public function @ax-student-ar-org-papervision3d-core-geom-renderables-Line3D(instance:Lines3D, material:LineMaterial, size:Number, vertex0:Vertex3D, vertex1:Vertex3D)
                  {
                          this.size = size;
                          this.material = material;
                          this.v0 = vertex0;
                          this.v1 = vertex1;
                          this.cV = vertex1;
                          this.instance = instance;
                          this.renderCommand = new RenderLine(this);
                  }
                  
                  public function addControlVertex(cx:Number, cy:Number, cz:Number) :void
                  {
                          cV = new Vertex3D(cx,cy,cz);
                          
                          if(instance.geometry.vertices.indexOf(cV) == -1){
                                  instance.geometry.vertices.push(cV);
                          }                
                          
                  }
                  
                  
                  override public function getRenderListItem():IRenderListItem
                  {
                          return this.renderCommand;
                  }
                  
          }
  }