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98 lines
3.6 KiB
C
98 lines
3.6 KiB
C
3 weeks ago
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkUnstructuredGridLinearRayIntegrator.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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* Copyright 2004 Sandia Corporation.
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* Under the terms of Contract DE-AC04-94AL85000, there is a non-exclusive
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* license for use of this work by or on behalf of the
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* U.S. Government. Redistribution and use in source and binary forms, with
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* or without modification, are permitted provided that this Notice and any
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* statement of authorship are reproduced on all copies.
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*/
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/**
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* @class vtkUnstructuredGridLinearRayIntegrator
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* @brief performs piecewise linear ray integration.
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*
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*
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*
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* vtkUnstructuredGridLinearRayIntegrator performs piecewise linear ray
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* integration. Considering that transfer functions in VTK are piecewise
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* linear, this class should give the "correct" integration under most
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* circumstances. However, the computations performed are fairly hefty and
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* should, for the most part, only be used as a benchmark for other, faster
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* methods.
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*
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* @sa
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* vtkUnstructuredGridPartialPreIntegration
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*
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*/
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#ifndef vtkUnstructuredGridLinearRayIntegrator_h
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#define vtkUnstructuredGridLinearRayIntegrator_h
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#include "vtkRenderingVolumeModule.h" // For export macro
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#include "vtkUnstructuredGridVolumeRayIntegrator.h"
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class vtkLinearRayIntegratorTransferFunction;
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class vtkVolumeProperty;
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class VTKRENDERINGVOLUME_EXPORT vtkUnstructuredGridLinearRayIntegrator
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: public vtkUnstructuredGridVolumeRayIntegrator
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{
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public:
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vtkTypeMacro(vtkUnstructuredGridLinearRayIntegrator, vtkUnstructuredGridVolumeRayIntegrator);
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static vtkUnstructuredGridLinearRayIntegrator* New();
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void PrintSelf(ostream& os, vtkIndent indent) override;
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void Initialize(vtkVolume* volume, vtkDataArray* scalars) override;
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void Integrate(vtkDoubleArray* intersectionLengths, vtkDataArray* nearIntersections,
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vtkDataArray* farIntersections, float color[4]) override;
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//@{
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/**
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* Integrates a single ray segment. \c color is blended with the result
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* (with \c color in front). The result is written back into \c color.
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*/
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static void IntegrateRay(double length, double intensity_front, double attenuation_front,
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double intensity_back, double attenuation_back, float color[4]);
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static void IntegrateRay(double length, const double color_front[3], double attenuation_front,
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const double color_back[3], double attenuation_back, float color[4]);
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//@}
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/**
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* Computes Psi (as defined by Moreland and Angel, "A Fast High Accuracy
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* Volume Renderer for Unstructured Data").
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*/
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static float Psi(float length, float attenuation_front, float attenuation_back);
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protected:
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vtkUnstructuredGridLinearRayIntegrator();
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~vtkUnstructuredGridLinearRayIntegrator() override;
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vtkVolumeProperty* Property;
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vtkLinearRayIntegratorTransferFunction* TransferFunctions;
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vtkTimeStamp TransferFunctionsModified;
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int NumIndependentComponents;
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private:
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vtkUnstructuredGridLinearRayIntegrator(const vtkUnstructuredGridLinearRayIntegrator&) = delete;
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void operator=(const vtkUnstructuredGridLinearRayIntegrator&) = delete;
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};
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#endif // vtkUnstructuredGridLinearRayIntegrator_h
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