{"id":190,"date":"2011-03-19T13:46:39","date_gmt":"2011-03-19T05:46:39","guid":{"rendered":"http:\/\/gsakd878.wordpress.com\/?p=77"},"modified":"2011-03-19T13:46:39","modified_gmt":"2011-03-19T05:46:39","slug":"%e5%bf%ab%e9%80%9flightmap%e7%83%98%e7%84%99","status":"publish","type":"post","link":"https:\/\/www.keyboardmeow.com\/?p=190","title":{"rendered":"\u5feb\u901fLightMap\u70d8\u7119"},"content":{"rendered":"

\u4ec0\u4e48\u662f\u70d8\u7119? \u7b80\u5355\u5730\u8bf4, \u5c31\u662f\u628a\u7269\u4f53\u5149\u7167\u7684\u660e\u6697\u4fe1\u606f\u4fdd\u5b58\u5230\u7eb9\u7406\u4e0a, \u5b9e\u65f6\u7ed8\u5236\u65f6\u4e0d\u518d\u8fdb\u884c\u5149\u7167\u8ba1\u7b97, \u800c\u662f\u91c7\u7528\u9884\u5148\u751f\u6210\u7684\u5149\u7167\u7eb9\u7406(lightmap)\u6765\u8868\u793a\u660e\u6697\u6548\u679c. \u90a3\u4e48, \u8fd9\u6837\u6709\u4ec0\u4e48\u610f\u4e49\u5462?<\/p>\n

\u597d\u5904:<\/p>\n

    \n
  1. \u7531\u4e8e\u7701\u53bb\u4e86\u5149\u7167\u8ba1\u7b97, \u53ef\u4ee5\u63d0\u9ad8\u7ed8\u5236\u901f\u5ea6<\/li>\n
  2. \u5bf9\u4e8e\u4e00\u4e9b\u8fc7\u5ea6\u590d\u6742\u7684\u5149\u7167(\u5982\u5149\u7ebf\u8ffd\u8e2a, \u8f90\u5c04\u5ea6, AO\u7b49\u7b97\u6cd5), \u5b9e\u65f6\u8ba1\u7b97\u4e0d\u592a\u73b0\u5b9e. \u5982\u679c\u9884\u5148\u8ba1\u7b97\u597d\u4fdd\u5b58\u5230\u7eb9\u7406\u4e0a,\u00a0\u8fd9\u6837\u65e0\u7591\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u6a21\u578b\u7684\u5149\u5f71\u6548\u679c<\/li>\n
  3. \u4fdd\u5b58\u4e0b\u6765\u7684lightmap\u8fd8\u53ef\u4ee5\u8fdb\u884c\u4e8c\u6b21\u5904\u7406, \u5982\u505a\u4e00\u4e0b\u6a21\u7cca, \u8ba9\u9634\u5f71\u8fb9\u7f18\u66f4\u52a0\u67d4\u548c<\/li>\n<\/ol>\n

    \u5f53\u7136, \u7f3a\u70b9\u4e5f\u662f\u6709\u7684:<\/p>\n

      \n
    1. \u6a21\u578b\u989d\u5916\u591a\u4e86\u4e00\u5c42\u7eb9\u7406, \u8fd9\u6837\u76f8\u5f53\u4e8e\u589e\u52a0\u4e86\u8d44\u6e90\u7684\u7ba1\u7406\u6210\u672c(\u5f02\u6b65\u88c5\u8f7d, \u7248\u672c\u63a7\u5236, \u6587\u4ef6\u4f53\u79ef\u7b49). \u5f53\u7136, \u4e5f\u53ef\u4ee5\u9009\u62e9\u628a\u660e\u6697\u4fe1\u606f\u5199\u56de\u539f\u7eb9\u7406, \u4f46\u8fd9\u6837\u9650\u5236\u6bd4\u8f83\u591a, \u5982\u7eb9\u7406\u5750\u6807\u8303\u56f4, \u7269\u4f53\u5b9e\u4f8b\u4e2a\u6570...<\/li>\n
    2. \u6a21\u578b\u9700\u8981\u9694\u5916\u4e00\u5c42\u53ef\u4ee5\u5c55\u5f00\u5230\u4e00\u5f20\u7eb9\u7406\u5e73\u9762\u7684UV(\u8303\u56f4\u53ea\u80fd\u662f[0,1], \u4e0d\u80fd\u91cd\u5408). \u5982\u679c\u539f\u6a21\u578b\u672c\u8eab\u5c31\u662f\u8fd9\u6837, \u53ef\u4ee5\u7ed3\u7701\u6389. \u4f46\u5bf9\u4e8e\u5927\u591a\u6570\u6a21\u578b\u6765\u8bf4, \u53ef\u80fd\u4f1a\u91c7\u7528WRAP\/MIRROR\u5bfb\u5740, \u8fd9\u53ea\u80fd\u518d\u505a\u4e00\u5c42, \u518d\u8bf4\u4e0d\u80fd\u5f3a\u5236\u6bcf\u4e2a\u6a21\u578b\u53ea\u7528\u4e00\u5f20\u7eb9\u7406\u5427? \u6240\u4ee5, lightmap\u7684UV\u9700\u8981\u7f8e\u672f\u591a\u505a\u4e00\u5c42, \u7a0b\u5e8f\u5c55\u5f00\u7b97\u6cd5\u8fd9\u91cc\u4e0d\u63d0\u53ca....<\/li>\n
    3. \u9759\u6001\u7684\u5149\u5f71\u6548\u679c\u4e0e\u5bf9\u52a8\u6001\u7684\u5149\u5f71\u6ca1\u6cd5\u5f88\u597d\u7684\u7ed3\u5408. \u5982\u679c\u5149\u7167\u65b9\u5411\u6539\u53d8\u4e86\u7684\u8bdd, \u9759\u6001\u5149\u5f71\u6548\u679c\u662f\u65e0\u6cd5\u8fdb\u884c\u53d8\u6362\u7684. \u800c\u4e14\u5bf9\u4e8e\u9759\u6001\u7684\u9634\u5f71, \u6ca1\u6cd5\u76f4\u63a5\u5f71\u54cd\u5230\u52a8\u6001\u7684\u6a21\u578b. \u8fd9\u4e00\u70b9, \u53cd\u800c\u5f71\u54cd\u4e86\u771f\u5b9e\u5ea6<\/li>\n<\/ol>\n

