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@@ -50,9 +50,9 @@
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varying vec3 vColor;
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void main() {
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- gl_Position = projectionMatrix * modelViewMatrix * vec4(position,1.0);
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vColor = vertColor;
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vVisible = visible;
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+ gl_Position = projectionMatrix * modelViewMatrix * vec4(position,1.0);
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}
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</script>
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<script type="x-shader/x-fragment" id="fragmentshader">
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@@ -70,13 +70,13 @@
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</head>
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<body onload="app()">
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<div id="title"></div>
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- <div id="ui"><a href="#" onclick="hide_lines();">CULL SOME LINES</a> - <a href="#" onclick="show_all_lines();">SHOW ALL LINES</a></div>
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+ <div id="ui"><a href="#" onclick="hideLines();">CULL SOME LINES</a> - <a href="#" onclick="showAllLines();">SHOW ALL LINES</a></div>
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<script>
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var camera, scene, renderer, stats;
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var geometry, mesh;
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- var num_lat = 100;
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- var num_lng = 200;
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- var num_lines_culled = 0;
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+ var numLat = 100;
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+ var numLng = 200;
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+ var numLinesCulled = 0;
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function app() {
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@@ -116,44 +116,44 @@
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window.addEventListener( 'resize', onWindowResize, false );
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- add_lines( 1.0 );
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+ addLines( 1.0 );
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}
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- function add_lines( radius ) {
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+ function addLines( radius ) {
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geometry = new THREE.BufferGeometry();
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- var line_positions = new Float32Array( num_lat * num_lng * 3 * 2 );
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- var line_colors = new Float32Array( num_lat * num_lng * 3 * 2 );
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- var visible = new Float32Array( num_lat * num_lng * 2 );
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+ var linePositions = new Float32Array( numLat * numLng * 3 * 2 );
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+ var lineColors = new Float32Array( numLat * numLng * 3 * 2 );
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+ var visible = new Float32Array( numLat * numLng * 2 );
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- for ( var i = 0; i < num_lat; ++ i ) {
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+ for ( var i = 0; i < numLat; ++ i ) {
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- for ( var j = 0; j < num_lng; ++ j ) {
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+ for ( var j = 0; j < numLng; ++ j ) {
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- var lat = ( Math.random() * Math.PI ) / 50.0 + i / num_lat * Math.PI;
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- var lng = ( Math.random() * Math.PI ) / 50.0 + j / num_lng * 2 * Math.PI;
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+ var lat = ( Math.random() * Math.PI ) / 50.0 + i / numLat * Math.PI;
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+ var lng = ( Math.random() * Math.PI ) / 50.0 + j / numLng * 2 * Math.PI;
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- var index = i * num_lng + j;
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+ var index = i * numLng + j;
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- line_positions[ index * 6 + 0 ] = 0;
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- line_positions[ index * 6 + 1 ] = 0;
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- line_positions[ index * 6 + 2 ] = 0;
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- line_positions[ index * 6 + 3 ] = radius * Math.sin( lat ) * Math.cos( lng );
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- line_positions[ index * 6 + 4 ] = radius * Math.cos( lat );
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- line_positions[ index * 6 + 5 ] = radius * Math.sin( lat ) * Math.sin( lng );
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+ linePositions[ index * 6 + 0 ] = 0;
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+ linePositions[ index * 6 + 1 ] = 0;
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+ linePositions[ index * 6 + 2 ] = 0;
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+ linePositions[ index * 6 + 3 ] = radius * Math.sin( lat ) * Math.cos( lng );
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+ linePositions[ index * 6 + 4 ] = radius * Math.cos( lat );
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+ linePositions[ index * 6 + 5 ] = radius * Math.sin( lat ) * Math.sin( lng );
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var color = new THREE.Color( 0xffffff );
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color.setHSL( lat / Math.PI, 1.0, 0.2 );
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- line_colors[ index * 6 + 0 ] = color.r;
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- line_colors[ index * 6 + 1 ] = color.g;
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- line_colors[ index * 6 + 2 ] = color.b;
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+ lineColors[ index * 6 + 0 ] = color.r;
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+ lineColors[ index * 6 + 1 ] = color.g;
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+ lineColors[ index * 6 + 2 ] = color.b;
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color.setHSL( lat / Math.PI, 1.0, 0.7 );
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- line_colors[ index * 6 + 3 ] = color.r;
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- line_colors[ index * 6 + 4 ] = color.g;
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- line_colors[ index * 6 + 5 ] = color.b;
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+ lineColors[ index * 6 + 3 ] = color.r;
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+ lineColors[ index * 6 + 4 ] = color.g;
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+ lineColors[ index * 6 + 5 ] = color.b;
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// non-0 is visible
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visible[ index * 2 + 0 ] = 1.0;
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@@ -163,33 +163,32 @@
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}
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- geometry.addAttribute( 'position', new THREE.BufferAttribute( line_positions, 3 ) );
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- geometry.addAttribute( 'vertColor', new THREE.BufferAttribute( line_colors, 3 ) );
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+ geometry.addAttribute( 'position', new THREE.BufferAttribute( linePositions, 3 ) );
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+ geometry.addAttribute( 'vertColor', new THREE.BufferAttribute( lineColors, 3 ) );
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geometry.addAttribute( 'visible', new THREE.BufferAttribute( visible, 1 ) );
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geometry.computeBoundingSphere();
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- var shader_material = new THREE.ShaderMaterial( {
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+ var shaderMaterial = new THREE.ShaderMaterial( {
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vertexShader: document.getElementById( 'vertexshader' ).textContent,
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fragmentShader: document.getElementById( 'fragmentshader' ).textContent
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} );
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- mesh = new THREE.LineSegments( geometry, shader_material );
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+ mesh = new THREE.LineSegments( geometry, shaderMaterial );
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scene.add( mesh );
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- update_count();
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+ updateCount();
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}
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- function update_count() {
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+ function updateCount() {
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- var str = 'BufferGeometry selective drawing: 1 draw call, ' + num_lat * num_lng + ' lines, ' + num_lines_culled + ' culled (<a target="_blank" href="http://callum.com">author</a>)';
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+ var str = 'BufferGeometry selective drawing: 1 draw call, ' + numLat * numLng + ' lines, ' + numLinesCulled + ' culled (<a target="_blank" href="http://callum.com">author</a>)';
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document.getElementById( 'title' ).innerHTML = str.replace( /\B(?=(\d{3})+(?!\d))/g, "," );
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-
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}
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- function hide_lines() {
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+ function hideLines() {
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for ( var i = 0; i < geometry.attributes.visible.array.length; i += 2 ) {
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@@ -197,7 +196,7 @@
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if ( geometry.attributes.visible.array[ i + 0 ] ) {
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- ++ num_lines_culled;
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+ ++ numLinesCulled;
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}
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@@ -209,13 +208,13 @@
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}
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geometry.attributes.visible.needsUpdate = true;
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- update_count();
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+ updateCount();
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}
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- function show_all_lines() {
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+ function showAllLines() {
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- num_lines_culled = 0;
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+ numLinesCulled = 0;
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for ( var i = 0; i < geometry.attributes.visible.array.length; i += 2 ) {
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@@ -226,7 +225,7 @@
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geometry.attributes.visible.needsUpdate = true;
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- update_count();
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+ updateCount();
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}
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Callum Prentice