{"id":4069,"date":"2018-05-10T19:28:44","date_gmt":"2018-05-10T11:28:44","guid":{"rendered":"http:\/\/www.bookcard.net\/wordpress\/?p=4069"},"modified":"2018-10-14T21:12:58","modified_gmt":"2018-10-14T13:12:58","slug":"opengl_billboard","status":"publish","type":"post","link":"https:\/\/www.bookcard.net\/wordpress\/opengl_billboard\/","title":{"rendered":"OpenGL\u4e4b\u5ee3\u544a\u724c"},"content":{"rendered":"<figure id=\"attachment_4070\" aria-describedby=\"caption-attachment-4070\" style=\"width: 1024px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/www.bookcard.net\/wordpress\/wp-content\/uploads\/2018\/05\/OpenGL_Billboard.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-4070\" src=\"https:\/\/www.bookcard.net\/wordpress\/wp-content\/uploads\/2018\/05\/OpenGL_Billboard.jpg\" alt=\"\" width=\"1024\" height=\"768\" srcset=\"https:\/\/www.bookcard.net\/wordpress\/wp-content\/uploads\/2018\/05\/OpenGL_Billboard.jpg 1024w, https:\/\/www.bookcard.net\/wordpress\/wp-content\/uploads\/2018\/05\/OpenGL_Billboard-300x225.jpg 300w, https:\/\/www.bookcard.net\/wordpress\/wp-content\/uploads\/2018\/05\/OpenGL_Billboard-768x576.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption id=\"caption-attachment-4070\" class=\"wp-caption-text\">OpenGL\u4e4b\u5ee3\u544a\u724c<\/figcaption><\/figure>\n<p>\u7576\u6211\u5730\u5728\u6e38\u4e2d\u6e32\u67d3\u5927\u91cf3D\u6a21\u578b\u6642,\u5982\u679c3D\u6a21\u578b\u96e2\u8996\u53e3\u5f88\u9060\u6642,\u5728\u5c4f\u5e55\u4e0a\u7e6a\u756b\u53ef\u80fd\u53ea\u662f\u5e7e\u500b\u50cf\u7d20,\u5176\u4e2d\u89e3\u537b\u65b9\u6cd5\u662f3D\u6a21\u578b\u8f49\u70ba2D\u5716\u50cf,\u7136\u5f8c\u4f5c\u70ba\u7d0b\u7406\u6620\u5c04\u5230\u56db\u908a\u5f62.\u7576\u8996\u53e3\u9760\u8fd1\u6642\u518d\u5207\u63db\u70ba3D\u6a21\u578b.\u5ee3\u544a\u724c\u4f5c\u7528\u662f\u78ba\u4fdd2D\u5716\u50cf\u6b64\u7d42\u9762\u5411\u8996\u53e3.\u6f14\u793a\u7a0b\u5f0f\u4e2d\u6309\u524d\u5f8c\u9375\u79fb\u52d5\u76f8\u6a5f,\u6309\u5de6\u53f3\u9375\u65cb\u8f49\u76f8\u6a5f,\u4ed9\u4eba\u638c\u6b64\u7d42\u9762\u5411\u8996\u53e3:<a href=\"https:\/\/www.bookcard.net\/wordpress\/wp-content\/uploads\/2018\/05\/OpenGLBillboard.zip\">\u4e0b\u8f09<\/a><\/p>\n<p>1.\u7372\u53d6\u7576\u524d\u300e\u6a21\u578b\u8996\u5716\u77e9\u9663\u300f<\/p>\n<p>typedef struct MATRIX4X4_TYP{<\/p>\n<p>float M[4][4]; \/\/\u4ee5\u6578\u7d44\u5f62\u5f0f\u5132\u5b58<\/p>\n<p>} MATRIX4X4, *MATRIX4X4_PTR;<\/p>\n<p>glGetFloatv(GL_MODELVIEW_MATRIX, (float*)matrix.M);<\/p>\n<p>2.\u63d0\u53d6\u8996\u53e3\u53f3\u5247\u5411\u91cf<\/p>\n<p>VECTOR3D\u00a0 right;<\/p>\n<p>Init_VECTOR3D(&amp;right, matrix.M[0][0], matrix.M[1][0], matrix.M[2][0]);<\/p>\n<p>3.