blog.omine.net

Posts tagged with “optimization”


PV3D ribbons

April 13th, 2008

This week I worked on converting last week’s Particles and trails code to 3 dimensions, using the Effects branch of Papervision3D.

The final SWF runs smoothly at 30fps on my computer, and initially uses about 5MB of memory as measured by System.totalMemory. The biggest challenge in this project was fixing a memory leak that occurred whenever a ribbon was removed from the scene. If you run into this problem when removing a DisplayObject3D, remember to:

public function destroy():void
{
    geometry.faces = [];
    geometry.vertices = [];
    material.unregisterObject(this);
}

Each ribbon has 3 life phases:

  1. Growth: the ribbon grows until it reaches 120 vertices;
  2. Stability: the ribbon keeps moving but older faces and vertices are removed, keeping vertex count equal to 120;
  3. Removal: the ribbon stops moving and 2 vertices and 2 faces are removed frame by frame until it reaches zero vertices and zero faces.

The applied material is a simple FlatShadeMaterial with a moving light source. Finally, a BitmapLayerEffect with BlurFilter was applied and the viewport.blendMode was set to BlendMode.ADD.

View animation (move mouse to change camera rotation)

Particles and trails

April 6th, 2008

This is a remake of one of the first programmatic animations I did with Flash (AS2 at that time). I decided to translate it to AS3, looking for a better performance.

The pseudo swarm behaviour of the particles is obtained by combining the movement of the visible particles with the movement of a non-visible, reference particle.

Interestingly, the animation performed much better when I unified all Event.ENTER_FRAME handlers in one single place. Originally I made each particle and each trail listen to Event.ENTER_FRAME, removing the event listeners when destroying the particle. Now I only listen to Event.ENTER_FRAME in the Main class, and then loop through all instances to call each instance’s update() method.

The background color changes with time; one cycle should take 1 minute to complete. You can also click the background to toggle full screen mode.

View SWF