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51 lines
1.4 KiB
51 lines
1.4 KiB
<!DOCTYPE html>
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<html lang="zh">
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<head>
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<meta charset="utf-8" />
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<base href="../../../" />
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<script src="page.js"></script>
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<link type="text/css" rel="stylesheet" href="page.css" />
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</head>
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<body>
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<h1>Buffer Attribute Usage Constants</h1>
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<p>
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The usage constants can be used to provide a hint to the API regarding how the geometry buffer attribute will be used in order to optimize performance.
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</p>
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<h2>Code Example</h2>
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<code>
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const geometry = new THREE.BufferGeometry();
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const positionAttribute = new THREE.BufferAttribute( array, 3 , false );
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positionAttribute.setUsage( THREE.DynamicDrawUsage );
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geometry.setAttribute( 'position', positionAttribute );
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</code>
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<h2>Examples</h2>
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<p>[example:webgl_buffergeometry_drawrange materials / buffergeometry / drawrange ]</p>
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<h2>Geometry Usage</h2>
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<code>
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THREE.StaticDrawUsage
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THREE.DynamicDrawUsage
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THREE.StreamDrawUsage
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THREE.StaticReadUsage
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THREE.DynamicReadUsage
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THREE.StreamReadUsage
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THREE.StaticCopyUsage
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THREE.DynamicCopyUsage
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THREE.StreamCopyUsage
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</code>
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For more detailed information on each of these constants see [link:https://www.khronos.org/opengl/wiki/Buffer_Object#Buffer_Object_Usage this OpenGL documentation].
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<h2>Source</h2>
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<p>
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[link:https://github.com/mrdoob/three.js/blob/master/src/constants.js src/constants.js]
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</p>
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</body>
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</html>
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