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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.
=========================================================================*/
// .NAME vtkFrustumCoverageCuller - cull props based on frustum coverage
// .SECTION Description
// 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.
// .SECTION see also
// 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);
// Description:
// 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 );
// Description:
// 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 );
// Description:
// 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);
//BTX
// Description:
// 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 );
//ETX
protected:
vtkFrustumCoverageCuller();
~vtkFrustumCoverageCuller() {}
double MinimumCoverage;
double MaximumCoverage;
int SortingStyle;
private:
vtkFrustumCoverageCuller(const vtkFrustumCoverageCuller&); // Not implemented.
void operator=(const vtkFrustumCoverageCuller&); // Not implemented.
};
#endif
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