177 lines
2.7 KiB
JavaScript
177 lines
2.7 KiB
JavaScript
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import { Vector3 } from '../math/Vector3.js';
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import { Object3D } from '../core/Object3D.js';
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/**
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* @author mikael emtinger / http://gomo.se/
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* @author alteredq / http://alteredqualia.com/
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* @author mrdoob / http://mrdoob.com/
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*/
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function LOD() {
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Object3D.call( this );
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this.type = 'LOD';
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Object.defineProperties( this, {
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levels: {
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enumerable: true,
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value: []
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}
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} );
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}
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LOD.prototype = Object.assign( Object.create( Object3D.prototype ), {
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constructor: LOD,
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copy: function ( source ) {
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Object3D.prototype.copy.call( this, source, false );
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var levels = source.levels;
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for ( var i = 0, l = levels.length; i < l; i ++ ) {
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var level = levels[ i ];
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this.addLevel( level.object.clone(), level.distance );
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}
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return this;
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},
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addLevel: function ( object, distance ) {
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if ( distance === undefined ) distance = 0;
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distance = Math.abs( distance );
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var levels = this.levels;
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for ( var l = 0; l < levels.length; l ++ ) {
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if ( distance < levels[ l ].distance ) {
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break;
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}
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}
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levels.splice( l, 0, { distance: distance, object: object } );
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this.add( object );
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},
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getObjectForDistance: function ( distance ) {
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var levels = this.levels;
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for ( var i = 1, l = levels.length; i < l; i ++ ) {
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if ( distance < levels[ i ].distance ) {
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break;
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}
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}
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return levels[ i - 1 ].object;
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},
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raycast: ( function () {
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var matrixPosition = new Vector3();
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return function raycast( raycaster, intersects ) {
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matrixPosition.setFromMatrixPosition( this.matrixWorld );
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var distance = raycaster.ray.origin.distanceTo( matrixPosition );
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this.getObjectForDistance( distance ).raycast( raycaster, intersects );
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};
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}() ),
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update: function () {
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var v1 = new Vector3();
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var v2 = new Vector3();
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return function update( camera ) {
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var levels = this.levels;
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if ( levels.length > 1 ) {
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v1.setFromMatrixPosition( camera.matrixWorld );
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v2.setFromMatrixPosition( this.matrixWorld );
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var distance = v1.distanceTo( v2 );
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levels[ 0 ].object.visible = true;
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for ( var i = 1, l = levels.length; i < l; i ++ ) {
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if ( distance >= levels[ i ].distance ) {
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levels[ i - 1 ].object.visible = false;
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levels[ i ].object.visible = true;
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} else {
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break;
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}
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}
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for ( ; i < l; i ++ ) {
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levels[ i ].object.visible = false;
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}
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}
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};
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}(),
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toJSON: function ( meta ) {
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var data = Object3D.prototype.toJSON.call( this, meta );
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data.object.levels = [];
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var levels = this.levels;
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for ( var i = 0, l = levels.length; i < l; i ++ ) {
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var level = levels[ i ];
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data.object.levels.push( {
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object: level.object.uuid,
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distance: level.distance
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} );
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}
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return data;
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}
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} );
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export { LOD };
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