text: //
  //  BillboardParticleEffect.h
  //  
  //
  
  #import "UtilityEffect.h"
  #import <GLKit/GLKit.h>  
  
  
  @interface UtilityBillboardParticleEffect : UtilityEffect
  
  @property (assign, nonatomic, readwrite) GLKMatrix4 
     projectionMatrix;
  @property (assign, nonatomic, readwrite) GLKMatrix4 
     modelviewMatrix;
  @property (strong, nonatomic, readwrite) GLKTextureInfo *
     texture2D;
  
  @end
  