{"id":373,"date":"2015-01-03T23:31:09","date_gmt":"2015-01-03T15:31:09","guid":{"rendered":"http:\/\/www.hightopo.com\/blog\/?p=373"},"modified":"2015-01-03T23:31:09","modified_gmt":"2015-01-03T15:31:09","slug":"%e7%ba%afshading-language%e7%bb%98%e5%88%b6%e9%a3%9e%e6%9c%ba%e7%81%ab%e7%84%b0%e6%95%88%e6%9e%9c","status":"publish","type":"post","link":"https:\/\/www.hightopo.com\/blog\/373.html","title":{"rendered":"\u7eafShading Language\u7ed8\u5236\u98de\u673a\u706b\u7130\u6548\u679c"},"content":{"rendered":"<p>\u4e0a\u7bc7\u300a<a href=\"http:\/\/www.hightopo.com\/blog\/363.html\">\u7eafShading Language\u7ed8\u5236HTML5\u65f6\u949f<\/a>\u300b\u4f53\u73b0\u4e86GLSL\u53ef\u7f16\u7a0b\u6027\u7279\u70b9\uff0c\u4f46\u6ca1\u6709\u4f53\u73b0GLSL\u53ef\u7f16\u7a0b\u51fa\u5404\u79cd\u9177\u70ab\u6548\u679c\u7684\u7279\u70b9\uff0c\u4eca\u5929\u6211\u4eec\u5c06\u7528\u7eafShading Language\u7ed8\u5236\u706b\u7130\u6548\u679c\uff0c\u5e76\u5c06\u5176\u5e94\u7528\u5230\u300a<a href=\"http:\/\/www.hightopo.com\/blog\/229.html\">HT\u56fe\u5f62\u7ec4\u4ef6\u8bbe\u8ba1\u4e4b\u9053\uff08\u56db\uff09<\/a>\u300b\u98de\u884c\u7684\u98de\u673a\u4f8b\u5b50\u4e0a\u3002<\/p>\n<p><a href=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.48.26-PM.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-374\" alt=\"Screen Shot 2015-01-01 at 8.48.26 PM\" src=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.48.26-PM.png\" width=\"1316\" height=\"648\" srcset=\"https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.48.26-PM.png 1316w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.48.26-PM-300x147.png 300w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.48.26-PM-1024x504.png 1024w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.48.26-PM-200x98.png 200w\" sizes=\"(max-width: 1316px) 100vw, 1316px\" \/><\/a><\/p>\n<p>\u706b\u7130\u7684\u4f8b\u5b50\u6211\u5df2\u53d1\u5728\u00a0<a href=\"http:\/\/js.do\/hightopo\/fireball\">http:\/\/js.do\/hightopo\/fireball<\/a>\uff0c\u5176\u672c\u8d28\u5728\u7ed8\u5236gl.POINTS\u7684\u70b9\u7c7b\u578b\u65f6\uff0c\u901a\u8fc7\u5728Fragment Shader\u5728\u70b9\u533a\u57df\u5185\u751f\u6210noise\u7684\u566a\u58f0\u7528\u4e8e\u7ed8\u5236\u591a\u79cd\u989c\u8272\u6548\u679c\uff0c\u5e76\u5c06\u591a\u6b21\u4e0d\u540c\u566a\u58f0\u7b97\u6cd5\u751f\u6210\u7684\u989c\u8272\u8fdb\u884c\u53e0\u52a0\uff0c\u540c\u65f6\u566a\u58f0\u7684\u751f\u6210\u8fd8\u4f9d\u8d56\u4e8etime\u7684\u65f6\u95f4\u53c2\u6570\uff0c\u8fd9\u6837\u6700\u7ec8\u878d\u5408\u6210\u4e0d\u9519\u7684\u5706\u5f62\u706b\u7130\u6548\u679c\u3002<\/p>\n<p>\u91c7\u7528gl.POINTS\u7684\u7ed8\u5236\u65b9\u5f0f\u4f1a\u53d7\u4e0d\u540c\u6d4f\u89c8\u5668\u5bf9\u70b9\u5927\u5c0f\u7684\u9650\u5236\uff0c\u53ef\u901a\u8fc7gl.getParameter(gl.ALIASED_POINT_SIZE_RANGE)\u83b7\u77e5\u6d4f\u89c8\u5668\u652f\u6301\u7684\u6700\u5c0f\u548c\u6700\u5927\u8303\u56f4\uff0c\u4e00\u822c\u4e5f\u90fd\u67091~255\u62161~300\u7684\u533a\u95f4\uff0c\u6240\u4ee5\u4e5f\u57fa\u672c\u591f\u7528\u4e8e\u5c55\u793a\u6548\u679c\uff0c<a href=\"http:\/\/js.do\/hightopo\/fireball\">http:\/\/js.do\/hightopo\/fireball<\/a>\u7684\u4f8b\u5b50\u4e2d52\u884c\u4e2d\u7684float color = 3.0 &#8211; (3.*length(2.