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POHow to quickly update a large BufferGeometry?
 

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  1. POHow to quickly update a large BufferGeometry?
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    <p>I'm using a BufferGeometry to draw thousands of cubes which makes up the terrain, but having a hard time finding out how to update the geometry if I need to change the position of one of the cubes. For example, I have this code to initialize my geometry: (I'm doing my testing on an updated version of <a href="http://alteredqualia.com/three/examples/webgl_cubes.html">this example</a>)</p> <pre><code>// 12 triangles per cube (6 quads) var triangles = 12 * 150000; var geometry = new THREE.BufferGeometry(); geometry.attributes = { 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 } } positions = geometry.attributes.position.array; normals = geometry.attributes.normal.array; colors = geometry.attributes.color.array; </code></pre> <p>If I move a cube, it won't appear to be moved until I do: </p> <pre><code>geometry.attributes.position.needsUpdate = true; </code></pre> <p>This causes the FPS to drop while it's being updated. Is there another way I could do this? Seems a bit unnecessary when I'm only changing one cube (12 triangles/36 vertices). Although it might be - I haven't checked what <code>needsUpdate</code> actually does. Guessing it sends the array to the shader again.</p> <p>I was thinking I could split the geometry into separate smaller BufferGeometries but I'm not sure if that would help the performance overall. From what I understand, more geometries = less FPS.</p> <p>If anyone has any ideas how I would do this, it would be appreciated! :) Besides the updating issue, BufferGeometry seems to be exactly what I need. Thanks!</p>
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