Away3D Forum Smoke effect in Away3D 4

kurono, Sr. Member
Posted: 31 August 2011 07:36 AM Total Posts: 103

Hello, Away3D Team!

Last day I tried to implement simple smoke-like effect based on the Sprite3D class.

smokePuff.as

package 
{
 import flash.events.Event;
 import flash.geom.Vector3D;

 import away3d.containers.View3D;
 import away3d.entities.Sprite3D;
 import away3d.materials.BitmapMaterial;
 
 public class smokePuff extends Sprite3D
 {
  [Embed(source="/../embed/puff.png")]
  private var _texture:Class;
  
  private var _sc:Number = 1.3;
  private var _view:View3D;
  private var _mtl:BitmapMaterial;
 
  public function smokePuff(view:View3D, pos:Vector3D) {
   _view = view;
   _mtl = new BitmapMaterial(new flake_texture().bitmapData, true, false, false);
   _mtl.alphaBlending = true;

   super(_mtl, 16 + 16 * Math.random(), 16 + 16 * Math.random());
   _mtl.alpha = 1;
   this.position = pos;
   _view.scene.addChild(this);
   _view.addEventListener(Event.ENTER_FRAME, loop, false, 0, true);
  }
  
  private function loop(e:Event):void {
   this.scale(_sc);
   
   if (_mtl.alpha < 0){
    remove();
   } else {
    _mtl.alpha -= .1;
   }
  }
  
  private function remove():void {
   _view.removeEventListener(Event.ENTER_FRAME, loop);
   _view.scene.removeChild(this);
// should I do this???
   this.dispose(true);
   _mtl.dispose(true);
  }
 }
 
} 

Then in main class I call smokePuff each frame as follows:

...
for (var i:int = 0; i < 4; i++){
      var sm:smokePuff = new smokePuff(_view, SMOKE_INIT_POS.add(new Vector3D(25 - 50 * Math.random(), -250 - 50 * Math.random(), 25 - 50 * Math.random())));
     }
... 

where SMOKE_INIT_POS is smokes’ initial position

For first 5 seconds it works fine, but then… it dramatically slows down! It seems, that no one of just created smokePuffs removed from both view3D and PC’s memory. The question is WHY , coz I used to remove it (remove():void).
Please, help to solve my problem and sorry for bad english…

Apprentice, Jr. Member
Posted: 31 August 2011 09:16 AM Total Posts: 45 [ # 1 ]

As far as I know this is an open issue.

But the way you are doing it is not the best solution anyway.
What you should probably be doing is keeping a pool of your particles. Create them on initialization. Then when you need to show a particle, pick one from the pool and show it. When it’s done, hide it and return it to the pool.
In this way you avoid creating and deleting the particle and material every time you need one which is slow.

—Apprentice

kurono, Sr. Member
Posted: 31 August 2011 09:50 AM Total Posts: 103 [ # 2 ]

Thanks a lot, man! Your solution is pretty elegant rather than brute-force I used. You made my day!
Another one strange thing is that for 2D version everything was fine.

package
{
 import flash.display.Bitmap;
 import flash.display.BitmapData;
 import flash.display.BlendMode;
 import flash.display.MovieClip;
 import flash.events.Event;
 
 public class effect2d extends Bitmap
 {
 
  private var drX:Number;
  private var drY:Number;
  private var drZ:Number;
  private var t:Number = 0;
  private var r:Number;
  private var x_0:int;
  private var y_0:int;
  
  public function effect2d(x0:int = 0, y0:int = 0):void {
   x_0 = x0;
   y_0 = y0;
   super(new BitmapData(20, 35, false, 0x000000));
   x += x_0;
   y += y_0;
   blendMode = BlendMode.MULTIPLY;
   alpha = Math.random();
   r = 100 * Math.random();
   drX = 5 * Math.random();
   drY = 5 * Math.random();
   drZ = 5 * Math.random();
   scaleX = scaleY = Math.random();
   addEventListener(Event.ENTER_FRAME, loop, false, 0, true);
  }
  
  private function loop(e:Event):void {
   alpha -= .005;
   z = -r * Math.sin(t);
   x = -r * Math.cos(t) + x_0;
   y -= 5;
   r += 1;
   scaleX = scaleY += .01;
   rotationX += drX;
   rotationY += drY;
   rotationZ += drZ;
   
   t += .1;
 
   if (alpha < 0)
    remove();
  }
  
  private function remove():void{
   removeEventListener(Event.ENTER_FRAME, loop);
   parent.removeChild(this);
  }
 }
 
} 

felix, Newbie
Posted: 20 October 2011 01:44 AM Total Posts: 4 [ # 3 ]

It may be that creating multiple BitmapMaterials is eating memory and slowing performance. Try creating one material and sharing between your Sprite3Ds.