      \u80af\u5b9a\u4e0d\u53ea\u8fd9\u51e0\u70b9,\u4f46\u6211\u6682\u65f6\u53ea\u60f3\u5230\u8fd9\u51e0\u70b9<\/p>\n

      \u90a3\u4e48\u600e\u4e48\u751f\u6210lightmap\u5462?<\/p>\n

      \u6700\u76f4\u63a5\u7684\u529e\u6cd5: \u5149\u7ebf\u8ffd\u8e2a....(\u539f\u7406\u60f3\u60f3\u5f88\u7b80\u5355, \u6309\u7167\u7269\u4f53\u5b9a\u5f8b\u6765\u5c31\u53ef\u4ee5\u4e86)<\/p>\n

      \u4f46\u662f\u5149\u7ebf\u8ffd\u8e2a\u8fd9\u4e1c\u897f......\u5c31\u7b97\u7528\u6765\u79bb\u7ebf\u751f\u6210\u6211\u90fd\u5acc\u6162-_-<\/p>\n

      \u4e0b\u9762\u8bf4\u7684\u8fd9\u4e2a\u662f\u5229\u7528GPU\u8fdb\u884c\u8ba1\u7b97\u7684, \u8ddf\u5b9e\u65f6\u5149\u7167\u6ca1\u4ec0\u4e48\u4e24\u6837:<\/p>\n

      \u539f\u7406:<\/p>\n

      \u60f3\u60f3\u5b9e\u65f6\u6e32\u67d3\u7684\u9876\u70b9\u53d8\u6362\u6d41\u7a0b: pos * WVP\u4e4b\u540e, \u9876\u70b9\u5750\u6807\u5c31\u53d8\u6362\u5230\u5c4f\u5e55\u7a7a\u95f4\u4e86[-1, 1]<\/p>\n

      \u5982\u679cVertexShader\u91cc\u76f4\u63a5\u628a\u7eb9\u7406\u5750\u6807\u505a\u4e3a\u53d8\u6362\u7ed3\u679c\u8f93\u51fa(\u6ce8\u610f\u4ece[0,1]\u53d8\u6362\u5230[-1,1]), \u90a3\u4e48\u76f8\u5f53\u4e8e\u76f4\u63a5\u53d8\u6362\u5230\u4e86\u7eb9\u7406\u5750\u6807\u7cfb, \u8fd9\u65f6\u5728PixelShader\u91cc\u8fd8\u662f\u50cf\u539f\u6765\u90a3\u6837\u8ba1\u7b97\u5149\u7167, \u8f93\u51fa\u7684\u7ed3\u679c\u5c31\u53ef\u4ee5\u62ff\u6765\u505alightmap\u4e86<\/p>\n

      \u793a\u4f8b:<\/p>\n

      \u8fd9\u662f\u4e00\u4e2a\u5178\u578b\u7684Phong\u5149\u7167\u6a21\u578b\u4e0b\u7684\u7403(\u8fd9\u91cc\u4e0d\u8003\u8651\u9634\u5f71\u6548\u679c, \u5bf9\u5b83\u4e0d\u9700\u8981\u8fdb\u884c\u7279\u6b8a\u5904\u7406):<\/p>\n

