e\u7acb\u4f53\u89d2\u6709\u5173\uff0c\u4e0e\u534a\u5f84r\u65e0\u5173\uff09\uff0c\u8870\u51cf\u901f\u5ea6\u4e3a\u534a\u5f84r\u7684\u5e73\u65b9\u3002<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4767 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_13.jpg\" alt=\"\" width=\"1017\" height=\"756\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_13.jpg 1017w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_13-300x223.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_13-768x571.jpg 768w\" sizes=\"(max-width: 1017px) 100vw, 1017px\" \/><\/p>\n<h3>\u00a0<\/h3>\n<h3><b>radiance<\/b><\/h3>\n<p>radiance\u4e00\u822c\u7528\u4e8e\u8861\u91cf\u5149\u7ebf\u643a\u5e26\u7684\u80fd\u91cf\uff0c\u7269\u7406\u610f\u4e49\u4e0a\u662f\u6307<b>\u6bcf\u5355\u4f4d\u7acb\u4f53\u89d2\uff0c\u6bcf\u5355\u4f4d\u5782\u76f4\u9762\u79ef\u7684\u529f\u7387<\/b>\uff0c\u6ce8\u610f\u8fd9\u91cc\u662f\u4e24\u6b21\u5fae\u5206\uff0c<b>\u5b83\u540c\u65f6\u6307\u5b9a\u4e86\u5149\u7684\u65b9\u5411\u4e0e\u7167\u5c04\u5230\u7684\u8868\u9762\u6240\u63a5\u53d7\u5230\u7684\u4eae\u5ea6<\/b>\u3002<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4768 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_14.jpg\" alt=\"\" width=\"823\" height=\"410\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_14.jpg 823w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_14-300x149.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_14-768x383.jpg 768w\" sizes=\"(max-width: 823px) 100vw, 823px\" \/><\/p>\n<p>\u6ce8\u610fradiance\u65e2\u53ef\u4ee5\u7528\u4e8e\u6bcf\u5355\u4f4d\u5782\u76f4\u9762\u79ef\u5411\u6bcf\u5355\u4f4d\u7acb\u4f53\u89d2<strong>\u53d1\u5c04<\/strong>\uff08\u4ee5\u53ca\u53cd\u5c04\u3001\u6298\u5c04\u7b49\uff09\u7684\u529f\u7387\uff08Exiting Radiance\uff09\uff0c\u4e5f\u53ef\u4ee5\u7528\u4e8e\u6bcf\u5355\u4f4d\u5782\u76f4\u9762\u79ef\u4ece\u6bcf\u5355\u4f4d\u7acb\u4f53\u89d2<strong>\u63a5\u6536<\/strong>\u7684\u529f\u7387\uff08Incident Radiance\uff09\u3002<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-4782\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_21.jpg\" alt=\"\" width=\"1169\" height=\"460\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_21.jpg 1169w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_21-300x118.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_21-1024x403.jpg 1024w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_21-768x302.jpg 768w\" sizes=\"(max-width: 1169px) 100vw, 1169px\" \/><\/p>\n<p>\u56de\u8fc7\u5934\u6765\u770b\u4e00\u4e0b Radiant Intensity\u548cIrradiance\u4ee5\u53caRadiance\u4e09\u8005\u7684\u5b9a\u4e49<\/p>\n<ul>\n<li>Radiant Intensity\uff1a\u6bcf\u7acb\u4f53\u89d2\u53d1\u5c04\u7684\u529f\u7387<\/li>\n<li>Irradiance\uff1a\u6bcf\u5355\u4f4d\u9762\u79ef\u63a5\u6536\u7684\u529f\u7387<\/li>\n<li>Radiance\uff1a\u6bcf\u5355\u4f4d\u9762\u79ef\u4ece\u6bcf\u7acb\u4f53\u89d2\u63a5\u6536\u7684\u529f\u7387<\/li>\n<\/ul>\n<p>\u90a3\u4e48\u5c31\u53ef\u4ee5\u5f97\u5230<\/p>\n<ul>\n<li>Radiance\uff1aRadiant\u00a0 Intensity \/ \u5355\u4f4d\u9762\u79ef<\/li>\n<li>Radiance\uff1aIrradiance \/ \u7acb\u4f53\u89d2<\/li>\n<\/ul>\n<p>\u4f46\u8fd9\u91cc\u6709\u4e00\u4e2a\u7ec6\u5fae\u7684\u533a\u522b\uff0c\u5728irradiance\u4e2d\u5b9a\u4e49\u7684\u6bcf\u5355\u4f4d\u7167\u5c04\u9762\u79ef\uff0c\u800c\u5728radiance\u5f53\u4e2d\uff0c\u4e3a\u4e86\u66f4\u597d\u7684\u4f7f\u5176\u6210\u4e3a\u63cf\u8ff0\u4e00\u6761\u5149\u7ebf\u4f20\u64ad\u4e2d\u7684\u4eae\u5ea6\uff0c\u4e14\u5728\u4f20\u64ad\u8fc7\u7a0b\u5f53\u4e2d\u5927\u5c0f\u4e0d\u968f\u65b9\u5411\u6539\u53d8\uff0c\u6240\u4ee5\u5728\u5b9a\u4e49\u4e2d\u5173\u4e8e\u63a5\u6536\u9762\u79ef\u7684\u90e8\u5206\u662f\u6bcf\u5355\u4f4d\u5782\u76f4\u9762\u79ef\uff0c\u800c\u8fd9\u4e00\u70b9\u7684\u4e0d\u540c\u4e5f\u6b63\u89e3\u91ca\u4e86\u56fe\u4e2d\u5f0f\u5b50\u5206\u6bcd\u4e0a\u7684cos\u03b8\uff0c\u5177\u4f53\u53ef\u4ee5\u89c2\u5bdf\u5982\u4e0b\u56fe\uff1a<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4770 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_16.png\" alt=\"\" width=\"945\" height=\"382\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_16.png 945w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_16-300x121.png 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_16-768x310.png 768w\" sizes=\"(max-width: 945px) 100vw, 945px\" \/><\/p>\n<p>\u5373\u56fe\u4e2d\u7684dA\u662firradiance\u4e2d\u5b9a\u4e49\u6240\u5bf9\u5e94\u7684\uff0c\u800c <strong>dA\u22a5 <\/strong>\u624d\u662fradiance\u4e2d\u6240\u5b9a\u4e49\u7684\u9762\u79ef\u3002\u4e8c\u8005\u4e4b\u95f4\u7684\u5173\u7cfb\u4e3a<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4772 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_17.jpg\" alt=\"\" width=\"271\" height=\"75\" \/><\/p>\n<p>\u5728\u7406\u89e3\u4e86radiance\u548cirradiance\u7684\u5b9a\u4e49\u4e4b\u540e\uff0c\u518d\u8ba8\u8bba\u8ba8\u8bba\u5b83\u4eec\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u901a\u8fc7\u4e8c\u8005\u7684\u5b9a\u4e49\u5f0f\u5b50\uff0c\u4e0d\u96be\u5f97\u51fa\u5982\u4e0b\u7ed3\u679c\uff1a<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4773 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_18.jpg\" alt=\"\" width=\"248\" height=\"95\" \/><\/p>\n<p>\u8fdb\u4e00\u6b65\u63a8\u5bfc\u5f97\u5230\uff1a<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4774 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_19.jpg\" alt=\"\" width=\"811\" height=\"475\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_19.jpg 811w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_19-300x176.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_19-768x450.jpg 768w\" sizes=\"(max-width: 811px) 100vw, 