*p));\u5176\u4e2d\u7684\u7b2c\u4e00\u4e2a3.0\u662f\u706b\u7130\u5f3a\u5ea6intensity\u53c2\u6570\uff0c\u53ef\u901a\u8fc7\u6539\u53d8\u6b64\u503c\u8fbe\u5230\u6539\u53d8\u706b\u7130\u5f3a\u5ea6\u7684\u6548\u679c\uff0c\u53ef\u57281.0~4.0\u8303\u56f4\u4f53\u9a8c\u4ece\u5c0f\u706b\u5230\u5927\u706b\u7684\u8c03\u8282\u6548\u679c\u3002<\/p>\n<p><a href=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.31.49-PM.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-376\" alt=\"Screen Shot 2015-01-01 at 8.31.49 PM\" src=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.31.49-PM.png\" width=\"818\" height=\"419\" srcset=\"https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.31.49-PM.png 818w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.31.49-PM-300x153.png 300w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.31.49-PM-200x102.png 200w\" sizes=\"(max-width: 818px) 100vw, 818px\" \/><\/a> <a href=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.32.42-PM.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-377\" alt=\"Screen Shot 2015-01-01 at 8.32.42 PM\" src=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.32.42-PM.png\" width=\"817\" height=\"416\" srcset=\"https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.32.42-PM.png 817w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.32.42-PM-300x152.png 300w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.32.42-PM-200x101.png 200w\" sizes=\"(max-width: 817px) 100vw, 817px\" \/><\/a><\/p>\n<p>\u300a<a href=\"http:\/\/www.hightopo.com\/blog\/229.html\">HT\u56fe\u5f62\u7ec4\u4ef6\u8bbe\u8ba1\u4e4b\u9053\uff08\u56db\uff09<\/a>\u300b\u6587\u4e2d\u7684\u4f8b\u5b50\u6211\u5c06\u5728\u98de\u673a\u7684\u5c3e\u90e8\u53e0\u52a0\u8be5\u706b\u7130\u6548\u679c\uff0c\u7531\u4e8e\u8003\u8651\u5230\u81ea\u5b9a\u4e49GLSL\u7684\u590d\u6742\u6027\uff0c<a href=\"http:\/\/www.hightopo.com\/\">HT<\/a>\u5e76\u672a\u5f00\u653e\u56fe\u5143\u81ea\u5b9a\u4e49GLSL\u7684\u529f\u80fd\uff0c\u6211\u4eec\u5c06\u8981\u91c7\u7528\u7684\u662f\u5728Graph3dView\u7684\u4e0a\u5c42\u518d\u6b21\u53e0\u52a0\u4e00\u4e2aWebGL\u9a71\u52a8\u7684Canvas\uff0c\u706b\u7130\u662f\u7ed8\u5236\u5230\u8fd9\u4e2a\u4e0a\u5c42\u7684Canvas\uff0c\u56e0\u6b64\u548cHT\u7684Graph3dView\u5b8c\u5168\u662f\u677e\u8026\u5408\uff0c\u4e0d\u4f1a\u5f71\u54cdHT\u76843D\u7ec4\u4ef6\u81ea\u8eab\u7684\u6240\u6709\u663e\u793a\u548c\u4ea4\u4e92\u529f\u80fd\uff0c\u8fd9\u6837\u7684\u5e94\u7528\u6709\u70b9\u7c7b\u4f3c\u300a<a href=\"http:\/\/www.hightopo.com\/blog\/316.html\">\u767e\u5ea6\u5730\u56fe\u4e0eHT for Web\u7ed3\u5408\u7684GIS\u7f51\u7edc\u62d3\u6251\u5e94\u7528<\/a>\u300b\u4e2dGIS\u5730\u56fe\u4e0eHT\u7684GraphView\u7ec4\u4ef6\u53e0\u52a0\u6548\u679c\u3002<\/p>\n<p><a href=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/10\/Screen-Shot-2014-10-08-at-7.45.25-PM.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-230\" alt=\"Screen Shot 2014-10-08 at 7.45.25 PM\" src=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/10\/Screen-Shot-2014-10-08-at-7.45.25-PM.png\" width=\"774\" height=\"436\" srcset=\"https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/10\/Screen-Shot-2014-10-08-at-7.45.25-PM.png 774w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/10\/Screen-Shot-2014-10-08-at-7.45.25-PM-300x168.png 300w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/10\/Screen-Shot-2014-10-08-at-7.45.25-PM-200x112.png 