{"id":3591,"date":"2018-01-15T21:41:56","date_gmt":"2018-01-15T13:41:56","guid":{"rendered":"http:\/\/www.bookcard.net\/wordpress\/?p=3591"},"modified":"2018-10-14T21:30:12","modified_gmt":"2018-10-14T13:30:12","slug":"opengl_lookat","status":"publish","type":"post","link":"https:\/\/www.bookcard.net\/wordpress\/opengl_lookat\/","title":{"rendered":"OpenGL\u4e4b\u76f8\u6a5f gluLookAt()"},"content":{"rendered":"
\"\"<\/a>
OpenGL\u4e4b\u76f8\u6a5f gluLookAt()<\/figcaption><\/figure>\n

\u51fd\u5f0fgluLookAt()\u5141\u8a31\u4f60\u8a2d\u5b9a\u76f8\u6a5f\u7684\u4f4d\u7f6e\u3001\u65b9\u5411\u3001\u671d\u4e0a\u5411\u91cf<\/p>\n

\u76f8\u6a5f\u8a2d\u5b9a\u793a\u4f8b:<\/p>\n

    \n
  1. glMatrixMode(GL_MODELVIEW);\u8a2d\u5b9a\u6a21\u578b\u8996\u5716\u77e9\u9663<\/li>\n
  2. glLoadIdentity()\u5c07\u89c0\u5bdf\u77e9\u9663\u8f09\u5165\u55ae\u4f4d\u77e9\u9663,\u76f8\u6a5f\u70ba\u65bc\u539f\u9ede,\u671d\u5411\u70ba\u8ca0Z\u8ef8,\u4e0a\u65b9\u5411\u91cf\u70ba\u6b63Y\u8ef8.<\/li>\n
  3. gluLookAt() \u76f8\u5c0d\u4e8e\u539f\u9ede\u5728\u79fb\u52d5\u76f8\u6a5f<\/li>\n<\/ol>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    \u51fd\u5f0f<\/td>\n\u6578\u503c<\/td>\n\u7c21\u4ecb<\/td>\n<\/tr>\n
    void gluLookAt (<\/td>\n <\/td>\n <\/td>\n<\/tr>\n
    GLdouble eyex,<\/td>\n0.0f,0.0f,0.0f,<\/td>\n\u76f8\u6a5f\u4f4d\u7f6e\u8a2d\u70ba\u539f\u9ede<\/td>\n<\/tr>\n
    GLdouble eyey,<\/td>\n<\/tr>\n
    GLdouble eyez,<\/td>\n<\/tr>\n
    GLdouble centerx,<\/td>\n0.0f,0.0f,-100.0f,<\/td>\n\u76f8\u6a5f\u671d\u5411\u8ca0Z\u8ef8<\/td>\n<\/tr>\n
    GLdouble centery,<\/td>\n<\/tr>\n
    GLdouble centerz,<\/td>\n<\/tr>\n
    GLdouble upx,<\/td>\n0.0f,1.0f,0.0f<\/td>\n\u4e0a\u65b9\u5411\u91cf\u70ba\u6b63Y\u8ef8<\/td>\n<\/tr>\n
    GLdouble upy,<\/td>\n<\/tr>\n
    GLdouble upz);<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

     <\/p>\n\n\n\n\n\n\n
    \u4f4d\u7f6e\u548c\u65b9\u5411\u8a08\u7b97<\/td>\n\u7c21\u4ecb<\/td>\n<\/tr>\n
    radians = 3.141592654f * angleA \/ 180.0f;<\/td>\nAngleA: Y\u8ef8\u89d2\u5ea6<\/p>\n

    Radians: \u5f27\u5ea6<\/td>\n<\/tr>\n

    pos=pos – (speed * cos(radians));<\/td>\nPos:\u76f8\u6a5f\u7684\u4f4d\u7f6e<\/p>\n

    Speed:\u79fb\u52d5\u901f\u5ea6<\/td>\n<\/tr>\n

    target=pos+dist*cos(radians);<\/td>\nDist:\u8996\u8ddd<\/p>\n

    Target:\u76f8\u6a5f\u7684\u671d\u5411<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u76f8\u6a5f\u79fb\u52d5\u7a0b\u5f0f\u6f14\u793a:\u4e0b\u8f09<\/a><\/p>\n

      \n
    1. \u6309UP\/DOWN\u9375\u524d\u5f8c\u79fb\u52d5<\/li>\n
    2. \u6309LEFT\/RIGHT\u9375\u5de6\u53f3\u65cb\u8f49<\/li>\n
    3. \u6309F1\u9375\u6253\u958b\u5e6b\u52a9<\/li>\n
    4. \u6309ESC\u9375\u76f8\u6a5f\u8fd4\u56de\u539f\u9ede<\/li>\n
    5. \u6309+\u9375\u52a0\u5927\u76f4\u7dda\u5bec\u5ea6<\/li>\n
    6. \u6309-\u9375\u6e1b\u5c0f\u76f4\u7dda\u5bec\u5ea6<\/li>\n
    7. \u6309S\u9375\u5207\u63db\u6297\u92f8\u9f52\u529f\u80fd<\/li>\n
    8. \u6309.\u9375\u5207\u63db\u56db\u908a\u5f62\u9ede\u756b\u6a21\u5f0f<\/li>\n
    9. \u63091\u9375\u5207\u63db\u70ba\u9ec3\u8272<\/li>\n
    10. \u63092\u9375\u5207\u63db\u70ba\u7da0\u8272<\/li>\n
    11. \u63093\u9375\u5207\u63db\u70ba\u7d05\u8272<\/li>\n
    12. \u63094\u9375\u586b\u5145\u6a21\u5f0f<\/li>\n
    13. \u63095\u9375\u7dda\u6846\u6a21\u5f0f<\/li>\n
    14. \u63096\u9375\u9802\u9ede\u6a21\u5f0f<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

      \u51fd\u5f0fgluLookAt()\u5141\u8a31\u4f60\u8a2d\u5b9a\u76f8\u6a5f\u7684\u4f4d\u7f6e\u3001\u65b9\u5411\u3001\u671d\u4e0a\u5411\u91cf \u76f8\u6a5f\u8a2d\u5b9a\u793a\u4f8b: glMatrixMode(GL … <\/p>\n

      \u7e7c\u7e8c\u95b1\u8b80 OpenGL\u4e4b\u76f8\u6a5f gluLookAt()<\/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-3591","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\/3591","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=3591"}],"version-history":[{"count":4,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3591\/revisions"}],"predecessor-version":[{"id":3597,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/3591\/revisions\/3597"}],"wp:attachment":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/media?parent=3591"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/categories?post=3591"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/tags?post=3591"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}