Accueil / npm / three@0.186.1 / examples / jsm / loaders / XYZLoader.js
XYZLoader.js
import {
BufferGeometry,
Color,
FileLoader,
Float32BufferAttribute,
Loader,
SRGBColorSpace
} from 'three';
/**
* A loader for the XYZ format.
*
* XYZ is a very simple format for storing point clouds. The layouts
* `XYZ` (points) and `XYZRGB` (points + colors) are supported.
*
* ```js
* const loader = new XYZLoader();
* const geometry = await loader.loadAsync( 'models/xyz/helix_201.xyz' );
* geometry.center();
*
* const vertexColors = ( geometry.hasAttribute( 'color' ) === true );
* const material = new THREE.PointsMaterial( { size: 0.1, vertexColors: vertexColors } );
*
* const points = new THREE.Points( geometry, material );
* scene.add( points );
* ```
*
* @augments Loader
* @three_import import { XYZLoader } from 'three/addons/loaders/XYZLoader.js';
*/
class XYZLoader extends Loader {
/**
* Starts loading from the given URL and passes the loaded XYZ asset
* to the `onLoad()` callback.
*
* @param {string} url - The path/URL of the file to be loaded. This can also be a data URI.
* @param {function(BufferGeometry)} onLoad - Executed when the loading process has been finished.
* @param {onProgressCallback} onProgress - Executed while the loading is in progress.
* @param {onErrorCallback} onError - Executed when errors occur.
*/
load( url, onLoad, onProgress, onError ) {
const scope = this;
const loader = new FileLoader( this.manager );
loader.setPath( this.path );
loader.setRequestHeader( this.requestHeader );
loader.setWithCredentials( this.withCredentials );
loader.load( url, function ( text ) {
try {
onLoad( scope.parse( text ) );
} catch ( e ) {
if ( onError ) {
onError( e );
} else {
console.error( e );
}
scope.manager.itemError( url );
}
}, onProgress, onError );
}
/**
* Parses the given XYZ data and returns the resulting geometry.
*
* @param {string} text - The raw XYZ data as a string.
* @return {BufferGeometry} The geometry representing the point cloud.
*/
parse( text ) {
const lines = text.split( '\n' );
const vertices = [];
const colors = [];
const color = new Color();
for ( let line of lines ) {
line = line.trim();
if ( line.charAt( 0 ) === '#' ) continue; // skip comments
const lineValues = line.split( /\s+/ );
if ( lineValues.length === 3 ) {
// XYZ
vertices.push( parseFloat( lineValues[ 0 ] ) );
vertices.push( parseFloat( lineValues[ 1 ] ) );
vertices.push( parseFloat( lineValues[ 2 ] ) );
}
if ( lineValues.length === 6 ) {
// XYZRGB
vertices.push( parseFloat( lineValues[ 0 ] ) );
vertices.push( parseFloat( lineValues[ 1 ] ) );
vertices.push( parseFloat( lineValues[ 2 ] ) );
const r = parseFloat( lineValues[ 3 ] ) / 255;
const g = parseFloat( lineValues[ 4 ] ) / 255;
const b = parseFloat( lineValues[ 5 ] ) / 255;
color.setRGB( r, g, b, SRGBColorSpace );
colors.push( color.r, color.g, color.b );
}
}
const geometry = new BufferGeometry();
geometry.setAttribute( 'position', new Float32BufferAttribute( vertices, 3 ) );
if ( colors.length > 0 ) {
geometry.setAttribute( 'color', new Float32BufferAttribute( colors, 3 ) );
}
return geometry;
}
}
export { XYZLoader };