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/*=========================================================================
Program: Visualization Toolkit
Module: vtkFrustumCoverageCuller.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.
=========================================================================*/
/**
* @class vtkFrustumCoverageCuller
* @brief cull props based on frustum coverage
*
* vtkFrustumCoverageCuller will cull props based on the coverage in
* the view frustum. The coverage is computed by enclosing the prop in
* a bounding sphere, projecting that to the viewing coordinate system, then
* taking a slice through the view frustum at the center of the sphere. This
* results in a circle on the plane slice through the view frustum. This
* circle is enclosed in a squared, and the fraction of the plane slice that
* this square covers is the coverage. This is a number between 0 and 1.
* If the number is less than the MinumumCoverage, the allocated render time
* for that prop is set to zero. If it is greater than the MaximumCoverage,
* the allocated render time is set to 1.0. In between, a linear ramp is used
* to convert coverage into allocated render time.
*
* @sa
* vtkCuller
*/
#ifndef vtkFrustumCoverageCuller_h
#define vtkFrustumCoverageCuller_h
#include "vtkRenderingCoreModule.h" // For export macro
#include "vtkCuller.h"
#define VTK_CULLER_SORT_NONE 0
#define VTK_CULLER_SORT_FRONT_TO_BACK 1
#define VTK_CULLER_SORT_BACK_TO_FRONT 2
class vtkProp;
class vtkRenderer;
class VTKRENDERINGCORE_EXPORT vtkFrustumCoverageCuller : public vtkCuller
{
public:
static vtkFrustumCoverageCuller *New();
vtkTypeMacro(vtkFrustumCoverageCuller,vtkCuller);
void PrintSelf(ostream& os,vtkIndent indent);
//@{
/**
* Set/Get the minimum coverage - props with less coverage than this
* are given no time to render (they are culled)
*/
vtkSetMacro( MinimumCoverage, double );
vtkGetMacro( MinimumCoverage, double );
//@}
//@{
/**
* Set/Get the maximum coverage - props with more coverage than this are
* given an allocated render time of 1.0 (the maximum)
*/
vtkSetMacro( MaximumCoverage, double );
vtkGetMacro( MaximumCoverage, double );
//@}
//@{
/**
* Set the sorting style - none, front-to-back or back-to-front
* The default is none
*/
vtkSetClampMacro( SortingStyle, int,
VTK_CULLER_SORT_NONE, VTK_CULLER_SORT_BACK_TO_FRONT );
vtkGetMacro(SortingStyle,int);
void SetSortingStyleToNone()
{this->SetSortingStyle(VTK_CULLER_SORT_NONE);};
void SetSortingStyleToBackToFront()
{this->SetSortingStyle(VTK_CULLER_SORT_BACK_TO_FRONT);};
void SetSortingStyleToFrontToBack()
{this->SetSortingStyle(VTK_CULLER_SORT_FRONT_TO_BACK);};
const char *GetSortingStyleAsString(void);
//@}
/**
* WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE
* DO NOT USE THESE METHODS OUTSIDE OF THE RENDERING PROCESS
* Perform the cull operation
* This method should only be called by vtkRenderer as part of
* the render process
*/
double Cull( vtkRenderer *ren, vtkProp **propList,
int& listLength, int& initialized );
protected:
vtkFrustumCoverageCuller();
~vtkFrustumCoverageCuller() {}
double MinimumCoverage;
double MaximumCoverage;
int SortingStyle;
private:
vtkFrustumCoverageCuller(const vtkFrustumCoverageCuller&) VTK_DELETE_FUNCTION;
void operator=(const vtkFrustumCoverageCuller&) VTK_DELETE_FUNCTION;
};
#endif
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