{"id":7,"date":"2010-08-07T15:26:00","date_gmt":"2010-08-07T07:26:00","guid":{"rendered":"http:\/\/gsakd878.wordpress.com\/2010\/08\/07\/%e5%90%84%e7%a7%8d%e5%85%89%e7%85%a7%e7%9a%84%e7%ae%97%e6%b3%95%e5%8e%9f%e7%90%86"},"modified":"2010-08-07T15:26:00","modified_gmt":"2010-08-07T07:26:00","slug":"%e5%90%84%e7%a7%8d%e5%85%89%e7%85%a7%e7%9a%84%e7%ae%97%e6%b3%95%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"https:\/\/www.keyboardmeow.com\/?p=7","title":{"rendered":"\u5404\u79cd\u5149\u7167\u7684\u7b97\u6cd5\u539f\u7406"},"content":{"rendered":"<p>\u539f\u6587\u94fe\u63a5\uff1a<a href=\"http:\/\/www.nitrogen.za.org\/viewtutorial.asp?id=5\">http:\/\/www.nitrogen.za.org\/viewtutorial.asp?id=5<\/a><\/p>\n<p>\u8fd9\u4e2a\u6559\u7a0b\u7528\u5230\u4e86\u5411\u91cf\u6570\u5b66\u77e5\u8bc6\uff0c\u5982\u679c\u4f60\u5bf9\u5411\u91cf\u6570\u5b66\u8fd8\u4e0d\u662f\u5f88\u4e86\u89e3\uff0c\u8bf7\u5148\u9605\u8bfb\u5411\u91cf\u6559\u7a0b\uff1aread the tutorial\u3002<\/p>\n<p>\u5149\u7167\u4e0e\u7269\u4f53\u8868\u9762\u7684\u76f8\u4e92\u4f5c\u7528\u53ef\u4ee5\u901a\u8fc7\u5c06\u4e00\u4e9b\u6570\u5b66\u516c\u5f0f\u5e94\u7528\u4e8e\u57fa\u4e8eper<br \/>\npixel\uff08\u533a\u522b\u4e8e\u57fa\u4e8e\u9876\u70b9\uff09\u7684\u7740\u8272\uff0c\u4ece\u800c\u6a21\u62df\u51fa\u771f\u5b9e\u751f\u6d3b\u4e2d\u7684\u5404\u79cd\u6750\u8d28\u6548\u679c\u3002\u6bd4\u5982\u6d6e\u96d5\u6548\u679c\uff0c\u6ce2\u6d6a\u6548\u679c\uff0c\u6cb9\u6f06\u6548\u679c\u7b49\u3002<\/p>\n<p>\u5728\u8fd9\u4e2a\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u6709\u5982\u4e0b\u5047\u5b9a\uff1a<\/p>\n<p>\u7b2c\u4e00\uff0c\u6211\u4eec\u8ba8\u8bba\u7684\u662f\u57fa\u4e8e\u50cf\u7d20\u7740\u8272\uff08per-pixel<br \/>\nbasis\uff09\uff0c\u6bcf\u4e2apixel\u6709\u5b83\u81ea\u5df1\u7684\u4f4d\u7f6e\u5411\u91cf\uff0c\u6cd5\u7ebf\u5411\u91cf\u4ee5\u53ca\u8868\u9762\u989c\u8272\uff08Surface<br \/>\ncolor\uff0c\u5728\u8fd9\u91cc\u53ef\u4ee5\u662f\u6765\u81ea\u7eb9\u7406\u7684\u989c\u8272\uff0c\u4e5f\u53ef\u4ee5\u662fRGB\u989c\u8272\uff08flat color\uff09\uff09\uff1b<\/p>\n<p>\u7b2c\u4e8c\uff0c\u8868\u9762\u989c\u8272\uff08Surface color\uff09\u901a\u5e38\u662f\u7531R,G,B\u4e09\u90e8\u5206\u7ec4\u6210\uff0c\u5728\u8fd9\u4e2a\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u628a\u5b83\u5f53\u4f5c\u4e00\u4e2a\u5411\u91cf\u770b\u5f85\uff1b<\/p>\n<p>\n\u7b2c\u4e09\uff0c\u8f93\u5165\u8868\u9762\u989c\u8272\uff08\u5149\u7167\u5904\u7406\u524d\u7684\u8868\u9762\u989c\u8272\uff0c\u8fd9\u91cc\u7684\u201c\u8f93\u5165\u201d\u53ef\u4ee5\u7406\u89e3\u4e3a\u51fd\u6570\u7684\u8f93\u5165\u53c2\u6570\u7684\u201c\u8f93\u5165\u201d\uff09\u53ea\