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/*=========================================================================
Program: Visualization Toolkit
Module: vtkCellCenterDepthSort.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
/*
* Copyright 2003 Sandia Corporation.
* Under the terms of Contract DE-AC04-94AL85000, there is a non-exclusive
* license for use of this work by or on behalf of the
* U.S. Government. Redistribution and use in source and binary forms, with
* or without modification, are permitted provided that this Notice and any
* statement of authorship are reproduced on all copies.
*/
// .NAME vtkCellCenterDepthSort - A simple implementation of vtkCellDepthSort.
//
// .SECTION Description
// vtkCellCenterDepthSort is a simple and fast implementation of depth
// sort, but it only provides approximate results. The sorting algorithm
// finds the centroids of all the cells. It then performs the dot product
// of the centroids against a vector pointing in the direction of the
// camera transformed into object space. It then performs an ordinary sort
// on the result.
//
#ifndef vtkCellCenterDepthSort_h
#define vtkCellCenterDepthSort_h
#include "vtkRenderingCoreModule.h" // For export macro
#include "vtkVisibilitySort.h"
class vtkFloatArray;
class vtkCellCenterDepthSortStack;
class VTKRENDERINGCORE_EXPORT vtkCellCenterDepthSort : public vtkVisibilitySort
{
public:
vtkTypeMacro(vtkCellCenterDepthSort, vtkVisibilitySort);
virtual void PrintSelf(ostream &os, vtkIndent indent);
static vtkCellCenterDepthSort *New();
virtual void InitTraversal();
virtual vtkIdTypeArray *GetNextCells();
protected:
vtkCellCenterDepthSort();
virtual ~vtkCellCenterDepthSort();
vtkIdTypeArray *SortedCells;
vtkIdTypeArray *SortedCellPartition;
vtkFloatArray *CellCenters;
vtkFloatArray *CellDepths;
vtkFloatArray *CellPartitionDepths;
virtual float *ComputeProjectionVector();
virtual void ComputeCellCenters();
virtual void ComputeDepths();
private:
vtkCellCenterDepthSortStack *ToSort;
vtkCellCenterDepthSort(const vtkCellCenterDepthSort &); // Not implemented.
void operator=(const vtkCellCenterDepthSort &); // Not implemented.
};
#endif
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