@author mr.doob / http://mrdoob.com/

Ported to Dart from JS by: @author rob silverton / http://www.unwrong.com/

class RenderableParticle implements IRenderable {
   num x = null;
   num y = null;
   num z = null;

   num rotation = null;
   Vector2 scale;

   Material material = null;

   RenderableParticle()
     : scale = new Vector2.zero();

}