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POHow to draw simple square using BufferGeometry?
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  1. POHow to draw simple square using BufferGeometry?
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    copied!<p>How can I draw simple square using <code>BufferGeometry</code>? For example <code>BufferGeometry</code> draws 120000 triangles and I want to knock it down to two that form a simple square. </p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;title&gt;test app&lt;/title&gt; &lt;style&gt;canvas { width: 100%; height: 100% }&lt;/style&gt; &lt;/head&gt; &lt;body&gt; &lt;script src="three.min.js"&gt;&lt;/script&gt; &lt;script&gt; var scene = new THREE.Scene(); var camera = new THREE.PerspectiveCamera(75, window.innerWidth/window.innerHeight, 0.1, 1000); var renderer = new THREE.WebGLRenderer(); renderer.setSize(window.innerWidth, window.innerHeight); document.body.appendChild(renderer.domElement); //var geometry = new THREE.CubeGeometry(1,1,1); var triangles = 2; var geometry = new THREE.BufferGeometry(); geometry.attributes = { index: { itemSize: 1, array: new Uint16Array( triangles * 3 ), numItems: triangles * 3 }, position: { itemSize: 3, array: new Float32Array( triangles * 3 * 3 ), numItems: triangles * 3 * 3 }, normal: { itemSize: 3, array: new Float32Array( triangles * 3 * 3 ), numItems: triangles * 3 * 3 }, color: { itemSize: 3, array: new Float32Array( triangles * 3 * 3 ), numItems: triangles * 3 * 3 } } var color = new THREE.Color(); var indices = geometry.attributes.index.array; var positions = geometry.attributes.position.array; var normals = geometry.attributes.normal.array; //not setting normals - is it relevant if there is no light defined? var colors = geometry.attributes.color.array; for ( var i = 0; i &lt; indices.length; i ++ ) { indices[ i ] = i % ( 3 * 1 ); // How to set indices???? } for ( var i = 0; i &lt; positions.length; i += 9 ) { //I know these will make two triangles at same position, but i want to see them appear first.. positions[ i ] = 0; positions[ i + 1 ] = 0; positions[ i + 2 ] = 0; positions[ i + 3 ] = 0; positions[ i + 4 ] = 1; positions[ i + 5 ] = 0; positions[ i + 6 ] = 1; positions[ i + 7 ] = 0; positions[ i + 8 ] = 0; color.setRGB( 55, 202, 55 ); colors[ i ] = color.r; colors[ i + 1 ] = color.g; colors[ i + 2 ] = color.b; colors[ i + 3 ] = color.r; colors[ i + 4 ] = color.g; colors[ i + 5 ] = color.b; colors[ i + 6 ] = color.r; colors[ i + 7 ] = color.g; colors[ i + 8 ] = color.b; } var material = new THREE.MeshBasicMaterial({color: 0x00ff00}); var square = new THREE.Mesh(geometry, material); scene.add(square); camera.position.z = -5; var render = function () { requestAnimationFrame(render); square.rotation.x += 0.1; square.rotation.y += 0.1; renderer.render(scene, camera); }; render(); &lt;/script&gt; &lt;/body&gt; </code></pre> <p></p>
 

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