u662f\u666e\u901a\u7684\u989c\u8272\uff08\u5355\u7eaf\u7684\u7eb9\u7406\u989c\u8272\u6216\u8005RGB\u989c\u8272\uff09\uff0c\u800c\u8f93\u51fa\u8868\u9762\u989c\u8272\uff08\u5149\u7167\u5904\u7406\u540e\u7684\u8868\u9762\u989c\u8272\uff09\u662f\u5149\u7167\u4f5c\u7528\u4e8e\u8868\u9762\u7684\u5408\u6210\u989c\u8272\uff0c\u5982\u53ef\u4ee5\u662f\u6709\u9634\u5f71\uff0c\u9ad8\u5149\u7b49\u6548\u679c\u7684\u989c\u8272\u3002<\/p>\n<p>\u7b2c\u56db\uff0c\u8fd9\u4e2a\u6559\u7a0b\u4e2d\u5047\u8bbe\u6bcf\u4e2a\u573a\u666f\u4e2d\u53ea\u6709\u4e00\u4e2a\u706f\u5149\u3002\u5bf9\u4e8e\u591a\u706f\u5149\u7684\u573a\u5408\uff0c\u5bf9\u6bcf\u4e00\u4e2a\u706f\u5149\u5faa\u73af\u8fdb\u884c\u8fd9\u4e9b\u8fd0\u7b97\uff08\u73af\u5883\u5149\u9664\u5916\uff09\u3002<\/p>\n<p>\u597d\u4e86\uff0c\u8ba9\u6211\u4eec\u5f00\u59cb\u8bb2\u89e3\u5404\u79cd\u5149\u7167\u7684\u7b97\u6cd5\u539f\u7406<\/p>\n<p>Ambient Lighting \u73af\u5883\u5149<\/p>\n<p>\n\u5728\u771f\u5b9e\u751f\u6d3b\u91cc\uff0c\u6709\u5149\u7ebf\u7684\u623f\u5b50\u91cc\u7684\u7269\u4f53\u4e0d\u4f1a\u662f\u5168\u9ed1\u7684\uff0c\u603b\u6709\u4e00\u4e9b\u5149\u91cf\u5b50\u7167\u4eae\u7269\u4f53\u8868\u9762\uff0c\u5373\u4f7f\u8fd9\u4e2a\u8868\u9762\u662f\u80cc\u5bf9\u5149\u6e90\u7684\uff0c\u8fd9\u5c31\u662f\u73af\u5883\u5149\u7684\u539f\u56e0\u3002\u6211\u4eec\u4e0d\u8003\u8651\u73af\u5883\u5149\u7684\u7167\u5c04\u65b9\u5411\uff0c\u6211\u4eec\u603b\u8ba4\u4e3a\u573a\u666f\u4e2d\u7684\u7269\u4f53\uff0c\u4e0d\u8bba\u5b83\u5728\u4ec0\u4e48\u4f4d\u7f6e\uff0c\u603b\u4f1a\u53d7\u5230\u4e00\u5b9a\u6570\u91cf\u7684\u73af\u5883\u5149\u7167\u5c04\uff08\u5168\u5c40\u7167\u660e\uff09\u3002\u73af\u5883\u5149\u7167\u7b97\u6cd5\u5982\u4e0b\uff1a<\/p>\n<p>Inputs:<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nCol \u2013 \u7269\u4f53\u539f\u8868\u9762\u989c\u8272<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nAmbAmount \u2013 \u573a\u666f\u4e2d\u73af\u5883\u5149\u7684\u5f3a\u5f31\u7a0b\u5ea6 (\u4ecb\u4e8e0 \u5230 1\u4e4b\u95f4)<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0<br \/>\nOutputs:<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nSurfaceColor \u2013 \u73af\u5883\u5149\u7167\u4f5c\u7528\u4e4b\u540e\u7684\u8868\u9762\u989c\u8272<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nSurfaceColor = Col*AmbAmount;<\/p>\n<p>\u00a0<\/p>\n<p>\u73af\u5883\u5149\u7167\u6548\u679c\u56fe\uff1a<\/p>\n<p>\u00a0<\/p>\n<p>Lambert Shading \uff08\u90ce\u4f2f\u7279\u7740\u8272\uff0c\u90ce\u4f2f\u7279\uff1a\u7269\u7406\u4e0a\u7684\u4eae\u5ea6\u5355\u4f4d\uff0c\u5728\u8fd9\u91cc\u5c31\u662f\u6f2b\u5c04\u5149\u4f5c\u7528\uff09<\/p>\n<p>\n\u73b0\u5728\u6211\u4eec\u771f\u6b63\u5f00\u59cb\u8003\u8651\u4e00\u675f\u5149\u7167\u5c04\u5728\u7269\u4f53\u8868\u9762\u4e0a\u7684\u4f5c\u7528\u8fc7\u7a0b\uff0c\u6211\u4eec\u4f7f\u7528\u6700\u5e38\u89c1\u7684\u5149\u7167\u7b97\u6cd5-------\u6f2b\u53cd\u5c04\u5149\u7167\u7740\u8272\u6216\u8005\u8bf4\u90ce\u4f2f\u7279\u4f59\u5f26\u5b9a\u5f8b\u6216\u90ce\u4f2f\u7279\u7740\u8272\uff08\u4e09\u4e2a\u90fd\u4e00\u56de\u4e8b\uff09\uff0c\u8fd9\u4e2a\u7b97\u6cd5\u662f\u5c06\u5165\u5c04\u5149\u4e0e\u8868\u9762\u6cd5\u7ebf\u5411\u91cf\u7684\u70b9\u79ef\u5f53\u4f5c\u6f2b\u53cd\u5c04\u5149\u7167\u5f3a\u5ea6\u56e0\u5b50\uff0c\u4e0b\u9762\u6211\u4eec\u770b\u770b\u73af\u5883\u5149\u7167\u4e0e\u6f2b\u5c04\u5149\u7167\u5171\u540c\u4f5c\u7528\u7684\u7b97\u6cd5:<\/p>\n<p>Inputs:<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nLCol \u2013 \u7167\u5c04\u5728\u8868\u9762\u4e0a\u7684\u6f2b\u5c04\u5149<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nPos \u2013 \u8868\u9762\u4e0a\u88ab\u7167\u5c04\u7684\u4f4d\u7f6e<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nLPos \u2013 \u6f2b\u5c04\u5149\u6e90\u7684\u4f4d\u7f6e<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nN -\u8868\u9762\u4e0a\u88ab\u7167\u5c04\u7684\u4f4d\u7f6e\u5904\u7684\u6cd5\u5411\u91cf<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nCol \u2013\u7269\u4f53\u539f\u8868\u9762\u989c\u8272<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nAmbAmount -\u573a\u666f\u4e2d\u73af\u5883\u5149\u7684\u5f3a\u5f31\u7a0b\u5ea6 (0 to 1)<\/p>\n<p>Outputs:<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nSurfaceColor -\u73af\u5883\u5149\u7167\u4e0e\u6f2b\u5c04\u5149\u7167\u5171\u540c\u4f5c\u7528\u4e4b\u540e\u7684\u8868\u9762\u989c\u8272<\/p>\n<p>\u00a0<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nVectorToLight = Normalise(LPos - Pos);<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nDiffuseFactor = Dot(VectorToLight, Normal); \/\/DiffuseFactor ranges<br \/>\nfrom 0 to 1<\/p>\n<p>\/\/\u5149\u7ebf\u4e0e\u8868\u9762\u6cd5\u7ebf\u5939\u89d2\u5927\u4e8e90\u5ea6\uff0c\u60f3\u50cf\u4e0b\u5149\u7ebf\u5728\u8868\u9762\u80cc\u9762\u5c04\u8fc7\u6765\uff0c\u6b63\u8868\u9762\u80af\u5b9a\u6ca1\u6709\u5149\u7167<\/p>\n<p>\u00a0\u00a0 if(DiffuseFactor<br \/>\n&lt; 0)<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nthen DiffuseFactor = 0;<\/p>\n<p>\u00a0<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\n\/\/\u73af\u5883\u5149\u7167\u4e0e\u6f2b\u5c04\u5149\u7167\u5171\u540c\u4f5c\u7528<\/p>\n<p>\u00a0\u00a0\u00a0<br \/>\nSurfaceColor = Col*AmbAmount + Col*DiffuseFactor*LCol;<\/p>\n<p>\u00a0<\/p>\n<p>\u73af\u5883\u5149\u4e0e\u6f2b\u5c04\u5149\u5171\u540c\u4f5c\u7528\u6548\u679c<\/p>\n<p>Specular Highlights\u955c\u9762\u9ad8\u5149<\/p>\n<p>\n\u73b0\u5728\u6211\u4eec\u8003\u8651\u7269\u4f53\u8868\u9762\u6709\u5149\u6cfd\u7684\u6548\u679c\uff0c\u8fd9\u79cd\u6548\u679c\u662f\u5c06Phong\u53cd\u5c04\u6a21\u578b\uff0c\u7ed3\u5408\u524d\u9762\u4e24\u4e2a\u5149\u7167\u4f5c\u7528\u800c\u6210\u3002\u8fd9\u4e2d\u5149\u7167\u6548\u679c\u8ba1\u7b97\u9700\u8981\u77e5\u9053\u89c2\u5bdf\u8005\u5728\u573a\u666f\u4e2d\u7684\u4f4d\u7f6e\uff0c\u800c\u5148\u524d\u7684\u73af\u5883\u5149\u7167\u4e0e\u6f2b\u5c04\u5149\u7167\u6548\u679c\u8ba1\u7b97\u90fd\u4e0e\u89c2\u5bdf\u8005\u6240\u5728\u4f4d\u7f6e\u65e0\u5173\u7684\u3002<\/p>\n<p>\n\u8fd9\u79cd\u5149\u7167\u8ba1\u7b97\u662f\u8fd9\u6837\u7684\uff0c\u9996\u5148\u6211\u4eec\u8ba1\u7b97\u5165\u5c04\u5149\u5728\u8868\u9762\u5904\u7684\u53cd\u5c04\u5149\u7ebf\uff0c\u7136\u540e\u518d\u5c06\u53cd\u5c04\u5149\u7ebf\u4e0e\u89c6\u7ebf\uff08\u89c2\u5bdf\u8005\u7684\u773c\u775b\u4e0e\u8868\u9762\u89c2\u5bdf\u70b9\u7684\u8fde\u7ebf\uff09\u4e4b\u95f4\u7684\u70b9\u79ef\u503c\u5f53\u4f5c\u53cd\u5c04\u5230\u89c2\u5bdf\u8005\u773c\u4e2d\u7684\u5149\u7167\u5f3a\u5ea6\u56e0\u5b50\uff0c\u56e0\u4e3a\u8868\u9762\u4e0a\u9ad8\u4eae\u7684\u90e8\u5206\u662f\u53cd\u5c04\u5149\u7ebf\u53cd\u5c04\u5230\u89c2\u5bdf\u8005\u773c\u775b\u6216\u7167\u76f8\u673a\u4e2d\u8f83\u591a\u7684\u5730\u65b9\uff0c\u8fd9\u4e9b\u5730\u65b9\u7684\u53cd\u5c04\u5149\u7ebf\u4e0e\u89c6\u7ebf\u4e4b\u95f4\u7684\u5939\u89d2\u975e\u5e38\u5c0f\uff0c\u70b9\u79ef\u503c\u5c31\u8d8a\u5927\u3002<\/p>\n<p>Inputs:<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nViewPos \u2013 \u89c2\u5bdf\u8005\u7684\u4f4d\u7f6e<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nSpecAmount \u2013 \u955c\u9762\u5149\u5f3a\u5f31. (from 0 to about 200)<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nSpecCol \u2013 \u955c\u9762\u5149\u989c\u8272(\u901a\u5e38\u4e3a\u767d\u8272).<\/p>\n<p>\u00a0<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nLCol \u2013 \u7167\u5c04\u5728\u8868\u9762\u4e0a\u7684\u6f2b\u5c04\u5149<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nPos \u2013 \u8868\u9762\u4e0a\u88ab\u7167\u5c04\u7684\u4f4d\u7f6e<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nLPos \u2013 \u6f2b\u5c04\u5149\u6e90\u7684\u4f4d\u7f6e<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nN -\u8868\u9762\u4e0a\u88ab\u7167\u5c04\u7684\u4f4d\u7f6e\u5904\u7684\u6cd5\u5411\u91cf<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nCol \u2013\u7269\u4f53\u539f\u8868\u9762\u989c\u8272<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nAmbAmount -\u573a\u666f\u4e2d\u73af\u5883\u5149\u7684\u5f3a\u5f31\u7a0b\u5ea6 (0 to 1)<\/p>\n<p>\u00a0<\/p>\n<p>Outputs:<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nSurfaceColor -\u73af\u5883\u5149\u7167,\u6f2b\u5c04\u5149\u7167\u4e0e\u955c\u9762\u5149\u5171\u540c\u4f5c\u7528\u4e4b\u540e\u7684\u8868\u9762\u989c\u8272<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nDiffuseFactor = ... \/\/\u7ecf\u524d\u4e24\u4e2a\u5149\u7167\u4f5c\u7528\u5f97\u6765\u7684\u989c\u8272<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nDirectionToViewer = Normalise(ViewPos - Pos);<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nVectorToLight = Normalise(LPos - Pos);<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\n\/\/\u8ba1\u7b97\u53cd\u5c04\u5149<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nReflectanceRay = 2 * Dot(N, VectorToLight) * N - VectorToLight;<\/p>\n<p>\u00a0\u00a0\u00a0<\/p>\n<p>\u00a0\u00a0\u00a0<br \/>\n\/\/\u8ba1\u7b97\u955c\u9762\u5149\u7167\u56e0\u5b50. \u6570\u5b66\u516c\u5f0f SpecFac = (R dot N)^Spec<\/p>\n<p>\u00a0\u00a0\u00a0<br \/>\nSpecularFactor = Pow(Dot(ReflectanceRay, DirectionToViewer),<br \/>\nSpecAmount);<\/p>\n<p>\u00a0\u00a0\u00a0<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\n\/\/\u73af\u5883\u5149\u7167,\u6f2b\u5c04\u5149\u7167\u4e0e\u955c\u9762\u5149\u5171\u540c\u4f5c\u7528<\/p>\n<p>\u00a0\u00a0\u00a0<br \/>\nSurfaceColor = Col*AmbFactor + Col*DiffuseFactor*LCol +<br \/>\nSpecCol*SpecularFactor;<\/p>\n<p>\u00a0<\/p>\n<p>\u73af\u5883\u5149\u7167,\u6f2b\u5c04\u5149\u7167\u4e0e\u955c\u9762\u5149\u5171\u540c\u4f5c\u7528<\/p>\n<p>Note\uff1a\u53ef\u4ee5\u5728\u4e00\u4e2a\u573a\u666f\u4e2d\u4f7f\u7528\u591a\u4e2a\u6f2b\u5c04\u5149\u7167\u4e0e\u955c\u9762\u5149\u4f5c\u7528<\/p>\n<p>\u00a0<\/p>\n<p>Fresnel Term \u83f2\u6d85\u5c14\u51c6\u5219<\/p>\n<p>\n\u83f2\u6d85\u5c14\u6548\u679c\u662f\u6839\u636e\u89c2\u5bdf\u8005\u7684\u89c2\u5bdf\u8868\u9762\u6765\u8c03\u6574\u53cd\u5c04\u7387\u6765\u5b9e\u73b0\u7684\u3002\u6bd4\u5982\u4f60\u4ece\u6c34\u9762\uff0c\u6cb9\u6f06\u8868\u9762\u6216\u8005\u4e1d\u7ef8\u7684\u6b63\u4e0a\u65b9\u770b\uff0c\u53cd\u5c04\u5149\u6cfd\u7684\u67d4\u548c\u6548\u679c\u57fa\u672c\u6ca1\u6709\uff0c\u5982\u679c\u4fa7\u7740\u6216\u5e73\u7740\u770b\u7684\u8bdd\uff0c\u53cd\u5c04\u5149\u6cfd\u7684\u67d4\u548c\u6548\u679c\u5c31\u5f88\u660e\u663e\uff0c\u8fd9\u5c31\u662f\u83f2\u6d85\u5c14\u6548\u679c\u3002\u6211\u4eec\u7b80\u5355\u5730\u901a\u8fc7\u70b9\u79ef\u64cd\u4f5c\u8ba1\u7b97\u8868\u660e\u6cd5\u7ebf\u4e0e\u89c6\u7ebf\u4e4b\u95f4\u5939\u89d2\u7684\u4f59\u5f26\u503c\uff0c\u518d\u5c06\u8fd