811px\" \/><\/p>\n<p>\u89c2\u5bdf\u4e00\u4e0b\u79ef\u5206\u540e\u7684\u5f0f\u5b50\uff0cE(p)\u5c31\u662f\u70b9p\u7684irradiance\uff0c\u5176\u7269\u7406\u542b\u4e49\u662f\u4e0a\u6587\u6240\u63d0\u5230\u8fc7\u7684\u70b9p\u4e0a<b>\u6bcf\u5355\u4f4d\u7167\u5c04\u9762\u79ef\u7684\u529f\u7387<\/b>\uff0c\u800cLi(p,w)\u6307\u5165\u5c04\u5149<b>\u6bcf\u7acb\u4f53\u89d2\uff0c\u6bcf\u5782\u76f4\u9762\u79ef\u7684\u529f\u7387<\/b>\u3002<\/p>\n<p>\u56e0\u6b64\u79ef\u5206\u5f0f\u5b50\u53f3\u8fb9\u7684<strong>cos\u03b8<\/strong>\u89e3\u91ca\u4e86\u9762\u79ef\u4e0a\u5b9a\u4e49\u7684\u5dee\u5f02\uff0c\u800c\u5bf9<strong>dw<\/strong>\u79ef\u5206\uff0c\u5219\u662f\u76f8\u5f53\u4e8e\u5bf9\u6240\u6709\u4e0d\u540c\u89d2\u5ea6\u7684\u5165\u5c04\u5149\u7ebf\u505a\u4e00\u4e2a\u6c42\u548c\uff0c\u90a3\u4e48\u8be5\u79ef\u5206\u5f0f\u5b50\u7684\u7269\u7406\u542b\u4e49\u4fbf\u662f\uff0c\u4e00\u4e2a\u70b9(\u5fae\u5206\u9762\u79ef\u5143)\u6240\u63a5\u6536\u5230\u7684\u5149\u7ebf\u4eae\u5ea6(irradiance)\uff0c\u7531\u6240\u6709\u4e0d\u540c\u65b9\u5411\uff08\u7acb\u4f53\u89d2\uff09\u7684\u5165\u5c04\u5149\u7ebf\u4eae\u5ea6(radiance)\u5171\u540c\u8d21\u732e\u5f97\u5230\u3002<\/p>\n<h1>\u00a0<\/h1>\n<h1 style=\"text-align: center;\"><b>\u53cc\u5411\u53cd\u5c04\u5206\u5e03\u51fd\u6570(BRDF)<\/b><\/h1>\n<p>\u6240\u8c13BRDF\uff08Bidirectional Reflectance Distribution Function\uff0c\u53cc\u5411\u53cd\u5c04\u5206\u5e03\u51fd\u6570\uff09\uff0c\u6307\u7684\u662f\u4ece\u8f90\u5c04\u5ea6\u91cf\u5b66\u7684\u89d2\u5ea6\u53bb\u7406\u89e3\u5149\u7ebf\u7684\u53cd\u5c04\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4797 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_22.jpg\" alt=\"\" width=\"1236\" height=\"590\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_22.jpg 1236w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_22-300x143.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_22-1024x489.jpg 1024w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_22-768x367.jpg 768w\" sizes=\"(max-width: 1236px) 100vw, 1236px\" \/><\/p>\n<p><b>\u53cd\u5c04\u5c31\u662f\u4e00\u4e2a\u70b9(\u5fae\u5206\u9762\u79ef\u5143)\u5728\u63a5\u53d7\u5230\u4e00\u5b9a\u65b9\u5411\u4e0a\u7684\u4eae\u5ea6<\/b>dE(\u03c9i)<b>\u4e4b\u540e\uff0c\u518d\u5411\u4e0d\u540c\u65b9\u5411\u628a\u80fd\u91cf\u8f90\u5c04\u51fa\u53bb<\/b>dLr(\u03c9r)<b>\u3002<\/b><\/p>\n<p>\u4ece\u76f4\u89c2\u7684\u7406\u89e3\u6765\u8bf4\uff0c\u4e0d\u540c\u6750\u8d28\u7684\u8868\u9762\u81ea\u7136\u4f1a\u628a\u4e00\u5b9a\u65b9\u5411\u4e0a\u7684\u5165\u5c04\u5149\u7ebf\u53cd\u5c04\u5230\u4e0d\u540c\u65b9\u5411\u4e0a\uff0c\u5982\u7406\u60f3\u5149\u6ed1\u8868\u9762\u4f1a\u628a\u5165\u5c04\u5149\u7ebf\u5b8c\u5168\u53cd\u5c04\u5230\u955c\u9762\u53cd\u5c04\u65b9\u5411\uff0c\u5176\u5b83\u65b9\u5411\u5219\u5b8c\u5168\u6ca1\u6709\uff1b\u800c\u7406\u60f3\u7c97\u7cd9\u8868\u9762\u4f1a\u628a\u5165\u5c04\u5149\u7ebf\u5747\u5300\u7684\u53cd\u5c04\u5230\u6240\u6709\u65b9\u5411\u3002<\/p>\n<p>\u56e0\u6b64\u6240\u8c13BRDF\u5c31\u662f\u63cf\u8ff0\u8fd9\u6837\u4e00\u4e2a\u5149\u7ebf\u4ece\u4e0d\u540c\u65b9\u5411\u5165\u5c04\u4e4b\u540e\uff0c\u53cd\u5c04\u5149\u7ebf\u7684\u5206\u5e03\u60c5\u51b5\u7684\u51fd\u6570\uff0c\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4798 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_23.jpg\" alt=\"\" width=\"1076\" height=\"605\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_23.jpg 1076w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_23-300x169.