 |
VTK
9.0.1
|
Go to the documentation of this file.
42 #ifndef vtkUnstructuredGridPartialPreIntegration_h
43 #define vtkUnstructuredGridPartialPreIntegration_h
46 #include "vtkRenderingVolumeModule.h"
49 class vtkPartialPreIntegrationTransferFunction;
70 static void IntegrateRay(
double length,
double intensity_front,
double attenuation_front,
71 double intensity_back,
double attenuation_back,
float color[4]);
72 static void IntegrateRay(
double length,
const double color_front[3],
double attenuation_front,
73 const double color_back[3],
double attenuation_back,
float color[4]);
83 static float Psi(
float taufD,
float taubD);
84 static float* GetPsiTable(
int&
size);
85 static void BuildPsiTable();
103 static float PsiTable[PSI_TABLE_SIZE * PSI_TABLE_SIZE];
114 float gammaf = taufD / (taufD + 1);
115 float gammab = taubD / (taubD + 1);
128 double intensity_front,
double attenuation_front,
double intensity_back,
double attenuation_back,
131 float taufD =
length * attenuation_front;
132 float taubD =
length * attenuation_back;
134 float zeta =
static_cast<float>(exp(-0.5 * (taufD + taubD)));
135 float alpha = 1 - zeta;
138 (1 -
color[3]) * (intensity_front * (1 -
Psi) + intensity_back * (
Psi - zeta));
140 color[0] += newintensity;
141 color[1] += newintensity;
142 color[2] += newintensity;
147 const double color_front[3],
double attenuation_front,
const double color_back[3],
148 double attenuation_back,
float color[4])
150 float taufD =
length * attenuation_front;
151 float taubD =
length * attenuation_back;
153 float zeta =
static_cast<float>(exp(-0.5 * (taufD + taubD)));
154 float alpha = 1 - zeta;
156 color[0] += (1 -
color[3]) * (color_front[0] * (1 -
Psi) + color_back[0] * (
Psi - zeta));
157 color[1] += (1 -
color[3]) * (color_front[1] * (1 -
Psi) + color_back[1] * (
Psi - zeta));
158 color[2] += (1 -
color[3]) * (color_front[2] * (1 -
Psi) + color_back[2] * (
Psi - zeta));
162 #endif // vtkUnstructuredGridPartialPreIntegration_h
a superclass for volume ray integration functions
static int Floor(double x)
Rounds a double to the nearest integer not greater than itself.
virtual void Integrate(vtkDoubleArray *intersectionLengths, vtkDataArray *nearIntersections, vtkDataArray *farIntersections, float color[4])=0
Given a set of intersections (defined by the three arrays), compute the piecewise integration of the ...
represents a volume (data & properties) in a rendered scene
static vtkObject * New()
Create an object with Debug turned off, modified time initialized to zero, and reference counting on.
record modification and/or execution time
vtkPartialPreIntegrationTransferFunction * TransferFunctions
abstract superclass for arrays of numeric data
vtkVolumeProperty * Property
static float PsiTable[PSI_TABLE_SIZE *PSI_TABLE_SIZE]
vtkTimeStamp TransferFunctionsModified
static float * GetPsiTable(int &size)
a simple class to control print indentation
int NumIndependentComponents
performs piecewise linear ray integration.
static void IntegrateRay(double length, double intensity_front, double attenuation_front, double intensity_back, double attenuation_back, float color[4])
Integrates a single ray segment.
virtual void Initialize(vtkVolume *volume, vtkDataArray *scalars)=0
Set up the integrator with the given properties and scalars.
dynamic, self-adjusting array of double
static float Psi(float taufD, float taubD)
Looks up Psi (as defined by Moreland and Angel, "A Fast High Accuracy Volume Renderer for Unstructure...
represents the common properties for rendering a volume.
void PrintSelf(ostream &os, vtkIndent indent) override
Methods invoked by print to print information about the object including superclasses.