anchor.diff:    }
   
     String get fShaderFile => 'basicColor';
  +
  +  @override
  +  String get vShaderFile => 'BackgroundDotRenderingSystem';
   }
   
   class ParticleRenderingSystem extends WebGlRenderingSystem {
  
positive.code: 
    @override
    String get fShaderFile => 'basicColor';
  }
  
  
  
negative.code: 
    @override
    String get fShaderFile => 'basicColor';
  
    @override
    String get vShaderFile => 'PainometerRenderingSystem';
  }
  
  
  