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_23-1024x576.jpg 1024w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_23-768x432.jpg 768w\" sizes=\"(max-width: 1076px) 100vw, 1076px\" \/><\/p>\n<p data-pid=\"M8obq2FA\">\u4e0a\u56fe\u4e2d\u4e0b\u65b9\u7684\u5f0f\u5b50\u5373\u4e3aBRDF\uff0c\u5b83\u63a5\u6536\u4e24\u4e2a\u53c2\u6570\uff0c\u5165\u5c04\u5149\u65b9\u5411<strong>\u03c9i<\/strong>\uff0c\u53cd\u5c04\u5149\u65b9\u5411<strong>\u03c9r<\/strong>\uff0c\u51fd\u6570\u503c\u4e3a\u53cd\u5c04\u5149\u7684radiance\u4e0e\u5165\u5c04\u5149\u7684iiradiance\u7684\u6bd4\u503c\u3002(\u4ece\u67d0\u4e2a\u65b9\u5411\u63a5\u53d7\u5230\u7684\u5149\u80fd\u6709\u591a\u5c11\u53cd\u5c04\u5230\u53e6\u5916\u4e00\u4e2a\u65b9\u5411\u3002)<\/p>\n<h3 data-pid=\"M8obq2FA\">\u00a0<\/h3>\n<h3 data-pid=\"M8obq2FA\">BRDF\u7684\u6027\u8d28<\/h3>\n<p>1.BRDF\u662f\u975e\u8d1f\u7684\uff08Non-negativity\uff09\uff0c\u8868\u793a\u4e86\u80fd\u91cf\u7684\u5206\u5e03<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4981 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/MaterialAppearance_33.jpg\" alt=\"\" width=\"340\" height=\"76\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/MaterialAppearance_33.jpg 340w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/MaterialAppearance_33-300x67.jpg 300w\" sizes=\"(max-width: 340px) 100vw, 340px\" \/><\/p>\n<p>2.BRDF\u662f\u7ebf\u6027\u7684\uff08Linearity\uff09\uff0c\u53ef\u4ee5\u62c6\u5206\u548c\u53e0\u52a0<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4982 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/MaterialAppearance_34.jpg\" alt=\"\" width=\"863\" height=\"379\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/MaterialAppearance_34.jpg 863w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/MaterialAppearance_34-300x132.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/MaterialAppearance_34-768x337.jpg 768w\" sizes=\"(max-width: 863px) 100vw, 863px\" \/><\/p>\n<p>3.BRDF\u662f\u53ef\u9006\u7684\uff08Reciprocity principle\uff09\uff0c\u8c03\u6362\u5165\u5c04\u65b9\u5411\u548c\u51fa\u5c04\u65b9\u5411\u4f9d\u7136\u6210\u7acb<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4983 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/MaterialAppearance_35.jpg\" alt=\"\" width=\"686\" height=\"329\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/MaterialAppearance_35.jpg 686w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/MaterialAppearance_35-300x144.jpg 300w\" sizes=\"(max-width: 686px) 100vw, 686px\" \/><\/p>\n<p>4.BRDF\u6ee1\u8db3\u80fd\u91cf\u5b88\u6052\uff08Energy conservation\uff09\uff0c\u5165\u5c04\u80fd\u91cf\u7b49\u4e8e\u53cd\u5c04\u80fd\u91cf\uff08\u5b58\u5728\u80fd\u91cf\u5438\u6536\u7684\u60c5\u51b5\u65f6\uff0c\u5165\u5c04\u80fd\u91cf\u5927\u4e8e\u53cd\u5c04\u80fd\u91cf\uff09\u3002<\/p>\n<p><img loading=\"lazy\" class=\"size-full wp-image-4984 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/MaterialAppearance_36.jpg\" alt=\"\" width=\"623\" height=\"105\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/MaterialAppearance_36.jpg 