200w\" sizes=\"(max-width: 774px) 100vw, 774px\" \/><\/a><\/p>\n<p>\u5f53\u7136\u8fd9\u6837\u53e0\u52a0\u4f1a\u5bfc\u81f4\u706b\u7130\u59cb\u7ec8\u5728\u6700\u4e0a\u5c42\uff0c\u65e0\u6cd5\u771f\u5b9e\u53cd\u6620\u4e09\u7ef4\u7a7a\u95f4\u5c42\u6b21\u7684\u95ee\u9898\uff0c\u4f46\u4f5c\u4e3a\u76d1\u63a7\u7cfb\u7edf\u5e94\u7528\u6700\u5173\u952e\u7684\u662f\u5c55\u793a\u91cd\u8981\u6307\u6807\uff0c\u4f8b\u5982\u5bf9\u4e8e\u7535\u4fe1\u7f51\u7ba1\u5e94\u7528\uff0c\u5f53\u8bbe\u5907\u6709\u544a\u8b66\u5192\u6ce1\u5448\u73b0\u65f6\uff0c\u5f80\u5f80\u8981\u6c42\u544a\u8b66\u5192\u6ce1\u8981\u5448\u73b0\u5728\u6700\u4e0a\u5c42\u4e0d\u8981\u88ab\u5176\u4ed6\u8bbe\u5907\u906e\u6321\u4f4f\uff0c\u540c\u6837\u5982\u679c\u771f\u7684\u98de\u673a\u5931\u706b\u9700\u8981\u76d1\u63a7\u7cfb\u7edf\u5b9e\u65f6\u63d0\u793a\u8be5\u544a\u8b66\u4fe1\u606f\u65f6\uff0c\u80af\u5b9a\u4e5f\u662f\u9700\u8981\u8be5\u706b\u7130\u4e0d\u88ab\u906e\u6321\uff0c\u56e0\u6b64\u771f\u5b9e\u4e16\u754c\u7684\u5c42\u6b21\u7455\u75b5\u5728\u8fd9\u91cc\u53cd\u800c\u662f\u5408\u9002\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<p><a href=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-03-at-10.45.06-PM.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-378\" alt=\"Screen Shot 2015-01-03 at 10.45.06 PM\" src=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-03-at-10.45.06-PM.png\" width=\"940\" height=\"628\" srcset=\"https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-03-at-10.45.06-PM.png 940w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-03-at-10.45.06-PM-300x200.png 300w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-03-at-10.45.06-PM-200x133.png 200w\" sizes=\"(max-width: 940px) 100vw, 940px\" \/><\/a><\/p>\n<p>\u53e0\u52a0Canvas\u5230Graph3dView\u6bd4\u8f83\u5bb9\u6613\uff0c\u901a\u8fc7Graph3dView.getView().appendChild(canvas)\u52a0\u5165\uff0c\u5e76\u5728Graph3dView\u5e03\u5c40\u65f6\u540c\u65f6\u5e03\u5c40Cavnas\u4f4d\u7f6e\u5927\u5c0f\uff0c\u706b\u7130\u7684\u4f4d\u7f6e\u6211\u4eec\u662f\u8fd9\u6837\u5b9e\u73b0\u7684\uff0c\u5c06\u4e00\u4e2a\u9690\u85cf\u7684node\u8282\u70b9host\u5230\u98de\u673a\u7684\u5c3e\u90e8\uff0c\u8fd9\u6837\u8be5\u8282\u70b9\u4f1a\u81ea\u5b9a\u8ddf\u968f\u98de\u673a\u98de\u884c\u8fc7\u7a0b\u7684\u4f4d\u7f6e\u53d8\u5316\uff0c\u7ed8\u5236\u65f6\u706b\u7130\u65f6\u6211\u4eec\u901a\u8fc7Graph3dView#toViewPosition\u51fd\u6570\u5c06node\u4e09\u7ef4\u5750\u6807\u8f6c\u6362\u6210\u4e8c\u7ef4\u7684\u5c4f\u5e55Cavnas\u7684\u5750\u6807\uff0c\u8fd9\u8fd8\u6ca1\u5b8c\u6211\u4eec\u8fd8\u5f97\u5c06\u5c4f\u5e55\u5750\u6807\u8f6c\u6362\u6210WebGL\u9a71\u52a8\u7684Canvas\u7684POINT\u70b9\u5750\u6807\uff0c\u76f8\u5173\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush:javascript\">function draw(){\r\n\tgl.viewport(0, 0, canvas.width, canvas.height);\r\n\tgl.clearColor(0.0, 0.0, 0.0, 0.0);\r\n\tgl.clear(gl.COLOR_BUFFER_BIT);     \r\n\r\n\tgl.uniform1f(gl.getUniformLocation(program, 'time'), (Date.now() - startTime)\/1000 ); \r\n\tgl.uniform1f(gl.getUniformLocation(program, 'intensity'), intensity ); \r\n\r\n\tvar vertexBuffer = gl.createBuffer();\r\n\tgl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);\r\n\r\n\tvar position = g3d.toViewPosition(node.p3());                                \r\n\tgl.bufferData(gl.ARRAY_BUFFER, new Float32Array([\r\n\t\t position.x\/g3d.getWidth()*2 - 1,\r\n\t\t 1 - position.y\/g3d.getHeight()*2\r\n\t]), gl.STATIC_DRAW);\r\n\tvar vertexLocation = gl.getAttribLocation(program, \"aVertexPosition\");\r\n\tgl.vertexAttribPointer(vertexLocation, 2, gl.FLOAT, false, 0, 0);\r\n\tgl.enableVertexAttribArray(vertexLocation);                   \r\n\tgl.drawArrays(gl.POINTS, 0, 1);\r\n\r\n\trequestAnimationFrame(draw); \r\n}              \r\n\r\nfunction resizeCanvas(){\r\n\tcanvas.width = g3d.getWidth() * devicePixelRatio;\r\n\tcanvas.style.width = g3d.getWidth() + 'px';  \r\n\tcanvas.height = g3d.getHeight() * devicePixelRatio;\r\n\tcanvas.style.height = g3d.getHeight() + 'px';                 \r\n}<\/pre>\n<p>\u4ee5\u4e0a\u4ee3\u7801\u6211\u4eec\u8fd8\u4f20\u5165\u4e86intensity\u7684\u5f3a\u5ea6\u53c2\u6570\uff0c\u8be5\u53c2\u6570\u6211\u4eec\u901a\u8fc7ht.Default.startAnim\u52a8\u753b\u51fd\u6570\uff0c\u63a7\u5236\u5176\u503c\u57280~4\u4e4b\u95f4\u4e0d\u65ad\u6765\u56de\u53d8\u5316\uff0c\u8fd9\u6837\u53ef\u8fbe\u5230\u706b\u7130\u6709\u5c0f\u53d8\u5927\u6765\u56de\u53d8\u6362\u7684\u7c7b\u4f3c\u544a\u8b66\u95ea\u70c1\u63d0\u793a\u6548\u679c\u3002\u8fd8\u6709var devicePixelRatio = window.devicePixelRatio;\u53c2\u6570\u4e5f\u662f\u5bb9\u6613\u88ab\u5ffd\u7565\u7684\u7ec6\u8282\uff0c\u8be5\u503c\u4f1a\u6839\u636e\u8bbe\u5907\u7684retina\u652f\u6301\u7a0b\u5ea6\u6709\u4e0d\u540c\u7684\u503c\uff0c\u907f\u514d\u5728\u9ad8\u5206\u8fa8\u7387\u8bbe\u5907\u4e0b\u51fa\u73b0\u952f\u9f7f\u6a21\u7cca\u7684\u95ee\u9898\uff0c\u5f53\u7136\u901a\u8fc7devicePixelRatio\u589e\u5927canvas.width\u548ccanvas.height\u4e5f\u662f\u6709\u5185\u5b58\u7ed8\u5236\u6027\u80fd\u4ee3\u4ef7\u7684\uff0c\u5982\u679c\u6548\u679c\u8981\u6c42\u4e0d\u662f\u592a\u9ad8\u60c5\u51b5\u4e0b\u4e5f\u53ef\u4ee5\u90fd\u91c7\u75281\u6765\u5904\u7406\uff0c\u5176\u5b9e\u8981\u6c42\u4e0d\u592a\u9ad8\u7684\u4e09\u7ef4\u573a\u666f\u5373\u4f7f\u65f6retina\u4e3a3\u7684iphone 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href=\"http:\/\/v.youku.com\/v_show\/id_XODYyMzU3MDg0.html\">http:\/\/v.youku.com\/v_show\/id_XODYyMzU3MDg0.html<\/a>\uff09\uff0c\u5f53\u7136\u8fd8\u6709\u65e0\u6570\u7684\u7ec6\u8282\u53ef\u4ee5\u5b8c\u5584\uff0c\u4f8b\u5982\u53ef\u4ee5\u6839\u636e\u98de\u673a\u79bbeye\u7684\u8ddd\u79bb\u52a8\u6001\u6539\u53d8POINT\u70b9\u7684\u5927\u5c0f\uff0c\u6216\u6539\u9020GLSL\u5b9e\u73b0\u70df\u96fe\u7684\u7c92\u5b50\u7cfb\u7edf\u6548\u679c\u7b49\u7b49\uff0c\u4f46\u5143\u65e6\u5047\u671f\u7ed3\u675f\u4e86\u6211\u660e\u5929\u8fd8\u8981\u4e0a\u73ed\uff0c\u5176\u4ed6\u53ef\u5b8c\u5584\u7684\u5730\u65b9\u7559\u7ed9\u8bfb\u8005\u53bb\u60f3\u8c61\u4e86\u3002<\/p>\n<p><a href=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-03-at-11.18.30-PM.