      \"\"<\/p>\n

      \u8fd9\u662fVS:<\/p>\n

       <\/p>\n

      \n
      \n
      view plain<\/a>copy to clipboard<\/a>print<\/a>?<\/a><\/div>\n<\/div>\n
        \n
      1. VS_OUTPUT\u00a0vs_main(\u00a0VS_INPUT\u00a0Input\u00a0)<\/li>\n
      2. {<\/li>\n
      3. VS_OUTPUT\u00a0Output\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0=\u00a0(VS_OUTPUT)0;<\/li>\n
      4. <\/li>\n
      5. Output.Position\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0=\u00a0mul(\u00a0Input.Position,\u00a0matViewProjection\u00a0);<\/li>\n
      6. <\/li>\n
      7. Output.Texcoord\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0=\u00a0Input.Texcoord;<\/li>\n
      8. <\/li>\n
      9. float3\u00a0fvObjectPosition\u00a0=\u00a0mul(\u00a0Input.Position,\u00a0matView\u00a0);<\/li>\n
      10. <\/li>\n
      11. Output.ViewDirection\u00a0\u00a0\u00a0\u00a0=\u00a0fvEyePosition\u00a0-\u00a0fvObjectPosition;<\/li>\n
      12. Output.LightDirection\u00a0\u00a0\u00a0=\u00a0fvLightPosition\u00a0-\u00a0fvObjectPosition;<\/li>\n
      13. Output.Normal\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0=\u00a0mul(\u00a0Input.Normal,\u00a0matView\u00a0);<\/li>\n
      14. <\/li>\n
      15. return(\u00a0Output\u00a0);<\/li>\n
      16. }<\/li>\n<\/ol>\n<\/div>\n

         <\/p>\n

        \u628a\u539f\u6765\u7684WVP\u53d8\u6362\u6539\u6210\u53d8\u6362\u5230\u7eb9\u7406\u5750\u6807\u7cfb:<\/p>\n

         <\/p>\n

        \n
        \n
        view plain<\/a>copy to clipboard<\/a>print<\/a>?<\/a><\/div>\n<\/div>\n
          \n
        1. \/\/Output.Position\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0=\u00a0mul(\u00a0Input.Position,\u00a0matViewProjection\u00a0);<\/li>\n
        2. \/\/\u00a0transform\u00a0to\u00a0projection\u00a0space<\/li>\n
        3. Output.Position.xy\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0=\u00a0Input.Texcoord\u00a0*\u00a0float2(2,\u00a0-2)\u00a0+\u00a0float2(-1,\u00a01);<\/li>\n
        4. Output.Position.w\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0=\u00a01;<\/li>\n<\/ol>\n<\/div>\n

           <\/p>\n

          \u8f93\u51fa\u7684\u7ed3\u679c\u5c31\u6210\u8fd9\u6837\u4e86:<\/p>\n

          \"\"<\/p>\n

          \u4fdd\u5b58\u4e0b\u6765\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528. \u8fd9\u91cc\u6211\u7528\u7684\u6a21\u578b\u6bd4\u8f83\u7279\u6b8a, \u672c\u8eab\u7684UV\u5c31\u6ee1\u8db3\u524d\u9762\u63d0\u5230\u7684\u6761\u4ef6, \u6240\u4ee5\u76f4\u63a5\u8ddf\u539f\u7eb9\u7406\u53e0\u52a0\u5c31\u53ef\u4ee5. \u5f53\u7136, \u5982\u679c\u53ea\u4fdd\u5b58\u660e\u6697\u4fe1\u606f\u7684\u8bdd, \u5c31\u4e0d\u5f71\u54cd\u539f\u7eb9\u7406\u7684\u590d\u7528, \u56e0\u4e3a\u901a\u5e38lightmap\u4e0d\u9700\u8981\u5f88\u9ad8\u7684\u7cbe\u5ea6:<\/p>\n

          \"\"<\/p>\n

          \u6709\u4e86lightmap, \u518d\u6b21\u753b\u7684\u65f6\u5019\u5c31\u7b80\u5355\u4e86, \u53ea\u9700\u8981\u8d34\u7eb9\u7406, \u5149\u7167\u5927\u53ef\u4ee5\u5173\u6389:<\/p>\n

          \"\"<\/p>\n

          \u5982\u679c\u8fd8\u60f3\u8981\u4e00\u66f4\u597d\u7684\u6548\u679c, \u53ef\u4ee5\u52a0\u5165\u4e00\u4e9b\u5b9e\u65f6\u7684\u5168\u5c40\u5149\u7167\u7b97\u6cd5, \u5982Dynamic Ambient Occlusion\u4e4b\u7c7b...\u9634\u5f71\u540c\u7406...<\/p>\n

           <\/p>\n","protected":false},"excerpt":{"rendered":"

          \u4ec0\u4e48\u662f\u70d8\u7119? \u7b80\u5355\u5730\u8bf4, \u5c31\u662f\u628a\u7269\u4f53\u5149\u7167\u7684\u660e\u6697\u4fe1\u606f\u4fdd\u5b58\u5230\u7eb9\u7406\u4e0a, \u5b9e\u65f6\u7ed8\u5236\u65f6\u4e0d\u518d\u8fdb\u884c\u5149\u7167\u8ba1\u7b97, \u800c\u662f\u91c7\u7528\u9884\u5148\u751f … \u7ee7\u7eed\u9605\u8bfb\u201c\u5feb\u901fLightMap\u70d8\u7119\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":[85],"class_list":["post-190","post","type-post","status-publish","format-standard","hentry","category-16","tag-lightmap-"],"_links":{"self":[{"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=\/wp\/v2\/posts\/190","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=190"}],"version-history":[{"count":0,"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=\/wp\/v2\/posts\/190\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=190"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=190"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.keyboardmeow.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=190"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}