{"id":3628,"date":"2018-01-21T23:12:58","date_gmt":"2018-01-21T15:12:58","guid":{"rendered":"http:\/\/www.bookcard.net\/wordpress\/?p=3628"},"modified":"2018-10-14T21:24:08","modified_gmt":"2018-10-14T13:24:08","slug":"opengl_spotlight","status":"publish","type":"post","link":"https:\/\/www.bookcard.net\/wordpress\/opengl_spotlight\/","title":{"rendered":"OpenGL\u4e4b\u805a\u5149\u71c8"},"content":{"rendered":"
\"\"<\/a>
OpenGL\u4e4b\u805a\u5149\u71c8<\/figcaption><\/figure>\n

\u805a\u5149\u71c8:\u5728\u5b9a\u9ede\u5149\u6e90<\/a>\u7684\u57fa\u790e\u52a0\u4e0a\u5149\u7dda\u8f3b\u5c04\u65b9\u5411,\u56e0\u6b64\u5149\u7dda\u5448\u5713\u9310.<\/p>\n\n\n\n\n\n\n
\u805a\u5149\u71c8\u53c3\u6578<\/td>\n\u7bc4\u570d<\/td>\n\u7c21\u4ecb<\/td>\n<\/tr>\n
GL_SPOT_DIRECTION<\/td>\n(x,y,z)<\/td>\n\u805a\u5149\u71c8\u6307\u5411\/\u65b9\u54113D\u77e2\u91cf<\/p>\n

\u9ed8\u8a8d\u503c:(0,0,-1)<\/td>\n<\/tr>\n

GL_SPOT_EXPONENT<\/td>\n0-128<\/td>\n\u7126\u9ede\/\u6307\u6578:\u5149\u7dda\u5f9e\u7126\u9ede\u5230\u5713\u9310\u7684\u908a\u754c,\u5149\u7684\u5f37\u5ea6\u4e0d\u65b7\u8870\u6e1b,\u76f4\u5230\u908a\u754c\u6d88\u5931.<\/p>\n

\u6307\u6578\u8d8a\u5927\u7126\u9ede\u8d8a\u5c0f<\/p>\n

\u6307\u6578\u8d8a\u5c0f\u7126\u9ede\u8d8a\u5927<\/td>\n<\/tr>\n

GL_SPOT_CUTOFF<\/td>\n0.1-90<\/td>\n\u5713\u9310\u9762\u8207\u6307\u5411\u8ef8\u7684\u89d2\u5ea6(\u5713\u9310\u89d2),\u6240\u4ee5\u805a\u5149\u71c8\u7684\u5f35\u89d2\u70ba\u5713\u9310\u89d2\u76842\u500d.<\/p>\n

\u5f35\u89d2=\u5713\u9310\u89d2*2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u805a\u5149\u71c8\u51fd\u5f0f\u4f7f\u7528\u793a\u4f8b<\/p>\n

    \n
  1. float Spot_Direction[] = {0f,0.0f,-1,0.0f}; \/\/ \u805a\u5149\u71c8\u7684\u6307\u5411<\/li>\n
  2. float Light_Ambient[] = {0f,1.0f,1.0f,1.0f};\/\/ \u74b0\u5883\u5149<\/li>\n
  3. float Light_Diffuse[] = {0f,1.0f,1.0f,1.0f};\/\/ \u6563\u5c04\u5149<\/li>\n
  4. float Light_Position[] = {0f,0.0f,1.0f,1.0f};\/\/ \u5149\u6e90\u4f4d\u7f6e<\/li>\n
  5. glEnable(GL_LIGHTING); \/\/ \u555f\u7528\u5149\u7167<\/li>\n
  6. glLightfv(light,GL_AMBIENT, Light_Ambient);\/\/ \u74b0\u5883\u5149\u5206\u91cf<\/li>\n
  7. glLightfv(light,GL_DIFFUSE, Light_Diffuse);\/\/ \u6563\u5c04\u5149\u5206\u91cf<\/li>\n
  8. glLightfv(light,GL_POSITION,Light_Position);\/\/ \u5149\u6e90\u4f4d\u7f6e<\/li>\n
  9. glLightf(GL_LIGHT0, GL_SPOT_CUTOFF, 0f); \/\/ \u8a2d\u7f6e\u805a\u5149\u71c8\u7684\u89d2\u5ea6<\/li>\n
  10. glLightfv(GL_LIGHT0,GL_SPOT_DIRECTION, Spot_Direction); \/\/ \u8a2d\u7f6e\u805a\u5149\u71c8\u7684<\/li>\n
  11. glLightf(GL_LIGHT0, GL_SPOT_EXPONENT, 0f); \/\/ \u8a2d\u7f6e\u805a\u5149\u71c8\u7684\u6307\u6578<\/li>\n
  12. glEnable(GL_LIGHT0); \/\/ \u555f\u7528\u71c8\u5149<\/li>\n<\/ol>\n

    \u805a\u5149\u71c8\u7a0b\u5f0f\u793a\u4f8b,\u53ef\u5206\u5225\u8a2d\u5b9a\u5f35\u89d2\u8207\u7126\u9ede.\u4e0b\u8f09<\/a><\/p>\n

      \n
    1. \u6309(\/)\u9375\u589e\u52a0\u6216\u6e1b\u5c0f\u805a\u5149\u71c8\u7126\u9ede\u6307\u6578<\/li>\n
    2. \u6309[\/]\u9375\u589e\u52a0\u6216\u6e1b\u5c0f\u805a\u5149\u71c8\u5f35\u89d2<\/li>\n
    3. \u6309+\/-\u9375\u589e\u52a0\u6216\u6e1b\u5c0f\u805a\u5149\u71c8\u4eae\u5ea6<\/li>\n
    4. \u6309SPACE(\u7a7a\u683c)\u9375\u555f\u7528\u6216\u7981\u7528\u805a\u5149\u71c8<\/li>\n
    5. \u6309UP\/DOWN\u9375\u6b63\u65b9\u9ad4\u7e5eX\u8ef8\u65cb\u8f49<\/li>\n
    6. \u6309LEFT\/RIGHT\u9375\u6b63\u65b9\u9ad4\u7e5eY\u8ef8\u65cb\u8f49<\/li>\n
    7. \u6309F1\u9375\u6253\u958b\u5e6b\u52a9<\/li>\n
    8. \u6309ESC\u9375\u91cd\u7f6e\u805a\u5149\u71c8\u53c3\u6578<\/li>\n<\/ol>\n

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

      \u805a\u5149\u71c8:\u5728\u5b9a\u9ede\u5149\u6e90\u7684\u57fa\u790e\u52a0\u4e0a\u5149\u7dda\u8f3b\u5c04\u65b9\u5411,\u56e0\u6b64\u5149\u7dda\u5448\u5713\u9310. \u805a\u5149\u71c8\u53c3\u6578 \u7bc4\u570d \u7c21\u4ecb GL_SPOT_DIREC … <\/p>\n

      \u7e7c\u7e8c\u95b1\u8b80 OpenGL\u4e4b\u805a\u5149\u71c8<\/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":[62],"tags":[50],"class_list":["post-3628","post","type-post","status-publish","format-standard","hentry","category-opengl","tag-opengl","entry"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3628","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/comments?post=3628"}],"version-history":[{"count":2,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3628\/revisions"}],"predecessor-version":[{"id":3632,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3628\/revisions\/3632"}],"wp:attachment":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/media?parent=3628"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/categories?post=3628"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/tags?post=3628"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}