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-379\" alt=\"Screen Shot 2015-01-03 at 11.18.30 PM\" src=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-03-at-11.18.30-PM.png\" width=\"574\" height=\"619\" srcset=\"https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-03-at-11.18.30-PM.png 574w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-03-at-11.18.30-PM-278x300.png 278w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-03-at-11.18.30-PM-185x200.png 185w\" sizes=\"(max-width: 574px) 100vw, 574px\" \/><\/a><br \/>\n<iframe loading=\"lazy\" src=\"http:\/\/player.youku.com\/embed\/XODYyMzU3MDg0\" height=\"498\" width=\"510\" allowfullscreen=\"\" frameborder=\"0\"><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e0a\u7bc7\u300a<a href=\"http:\/\/www.hightopo.com\/blog\/363.html\">\u7eafShading Language\u7ed8\u5236HTML5\u65f6\u949f<\/a>\u300b\u4f53\u73b0\u4e86GLSL\u53ef\u7f16\u7a0b\u6027\u7279\u70b9\uff0c\u4f46\u6ca1\u6709\u4f53\u73b0GLSL\u53ef\u7f16\u7a0b\u51fa\u5404\u79cd\u9177\u70ab\u6548\u679c\u7684\u7279\u70b9\uff0c\u4eca\u5929\u6211\u4eec\u5c06\u7528\u7eafShading Language\u7ed8\u5236\u706b\u7130\u6548\u679c\uff0c\u5e76\u5c06\u5176\u5e94\u7528\u5230\u300a<a href=\"http:\/\/www.hightopo.com\/blog\/229.html\">HT\u56fe\u5f62\u7ec4\u4ef6\u8bbe\u8ba1\u4e4b\u9053\uff08\u56db\uff09<\/a>\u300b\u98de\u884c\u7684\u98de\u673a\u4f8b\u5b50\u4e0a\u3002<\/p>\n<p><a href=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.48.26-PM.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-374\" alt=\"Screen Shot 2015-01-01 at 8.48.26 PM\" src=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.48.26-PM.png\" width=\"1316\" height=\"648\" srcset=\"https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.48.26-PM.png 1316w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.48.26-PM-300x147.png 300w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.48.26-PM-1024x504.png 1024w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.48.26-PM-200x98.png 200w\" sizes=\"(max-width: 1316px) 100vw, 1316px\" \/><\/a><\/p>\n<p>\u706b\u7130\u7684\u4f8b\u5b50\u6211\u5df2\u53d1\u5728\u00a0<a href=\"http:\/\/js.do\/hightopo\/fireball\">http:\/\/js.do\/hightopo\/fireball<\/a>\uff0c\u5176\u672c\u8d28\u5728\u7ed8\u5236gl.POINTS\u7684\u70b9\u7c7b\u578b\u65f6\uff0c\u901a\u8fc7\u5728Fragment Shader\u5728\u70b9\u533a\u57df\u5185\u751f\u6210noise\u7684\u566a\u58f0\u7528\u4e8e\u7ed8\u5236\u591a\u79cd\u989c\u8272\u6548\u679c\uff0c\u5e76\u5c06\u591a\u6b21\u4e0d\u540c\u566a\u58f0\u7b97\u6cd5\u751f\u6210\u7684\u989c\u8272\u8fdb\u884c\u53e0\u52a0\uff0c\u540c\u65f6\u566a\u58f0\u7684\u751f\u6210\u8fd8\u4f9d\u8d56\u4e8etime\u7684\u65f6\u95f4\u53c2\u6570\uff0c\u8fd9\u6837\u6700\u7ec8\u878d\u5408\u6210\u4e0d\u9519\u7684\u5706\u5f62\u706b\u7130\u6548\u679c\u3002<\/p>\n<p>\u91c7\u7528gl.POINTS\u7684\u7ed8\u5236\u65b9\u5f0f\u4f1a\u53d7\u4e0d\u540c\u6d4f\u89c8\u5668\u5bf9\u70b9\u5927\u5c0f\u7684\u9650\u5236\uff0c\u53ef\u901a\u8fc7gl.getParameter(gl.ALIASED_POINT_SIZE_RANGE)\u83b7\u77e5\u6d4f\u89c8\u5668\u652f\u6301\u7684\u6700\u5c0f\u548c\u6700\u5927\u8303\u56f4\uff0c\u4e00\u822c\u4e5f\u90fd\u67091~255\u62161~300\u7684\u533a\u95f4\uff0c\u6240\u4ee5\u4e5f\u57fa\u672c\u591f\u7528\u4e8e\u5c55\u793a\u6548\u679c\uff0c<a href=\"http:\/\/js.do\/hightopo\/fireball\">http:\/\/js.do\/hightopo\/fireball<\/a>\u7684\u4f8b\u5b50\u4e2d52\u884c\u4e2d\u7684float color = 3.0 &#8211; (3.*length(2.*p));\u5176\u4e2d\u7684\u7b2c\u4e00\u4e2a3.0\u662f\u706b\u7130\u5f3a\u5ea6intensity\u53c2\u6570\uff0c\u53ef\u901a\u8fc7\u6539\u53d8\u6b64\u503c\u8fbe\u5230\u6539\u53d8\u706b\u7130\u5f3a\u5ea6\u7684\u6548\u679c\uff0c\u53ef\u57281.0~4.0\u8303\u56f4\u4f53\u9a8c\u4ece\u5c0f\u706b\u5230\u5927\u706b\u7684\u8c03\u8282\u6548\u679c\u3002<\/p>\n<p><a href=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.31.49-PM.