9\u4e2a\u503c\u52a0\u6743\u3002\u5bf9\u4e8e\u8f83\u5e73\u6ed1\u8868\u9762\uff0c\u52a0\u6743\u7cfb\u6570\u8bbe\u7f6e\u57281.0-5.0\u4e4b\u95f4\uff08\u6cb9\u6f06\u6548\u679c\uff0c\u4e1d\u7ef8\u7b49\uff09\uff0c\u5bf9\u4e8e\u6bd4\u8f83\u51f9\u51f8\u7684\u8868\u9762\uff0c\u52a0\u6743\u7cfb\u6570\u8bbe\u7f6e\u4e3a8.0\u6216\u66f4\u9ad8\uff08\u6c34\u6ce2\uff0c\u6db2\u4f53\u7b49\uff09<\/p>\n<p>Inputs:<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nViewPos \u2013 \u89c2\u5bdf\u8005\u7684\u4f4d\u7f6e<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nFresAmount \u2013 \u8fb9\u7f18\u6216\u8868\u9762\u7684\u5c16\u9510\u7a0b\u5ea6. (\u6cb9\u6f06\u4e1d\u7ef8\uff1a1\uff0c\u6db2\u4f53\uff1a 2-8)<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nFresCol - frenel \u53cd\u5c04\u5149 (\u901a\u5e38\u4f7f\u7528reflection map or \u7c7b\u4f3c\u7684\u4e1c\u897f).<\/p>\n<p>\u00a0<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nLCol \u2013 \u7167\u5c04\u5728\u8868\u9762\u4e0a\u7684\u6f2b\u5c04\u5149<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nPos \u2013 \u8868\u9762\u4e0a\u88ab\u7167\u5c04\u7684\u4f4d\u7f6e<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nLPos \u2013 \u6f2b\u5c04\u5149\u6e90\u7684\u4f4d\u7f6e<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nN -\u8868\u9762\u4e0a\u88ab\u7167\u5c04\u7684\u4f4d\u7f6e\u5904\u7684\u6cd5\u5411\u91cf<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nCol \u2013\u7269\u4f53\u539f\u8868\u9762\u989c\u8272<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nAmbAmount -\u573a\u666f\u4e2d\u73af\u5883\u5149\u7684\u5f3a\u5f31\u7a0b\u5ea6 (0 to 1)<\/p>\n<p>\u00a0<\/p>\n<p>Outputs:<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nSurfaceColor -\u73af\u5883\u5149\u7167,\u6f2b\u5c04\u5149\u7167\u4e0e\u955c\u9762\u5149\uff0c\u83f2\u6d85\u5c14\u53cd\u5c04\u5171\u540c\u4f5c\u7528\u4e4b\u540e\u7684\u8868\u9762\u989c\u8272<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nDiffuseFactor = ... \/\/\u73af\u5883\u5149\u7167\uff0c\u6f2b\u5c04\u5149\u7167\u4f5c\u7528\u5f97\u6765\u7684\u989c\u8272<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nSpecularFactor = ... \/\/\u955c\u9762\u9ad8\u5149\u4f5c\u7528\u5f97\u6765\u7684\u989c\u8272<\/p>\n<p>\u00a0<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nDirectionToViewer = Normalise(ViewPos - Pos);<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\n\/\/\u8ba1\u7b97fresnel\u56e0\u5b50.