Smoke effect in Away3D 4 Software: Away3D 4.x

kurono, Sr. Member Posted: 31 August 2011 07:36 AM Total Posts: 103 Hello, Away3D Team! Last day I tried to implement simple smoke-like effect based on the Sprite3D class. smokePuff.as package { import flash.events.Event; import flash.geom.Vector3D; import away3d.containers.View3D; import away3d.entities.Sprite3D; import away3d.materials.BitmapMaterial; public class smokePuff extends Sprite3D { [Embed(source="/../embed/puff.png")] private var _texture:Class; private var _sc:Number = 1.3; private var _view:View3D; private var _mtl:BitmapMaterial; public function smokePuff(view:View3D, pos:Vector3D) { _view = view; _mtl = new BitmapMaterial(new flake_texture().bitmapData, true, false, false); _mtl.alphaBlending = true; super(_mtl, 16 + 16 * Math.random(), 16 + 16 * Math.random()); _mtl.alpha = 1; this.position = pos; _view.scene.addChild(this); _view.addEventListener(Event.ENTER_FRAME, loop, false, 0, true); } private function loop(e:Event):void { this.scale(_sc); if (_mtl.alpha < 0){ remove(); } else { _mtl.alpha -= .1; } } private function remove():void { _view.removeEventListener(Event.ENTER_FRAME, loop); _view.scene.removeChild(this); // should I do this??? this.dispose(true); _mtl.dispose(true); } } } Then in main class I call smokePuff each frame as follows: `... for (var i:int = 0; i < 4; i++){ var sm:smokePuff = new smokePuff(_view, SMOKE_INIT_POS.add(new Vector3D(25 - 50 * Math.random(), -250 - 50 * Math.random(), 25 - 50 * Math.random()))); } ...` where SMOKE_INIT_POS is smokes’ initial position For first 5 seconds it works fine, but then… it dramatically slows down! It seems, that no one of just created smokePuffs removed from both view3D and PC’s memory. The question is WHY , coz I used to remove it (remove():void). Please, help to solve my problem and sorry for bad english…
Apprentice, Jr. Member Posted: 31 August 2011 09:16 AM Total Posts: 45 [ # 1 ] As far as I know this is an open issue. But the way you are doing it is not the best solution anyway. What you should probably be doing is keeping a pool of your particles. Create them on initialization. Then when you need to show a particle, pick one from the pool and show it. When it’s done, hide it and return it to the pool. In this way you avoid creating and deleting the particle and material every time you need one which is slow. —Apprentice
kurono, Sr. Member Posted: 31 August 2011 09:50 AM Total Posts: 103 [ # 2 ] Thanks a lot, man! Your solution is pretty elegant rather than brute-force I used. You made my day! Another one strange thing is that for 2D version everything was fine. package { import flash.display.Bitmap; import flash.display.BitmapData; import flash.display.BlendMode; import flash.display.MovieClip; import flash.events.Event; public class effect2d extends Bitmap { private var drX:Number; private var drY:Number; private var drZ:Number; private var t:Number = 0; private var r:Number; private var x_0:int; private var y_0:int; public function effect2d(x0:int = 0, y0:int = 0):void { x_0 = x0; y_0 = y0; super(new BitmapData(20, 35, false, 0x000000)); x += x_0; y += y_0; blendMode = BlendMode.MULTIPLY; alpha = Math.random(); r = 100 * Math.random(); drX = 5 * Math.random(); drY = 5 * Math.random(); drZ = 5 * Math.random(); scaleX = scaleY = Math.random(); addEventListener(Event.ENTER_FRAME, loop, false, 0, true); } private function loop(e:Event):void { alpha -= .005; z = -r * Math.sin(t); x = -r * Math.cos(t) + x_0; y -= 5; r += 1; scaleX = scaleY += .01; rotationX += drX; rotationY += drY; rotationZ += drZ; t += .1; if (alpha < 0) remove(); } private function remove():void{ removeEventListener(Event.ENTER_FRAME, loop); parent.removeChild(this); } } }
felix, Newbie Posted: 20 October 2011 01:44 AM Total Posts: 4 [ # 3 ] It may be that creating multiple BitmapMaterials is eating memory and slowing performance. Try creating one material and sharing between your Sprite3Ds.

Smoke effect in Away3D 4

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