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114 lines
3.7 KiB
C
114 lines
3.7 KiB
C
3 weeks ago
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkFrustumCoverageCuller.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkFrustumCoverageCuller
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* @brief cull props based on frustum coverage
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*
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* vtkFrustumCoverageCuller will cull props based on the coverage in
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* the view frustum. The coverage is computed by enclosing the prop in
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* a bounding sphere, projecting that to the viewing coordinate system, then
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* taking a slice through the view frustum at the center of the sphere. This
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* results in a circle on the plane slice through the view frustum. This
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* circle is enclosed in a squared, and the fraction of the plane slice that
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* this square covers is the coverage. This is a number between 0 and 1.
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* If the number is less than the MinumumCoverage, the allocated render time
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* for that prop is set to zero. If it is greater than the MaximumCoverage,
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* the allocated render time is set to 1.0. In between, a linear ramp is used
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* to convert coverage into allocated render time.
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*
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* @sa
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* vtkCuller
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*/
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#ifndef vtkFrustumCoverageCuller_h
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#define vtkFrustumCoverageCuller_h
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#include "vtkRenderingCoreModule.h" // For export macro
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#include "vtkCuller.h"
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#define VTK_CULLER_SORT_NONE 0
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#define VTK_CULLER_SORT_FRONT_TO_BACK 1
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#define VTK_CULLER_SORT_BACK_TO_FRONT 2
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class vtkProp;
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class vtkRenderer;
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class VTKRENDERINGCORE_EXPORT vtkFrustumCoverageCuller : public vtkCuller
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{
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public:
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static vtkFrustumCoverageCuller *New();
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vtkTypeMacro(vtkFrustumCoverageCuller,vtkCuller);
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void PrintSelf(ostream& os,vtkIndent indent);
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//@{
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/**
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* Set/Get the minimum coverage - props with less coverage than this
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* are given no time to render (they are culled)
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*/
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vtkSetMacro( MinimumCoverage, double );
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vtkGetMacro( MinimumCoverage, double );
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//@}
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//@{
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/**
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* Set/Get the maximum coverage - props with more coverage than this are
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* given an allocated render time of 1.0 (the maximum)
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*/
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vtkSetMacro( MaximumCoverage, double );
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vtkGetMacro( MaximumCoverage, double );
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//@}
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//@{
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/**
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* Set the sorting style - none, front-to-back or back-to-front
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* The default is none
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*/
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vtkSetClampMacro( SortingStyle, int,
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VTK_CULLER_SORT_NONE, VTK_CULLER_SORT_BACK_TO_FRONT );
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vtkGetMacro(SortingStyle,int);
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void SetSortingStyleToNone()
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{this->SetSortingStyle(VTK_CULLER_SORT_NONE);};
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void SetSortingStyleToBackToFront()
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{this->SetSortingStyle(VTK_CULLER_SORT_BACK_TO_FRONT);};
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void SetSortingStyleToFrontToBack()
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{this->SetSortingStyle(VTK_CULLER_SORT_FRONT_TO_BACK);};
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const char *GetSortingStyleAsString(void);
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//@}
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/**
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* WARNING: INTERNAL METHOD - NOT INTENDED FOR GENERAL USE
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* DO NOT USE THESE METHODS OUTSIDE OF THE RENDERING PROCESS
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* Perform the cull operation
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* This method should only be called by vtkRenderer as part of
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* the render process
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*/
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double Cull( vtkRenderer *ren, vtkProp **propList,
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int& listLength, int& initialized );
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protected:
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vtkFrustumCoverageCuller();
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~vtkFrustumCoverageCuller() {}
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double MinimumCoverage;
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double MaximumCoverage;
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int SortingStyle;
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private:
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vtkFrustumCoverageCuller(const vtkFrustumCoverageCuller&) VTK_DELETE_FUNCTION;
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void operator=(const vtkFrustumCoverageCuller&) VTK_DELETE_FUNCTION;
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};
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#endif
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