Level Of Detail Object

Software: Away3D 4.x

therealloft, Member
Posted: 29 December 2014 03:35 PM   Total Posts: 63

Hey fellow users i created a new class in my library called “LODObject.as” you might find it useful.

package{
 import flash
.geom.Vector3D;
 
import away3d.containers.ObjectContainer3D;
 
import away3d.entities.Mesh;
 public class 
LODGroup extends ObjectContainer3D{
  
public var viewRanges:Array;
  public var 
lodModels:Array;
  private var 
currentLevel:int = -2;
  public function 
LODGroup(viewRanges:Array, lodModels:Array){
   this
.viewRanges viewRanges;
   
this.lodModels lodModels;
   for 
each(var m:ObjectContainer3D in this.lodModels){
    this
.addChild(m);
    
m.visible false;
   
}
  }
  
public function update(camPosition:Vector3D):void{
   
var d:Number Vector3D.distance(camPositionthis.position);
   var 
level:int = -1;
   for(var 
i:int 0this.viewRanges.lengthi++){
    
if(this.viewRanges[i]){
     level 
i;
     
this.viewRanges.length;
    
}
   }
   
if(level == -1){level this.viewRanges.length;}
   
if(this.currentLevel != level){swapLOD(level);}
  }
  
private function swapLOD(level:int):void{
   
for each(var m:ObjectContainer3D in this.lodModels){m.visible false;}
   this
.lodModels[level].visible true;
   
this.currentLevel level;
  
}
 }

super simple to use

var geo1:SphereGeometry = new SphereGeometry(50,64,64);
var geo2:SphereGeometry = new SphereGeometry(50,32,32);
var geo3:SphereGeometry = new SphereGeometry(50,8,8);
var geo4:SphereGeometry = new SphereGeometry(50,4,4);
var m1:Mesh = new Mesh(geo1, material);
var m2:Mesh = new Mesh(geo2, material);
var m3:Mesh = new Mesh(geo3, material);
var m4:Mesh = new Mesh(geo4, material);
var meshList:Array = [m1,m2,m3,m4];
var ranges:Array = [200,400,600]; //should always be 1 less than meshList length
var lodGroup:LODGroup(ranges, meshList);
_scene.addChild(lodGroup);

...

loop(){
    lodGroup.update(_view.camera.position);
    _view.render();
}

if anyone finds this useful, let me know

   
   
‹‹ Voxel Engine

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