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-376\" alt=\"Screen Shot 2015-01-01 at 8.31.49 PM\" src=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.31.49-PM.png\" width=\"818\" height=\"419\" srcset=\"https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.31.49-PM.png 818w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.31.49-PM-300x153.png 300w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.31.49-PM-200x102.png 200w\" sizes=\"(max-width: 818px) 100vw, 818px\" \/><\/a> <a href=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.32.42-PM.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-377\" alt=\"Screen Shot 2015-01-01 at 8.32.42 PM\" src=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.32.42-PM.png\" width=\"817\" height=\"416\" srcset=\"https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.32.42-PM.png 817w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.32.42-PM-300x152.png 300w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-01-at-8.32.42-PM-200x101.png 200w\" sizes=\"(max-width: 817px) 100vw, 817px\" \/><\/a><\/p>\n<p>\u300a<a href=\"http:\/\/www.hightopo.com\/blog\/229.html\">HT\u56fe\u5f62\u7ec4\u4ef6\u8bbe\u8ba1\u4e4b\u9053\uff08\u56db\uff09<\/a>\u300b\u6587\u4e2d\u7684\u4f8b\u5b50\u6211\u5c06\u5728\u98de\u673a\u7684\u5c3e\u90e8\u53e0\u52a0\u8be5\u706b\u7130\u6548\u679c\uff0c\u7531\u4e8e\u8003\u8651\u5230\u81ea\u5b9a\u4e49GLSL\u7684\u590d\u6742\u6027\uff0c<a href=\"http:\/\/www.hightopo.com\/\">HT<\/a>\u5e76\u672a\u5f00\u653e\u56fe\u5143\u81ea\u5b9a\u4e49GLSL\u7684\u529f\u80fd\uff0c\u6211\u4eec\u5c06\u8981\u91c7\u7528\u7684\u662f\u5728Graph3dView\u7684\u4e0a\u5c42\u518d\u6b21\u53e0\u52a0\u4e00\u4e2aWebGL\u9a71\u52a8\u7684Canvas\uff0c\u706b\u7130\u662f\u7ed8\u5236\u5230\u8fd9\u4e2a\u4e0a\u5c42\u7684Canvas\uff0c\u56e0\u6b64\u548cHT\u7684Graph3dView\u5b8c\u5168\u662f\u677e\u8026\u5408\uff0c\u4e0d\u4f1a\u5f71\u54cdHT\u76843D\u7ec4\u4ef6\u81ea\u8eab\u7684\u6240\u6709\u663e\u793a\u548c\u4ea4\u4e92\u529f\u80fd\uff0c\u8fd9\u6837\u7684\u5e94\u7528\u6709\u70b9\u7c7b\u4f3c\u300a<a href=\"http:\/\/www.hightopo.com\/blog\/316.html\">\u767e\u5ea6\u5730\u56fe\u4e0eHT for Web\u7ed3\u5408\u7684GIS\u7f51\u7edc\u62d3\u6251\u5e94\u7528<\/a>\u300b\u4e2dGIS\u5730\u56fe\u4e0eHT\u7684GraphView\u7ec4\u4ef6\u53e0\u52a0\u6548\u679c\u3002<\/p>\n<p><a href=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/10\/Screen-Shot-2014-10-08-at-7.45.25-PM.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-230\" alt=\"Screen Shot 2014-10-08 at 7.45.25 PM\" src=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/10\/Screen-Shot-2014-10-08-at-7.45.25-PM.png\" width=\"774\" height=\"436\" srcset=\"https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/10\/Screen-Shot-2014-10-08-at-7.45.25-PM.png 774w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/10\/Screen-Shot-2014-10-08-at-7.45.25-PM-300x168.png 300w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2014\/10\/Screen-Shot-2014-10-08-at-7.45.25-PM-200x112.png 200w\" sizes=\"(max-width: 774px) 100vw, 