| 1 | /**
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| 2 | * @author mikael emtinger / http://gomo.se/
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| 3 | * @author alteredq / http://alteredqualia.com/
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| 4 | * @author mrdoob / http://mrdoob.com/
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| 5 | */
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| 6 |
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| 7 | THREE.LOD = function () {
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| 8 |
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| 9 | THREE.Object3D.call( this );
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| 10 |
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| 11 | this.objects = [];
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| 12 |
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| 13 | };
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| 14 |
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| 15 |
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| 16 | THREE.LOD.prototype = Object.create( THREE.Object3D.prototype );
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| 17 |
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| 18 | THREE.LOD.prototype.addLevel = function ( object, distance ) {
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| 19 |
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| 20 | if ( distance === undefined ) distance = 0;
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| 21 |
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| 22 | distance = Math.abs( distance );
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| 23 |
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| 24 | for ( var l = 0; l < this.objects.length; l ++ ) {
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| 25 |
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| 26 | if ( distance < this.objects[ l ].distance ) {
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| 27 |
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| 28 | break;
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| 29 |
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| 30 | }
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| 31 |
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| 32 | }
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| 33 |
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| 34 | this.objects.splice( l, 0, { distance: distance, object: object } );
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| 35 | this.add( object );
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| 36 |
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| 37 | };
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| 38 |
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| 39 | THREE.LOD.prototype.getObjectForDistance = function ( distance ) {
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| 40 |
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| 41 | for ( var i = 1, l = this.objects.length; i < l; i ++ ) {
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| 42 |
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| 43 | if ( distance < this.objects[ i ].distance ) {
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| 44 |
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| 45 | break;
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| 46 |
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| 47 | }
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| 48 |
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| 49 | }
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| 50 |
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| 51 | return this.objects[ i - 1 ].object;
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| 52 |
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| 53 | };
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| 54 |
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| 55 | THREE.LOD.prototype.update = function () {
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| 56 |
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| 57 | var v1 = new THREE.Vector3();
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| 58 | var v2 = new THREE.Vector3();
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| 59 |
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| 60 | return function ( camera ) {
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| 61 |
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| 62 | if ( this.objects.length > 1 ) {
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| 63 |
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| 64 | v1.setFromMatrixPosition( camera.matrixWorld );
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| 65 | v2.setFromMatrixPosition( this.matrixWorld );
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| 66 |
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| 67 | var distance = v1.distanceTo( v2 );
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| 68 |
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| 69 | this.objects[ 0 ].object.visible = true;
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| 70 |
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| 71 | for ( var i = 1, l = this.objects.length; i < l; i ++ ) {
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| 72 |
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| 73 | if ( distance >= this.objects[ i ].distance ) {
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| 74 |
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| 75 | this.objects[ i - 1 ].object.visible = false;
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| 76 | this.objects[ i ].object.visible = true;
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| 77 |
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| 78 | } else {
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| 79 |
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| 80 | break;
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| 81 |
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| 82 | }
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| 83 |
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| 84 | }
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| 85 |
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| 86 | for( ; i < l; i ++ ) {
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| 87 |
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| 88 | this.objects[ i ].object.visible = false;
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| 89 |
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| 90 | }
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| 91 |
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| 92 | }
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| 93 |
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| 94 | };
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| 95 |
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| 96 | }();
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| 97 |
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| 98 | THREE.LOD.prototype.clone = function () {
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| 99 |
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| 100 | // TODO
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| 101 |
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| 102 | };
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