\u63d0\u53d6\u8996\u53e3\u53f3\u5247\u5411\u91cf<\/p>\n<p>VECTOR3D\u00a0 up;<\/p>\n<p>Init_VECTOR3D(&amp;up,matrix.M[0][1],matrix.M[1][1], matrix.M[2][1]);<\/p>\n<p>4.\u79fb\u52d5\u5ee3\u544a\u724c(\u56db\u908a\u5f62)\u4e2d\u5fc3\u4f4d\u7f6e<\/p>\n<p>glPushMatrix();<\/p>\n<p>glTranslatef(position-&gt;x, position-&gt;y, position-&gt;z);<\/p>\n<p>5.\u6e96\u5099\u7e6a\u756b\u5ee3\u544a\u724c(\u56db\u908a\u5f62)<\/p>\n<p>glBegin(GL_QUADS);<\/p>\n<p>6.\u6cd5\u7dda\u671d\u5411<\/p>\n<p>glNormal3f(0.0f, 0.0f, 1.0f);<\/p>\n<p>7.\u91cd\u65b0\u8a08\u7b97\u5ee3\u544a\u724c(\u56db\u908a\u5f62)\u9802\u9ede\u4f4d\u7f6e,\u4ee5\u5be6\u73fe\u5ee3\u544a\u724c\u6cd5\u7dda\u6b64\u7d42\u671d\u5411\u8996\u53e3<\/p>\n<p>VECTOR3D\u00a0 Vertex;<\/p>\n<p>glTexCoord2f(0.0f, 0.0f); glVertex3fv(((right + up) * -size).M); \/\/ \u5de6\u4e0a\u89d2<\/p>\n<p>glTexCoord2f(1.0f, 0.0f); glVertex3fv(((right &#8211; up) * size).M); \/\/ \u53f3\u4e0b\u89d2<\/p>\n<p>glTexCoord2f(1.0f, 1.0f); glVertex3fv(((right + up) * size).M); \/\/ \u53f3\u4e0a\u89d2<\/p>\n<p>glTexCoord2f(0.0f, 1.0f); glVertex3fv(((up &#8211; right) * size).M); \/\/ \u5de6\u4e0a\u89d2<\/p>\n<p>8.\u5b8c\u6210\u7e6a\u756b\u5ee3\u544a\u724c(\u56db\u908a\u5f62)<\/p>\n<p>glEnd();<\/p>\n<p>glPopMatrix();\/\/ \u5f48\u51fa\u77e9\u9663<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7576\u6211\u5730\u5728\u6e38\u4e2d\u6e32\u67d3\u5927\u91cf3D\u6a21\u578b\u6642,\u5982\u679c3D\u6a21\u578b\u96e2\u8996\u53e3\u5f88\u9060\u6642,\u5728\u5c4f\u5e55\u4e0a\u7e6a\u756b\u53ef\u80fd\u53ea\u662f\u5e7e\u500b\u50cf\u7d20,\u5176\u4e2d\u89e3\u537b\u65b9\u6cd5\u662f3D\u6a21\u578b &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.bookcard.net\/wordpress\/opengl_billboard\/\" class=\"more-link\">\u7e7c\u7e8c\u95b1\u8b80 <span class=\"screen-reader-text\">OpenGL\u4e4b\u5ee3\u544a\u724c<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62],"tags":[50],"class_list":["post-4069","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\/4069","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=4069"}],"version-history":[{"count":1,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/4069\/revisions"}],"predecessor-version":[{"id":4072,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/posts\/4069\/revisions\/4072"}],"wp:attachment":[{"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/media?parent=4069"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/categories?post=4069"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bookcard.net\/wordpress\/wp-json\/wp\/v2\/tags?post=4069"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}