623w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/MaterialAppearance_36-300x51.jpg 300w\" sizes=\"(max-width: 623px) 100vw, 623px\" \/><\/p>\n<h1 data-pid=\"M8obq2FA\">\u00a0<\/h1>\n<h1 style=\"text-align: center;\" data-pid=\"M8obq2FA\">\u53cd\u5c04\u65b9\u7a0b<\/h1>\n<p data-pid=\"cPFMIuse\">\u501f\u52a9BRDF\uff0c\u53ef\u4ee5\u5b9a\u4e49\u51fa<b>\u53cd\u5c04\u65b9\u7a0b<\/b>\u5982\u4e0b\uff1a<\/p>\n<p data-pid=\"cPFMIuse\"><img loading=\"lazy\" class=\"size-full wp-image-4799 aligncenter\" src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_24.jpg\" alt=\"\" width=\"1141\" height=\"782\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_24.jpg 1141w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_24-300x206.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_24-1024x702.jpg 1024w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_24-768x526.jpg 768w\" sizes=\"(max-width: 1141px) 100vw, 1141px\" \/><\/p>\n<p data-pid=\"Xd0umBOJ\">\u5373\u6444\u50cf\u673a\u6240\u63a5\u53d7\u5230\u7684<strong>\u03c9r<\/strong>\u65b9\u5411\u4e0a\u7684\u53cd\u5c04\u5149\uff0c\u662f\u7531\u6240\u6709\u4e0d\u540c\u65b9\u5411\u4e0a\u5165\u5c04\u5149\u7ebf\u7684irradiance\u8d21\u732e\u5f97\u5230\u7684(\u5373\u56fe\u4e2d\u5f0f\u5b50\u7684<strong>Li(p,\u03c9i)cos\u03b8id\u03c9i<\/strong>)\uff0c\u800c\u4e0d\u540c\u65b9\u5411\u5165\u5c04\u5149\u7ebf\u7684irradiance\u5bf9\u53cd\u5c04\u65b9\u5411<strong>\u03c9r<\/strong>\u7684\u8d21\u732e\u7a0b\u5ea6\u5219\u7531\u7269\u4f53\u8868\u9762\u6750\u8d28\u51b3\u5b9a\uff0c\u6240\u4ee5\u4e58\u4e0a\u4e86\u4e00\u4e2aBRDF\u51fd\u6570\u3002<\/p>\n<p 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srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_25.jpg 1035w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_25-300x140.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_25-1024x478.jpg 1024w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_25-768x358.jpg 768w\" sizes=\"(max-width: 1035px) 100vw, 1035px\" \/><\/p>\n<p 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srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_30.jpg 1249w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_30-300x185.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_30-1024x632.jpg 1024w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_30-768x474.jpg 768w\" sizes=\"(max-width: 1249px) 100vw, 1249px\" \/><\/p>\n<p 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src=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_36.jpg\" alt=\"\" width=\"1089\" height=\"642\" srcset=\"https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_36.jpg 1089w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_36-300x177.jpg 300w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_36-1024x604.jpg 1024w, https:\/\/www.yumefx.com\/wp-content\/uploads\/2022\/03\/Radiant_36-768x453.jpg 768w\" sizes=\"(max-width: 1089px) 100vw, 1089px\" \/><\/p>\n<p 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