774px\" \/><\/a><\/p>\n<p>\u5f53\u7136\u8fd9\u6837\u53e0\u52a0\u4f1a\u5bfc\u81f4\u706b\u7130\u59cb\u7ec8\u5728\u6700\u4e0a\u5c42\uff0c\u65e0\u6cd5\u771f\u5b9e\u53cd\u6620\u4e09\u7ef4\u7a7a\u95f4\u5c42\u6b21\u7684\u95ee\u9898\uff0c\u4f46\u4f5c\u4e3a\u76d1\u63a7\u7cfb\u7edf\u5e94\u7528\u6700\u5173\u952e\u7684\u662f\u5c55\u793a\u91cd\u8981\u6307\u6807\uff0c\u4f8b\u5982\u5bf9\u4e8e\u7535\u4fe1\u7f51\u7ba1\u5e94\u7528\uff0c\u5f53\u8bbe\u5907\u6709\u544a\u8b66\u5192\u6ce1\u5448\u73b0\u65f6\uff0c\u5f80\u5f80\u8981\u6c42\u544a\u8b66\u5192\u6ce1\u8981\u5448\u73b0\u5728\u6700\u4e0a\u5c42\u4e0d\u8981\u88ab\u5176\u4ed6\u8bbe\u5907\u906e\u6321\u4f4f\uff0c\u540c\u6837\u5982\u679c\u771f\u7684\u98de\u673a\u5931\u706b\u9700\u8981\u76d1\u63a7\u7cfb\u7edf\u5b9e\u65f6\u63d0\u793a\u8be5\u544a\u8b66\u4fe1\u606f\u65f6\uff0c\u80af\u5b9a\u4e5f\u662f\u9700\u8981\u8be5\u706b\u7130\u4e0d\u88ab\u906e\u6321\uff0c\u56e0\u6b64\u771f\u5b9e\u4e16\u754c\u7684\u5c42\u6b21\u7455\u75b5\u5728\u8fd9\u91cc\u53cd\u800c\u662f\u5408\u9002\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<p><a href=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-03-at-10.45.06-PM.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-378\" alt=\"Screen Shot 2015-01-03 at 10.45.06 PM\" src=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-03-at-10.45.06-PM.png\" width=\"940\" height=\"628\" srcset=\"https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-03-at-10.45.06-PM.png 940w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-03-at-10.45.06-PM-300x200.png 300w, https:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-03-at-10.45.06-PM-200x133.png 200w\" sizes=\"(max-width: 940px) 100vw, 940px\" \/><\/a><\/p>\n<p>\u53e0\u52a0Canvas\u5230Graph3dView\u6bd4\u8f83\u5bb9\u6613\uff0c\u901a\u8fc7Graph3dView.getView().appendChild(canvas)\u52a0\u5165\uff0c\u5e76\u5728Graph3dView\u5e03\u5c40\u65f6\u540c\u65f6\u5e03\u5c40Cavnas\u4f4d\u7f6e\u5927\u5c0f\uff0c\u706b\u7130\u7684\u4f4d\u7f6e\u6211\u4eec\u662f\u8fd9\u6837\u5b9e\u73b0\u7684\uff0c\u5c06\u4e00\u4e2a\u9690\u85cf\u7684node\u8282\u70b9host\u5230\u98de\u673a\u7684\u5c3e\u90e8\uff0c\u8fd9\u6837\u8be5\u8282\u70b9\u4f1a\u81ea\u5b9a\u8ddf\u968f\u98de\u673a\u98de\u884c\u8fc7\u7a0b\u7684\u4f4d\u7f6e\u53d8\u5316\uff0c\u7ed8\u5236\u65f6\u706b\u7130\u65f6\u6211\u4eec\u901a\u8fc7Graph3dView#toViewPosition\u51fd\u6570\u5c06node\u4e09\u7ef4\u5750\u6807\u8f6c\u6362\u6210\u4e8c\u7ef4\u7684\u5c4f\u5e55Cavnas\u7684\u5750\u6807\uff0c\u8fd9\u8fd8\u6ca1\u5b8c\u6211\u4eec\u8fd8\u5f97\u5c06\u5c4f\u5e55\u5750\u6807\u8f6c\u6362\u6210WebGL\u9a71\u52a8\u7684Canvas\u7684POINT\u70b9\u5750\u6807\uff0c\u76f8\u5173\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush:javascript\">function draw(){\r\n\tgl.viewport(0, 0, canvas.width, canvas.height);\r\n\tgl.clearColor(0.0, 0.0, 0.0, 0.0);\r\n\tgl.clear(gl.COLOR_BUFFER_BIT);     \r\n\r\n\tgl.uniform1f(gl.getUniformLocation(program, 'time'), (Date.now() - startTime)\/1000 ); \r\n\tgl.uniform1f(gl.getUniformLocation(program, 'intensity'), intensity ); \r\n\r\n\tvar vertexBuffer = gl.createBuffer();\r\n\tgl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer);\r\n\r\n\tvar position = g3d.toViewPosition(node.p3());                                \r\n\tgl.bufferData(gl.ARRAY_BUFFER, new Float32Array([\r\n\t\t position.x\/g3d.getWidth()*2 - 1,\r\n\t\t 1 - position.y\/g3d.getHeight()*2\r\n\t]), gl.STATIC_DRAW);\r\n\tvar vertexLocation = gl.getAttribLocation(program, \"aVertexPosition\");\r\n\tgl.vertexAttribPointer(vertexLocation, 2, gl.FLOAT, false, 0, 0);\r\n\tgl.enableVertexAttribArray(vertexLocation);                   \r\n\tgl.drawArrays(gl.POINTS, 0, 1);\r\n\r\n\trequestAnimationFrame(draw); \r\n}              \r\n\r\nfunction resizeCanvas(){\r\n\tcanvas.width = g3d.getWidth() * devicePixelRatio;\r\n\tcanvas.style.width = g3d.getWidth() + 'px';  \r\n\tcanvas.height = g3d.getHeight() * devicePixelRatio;\r\n\tcanvas.style.height = g3d.getHeight() + 'px';                 \r\n}<\/pre>\n<p>\u4ee5\u4e0a\u4ee3\u7801\u6211\u4eec\u8fd8\u4f20\u5165\u4e86intensity\u7684\u5f3a\u5ea6\u53c2\u6570\uff0c\u8be5\u53c2\u6570\u6211\u4eec\u901a\u8fc7ht.Default.startAnim\u52a8\u753b\u51fd\u6570\uff0c\u63a7\u5236\u5176\u503c\u57280~4\u4e4b\u95f4\u4e0d\u65ad\u6765\u56de\u53d8\u5316\uff0c\u8fd9\u6837\u53ef\u8fbe\u5230\u706b\u7130\u6709\u5c0f\u53d8\u5927\u6765\u56de\u53d8\u6362\u7684\u7c7b\u4f3c\u544a\u8b66\u95ea\u70c1\u63d0\u793a\u6548\u679c\u3002\u8fd8\u6709var devicePixelRatio = 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6\u5f3a\u5236\u7528devicePixelRatio\u4e3a1\u7684\u65b9\u5f0f\u4e5f\u4e0d\u4f1a\u6709\u592a\u5927\u95ee\u9898\uff0c\u5e76\u4e14\u80fd\u8282\u7701\u5185\u5b58\u63d0\u9ad8\u7ed8\u5236\u6027\u80fd\uff0c\u67d0\u4e9b\u4f4e\u6027\u80fd\u7684\u7ec8\u7aef\u67d0\u4e9b\u60c5\u51b5\u4e0b\u751a\u81f3\u53ef\u4ee5\u518d\u964d\u7ea7\u5230\u5c0f\u4e8e1\u7684\u503c\u4ee5\u727a\u7272\u6548\u679c\u6362\u53d6\u6027\u80fd\u3002<\/p>\n<p>\u5343\u8f9b\u4e07\u82e6\u7ec8\u4e8e\u8ba9\u98de\u673a\u98de\u51fa\u4e86\u6211\u60f3\u8981\u7684\u6548\u679c\uff08<a href=\"http:\/\/v.youku.com\/v_show\/id_XODYyMzU3MDg0.html\">http:\/\/v.youku.com\/v_show\/id_XODYyMzU3MDg0.html<\/a>\uff09\uff0c\u5f53\u7136\u8fd8\u6709\u65e0\u6570\u7684\u7ec6\u8282\u53ef\u4ee5\u5b8c\u5584\uff0c\u4f8b\u5982\u53ef\u4ee5\u6839\u636e\u98de\u673a\u79bbeye\u7684\u8ddd\u79bb\u52a8\u6001\u6539\u53d8POINT\u70b9\u7684\u5927\u5c0f\uff0c\u6216\u6539\u9020GLSL\u5b9e\u73b0\u70df\u96fe\u7684\u7c92\u5b50\u7cfb\u7edf\u6548\u679c\u7b49\u7b49\uff0c\u4f46\u5143\u65e6\u5047\u671f\u7ed3\u675f\u4e86\u6211\u660e\u5929\u8fd8\u8981\u4e0a\u73ed\uff0c\u5176\u4ed6\u53ef\u5b8c\u5584\u7684\u5730\u65b9\u7559\u7ed9\u8bfb\u8005\u53bb\u60f3\u8c61\u4e86\u3002<\/p>\n<p><a href=\"http:\/\/www.hightopo.com\/blog\/wp-content\/uploads\/2015\/01\/Screen-Shot-2015-01-03-at-11.18.30-PM.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-379\" alt=\"Screen Shot 2015-01-03 at 11.18.30 PM\" 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frameborder=\"0\"><\/iframe><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/posts\/373"}],"collection":[{"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/comments?post=373"}],"version-history":[{"count":1,"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/posts\/373\/revisions"}],"predecessor-version":[{"id":380,"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/posts\/373\/revisions\/380"}],"wp:attachment":[{"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/media?parent=373"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/categories?post=373"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hightopo.com\/blog\/wp-json\/wp\/v2\/tags?post=373"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}