<br \/>\n\u6211\u4eec\u8ba1\u7b97\u89c6\u7ebf\u4e0e\u8868\u9762\u6cd5\u5411\u91cf\u95f4\u5939\u89d2\u7684\u4f59\u5f26\u503c(\u5728[-1..1]\u4e4b\u95f4)\uff0c\u7136\u540e\u52a0\u4e00\uff0c\u79fb\u52a8\u5230\u533a\u95f4[0..2]\uff0c\u7136\u540e\u518d\u52a0\u6743\u3002<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nFresnelTerm = Pow(Dot(N, DirectionToViewer)+1, FresAmount);<\/p>\n<p>\u00a0\u00a0\u00a0<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\n\/\/\u786e\u4fdd\u56e0\u5b50\u7684\u5728\u6b63\u5e38\u8303\u56f4\u5185<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nif (FresnelTerm &gt; 1)<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nthen FresnelTerm = 1;<\/p>\n<p>\u00a0\u00a0\u00a0<br \/>\n\/\/\u65e0\u83f2\u6d85\u5c14\u53cd\u5c04\u7684\u573a\u5408: Ambient light, Diffuse Light and Specular Light<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nNonReflective = Col*AmbFactor + Col*DiffuseFactor*LCol +<br \/>\nSpecCol*SpecularFactor;<\/p>\n<p>\u00a0<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\nReflective = FresCol;<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\n\/\/\u73af\u5883\u5149\u7167,\u6f2b\u5c04\u5149\u7167\u4e0e\u955c\u9762\u5149\uff0c\u83f2\u6d85\u5c14\u53cd\u5c04\u5171\u540c\u4f5c\u7528<\/p>\n<p>\u00a0\u00a0\u00a0<br \/>\nSurfaceColor = NonReflective*(1-FresnelTerm) +<br \/>\nReflective*FresnelTerm;<\/p>\n<p>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/p>\n<p>\n\u6f2b\u5c04\u65e0\u83f2\u6d85\u5c14\u53cd\u5c04\u65f6\u6548\u679c\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<br \/>\n\u6f2b\u5c04\u6709\u83f2\u6d85\u5c14\u53cd\u5c04\u65f6\u6548\u679c<\/p>\n<p>\u00a0<\/p>\n<p>\u00a0<\/p>\n<p>\u672c\u6587\u6765\u81eaCSDN\u535a\u5ba2\uff0c\u8f6c\u8f7d\u8bf7\u6807\u660e\u51fa\u5904\uff1a<a href=\"http:\/\/blog.csdn.net\/kesalin\/archive\/2008\/03\/30\/2230774.aspx\">http:\/\/blog.csdn.net\/kesalin\/archive\/2008\/03\/30\/2230774.aspx<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u539f\u6587\u94fe\u63a5\uff1ahttp:\/\/www.nitrogen.za.org\/viewtutorial.asp?id=5 \u8fd9 &hellip; <a href=\"https:\/\/www.keyboardmeow.com\/?p=7\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u201c\u5404\u79cd\u5149\u7167\u7684\u7b97\u6cd5\u539f\u7406\u201d<\/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":[16],"tags":[94,115,161,30,56,58],"class_list":["post-7","post","type-post","status-publish","format-standard","hentry","category-16","tag-pos","tag-115","tag-161","tag-30","tag-56","tag-58"],"_links":{"self":[{"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=\/wp\/v2\/posts\/7","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7"}],"version-history":[{"count":0,"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=\/wp\/v2\/posts\/7\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}