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vtkEncodedGradientShader Class Reference

Compute shading tables for encoded normals. More...

#include <vtkEncodedGradientShader.h>

Inheritance diagram for vtkEncodedGradientShader:

Inheritance graph
Collaboration diagram for vtkEncodedGradientShader:

Collaboration graph
List of all members.

Public Methods

virtual const char * GetClassName ()
virtual int IsA (const char *type)
void PrintSelf (ostream &os, vtkIndent index)
virtual void SetZeroNormalDiffuseIntensity (float)
virtual float GetZeroNormalDiffuseIntensity ()
virtual void SetZeroNormalSpecularIntensity (float)
virtual float GetZeroNormalSpecularIntensity ()
void UpdateShadingTable (vtkRenderer *ren, vtkVolume *vol, vtkEncodedGradientEstimator *gradest)
float * GetRedDiffuseShadingTable (vtkVolume *vol)
float * GetGreenDiffuseShadingTable (vtkVolume *vol)
float * GetBlueDiffuseShadingTable (vtkVolume *vol)
float * GetRedSpecularShadingTable (vtkVolume *vol)
float * GetGreenSpecularShadingTable (vtkVolume *vol)
float * GetBlueSpecularShadingTable (vtkVolume *vol)

Static Public Methods

vtkEncodedGradientShader * New ()
int IsTypeOf (const char *type)
vtkEncodedGradientShader * SafeDownCast (vtkObject *o)

Protected Methods

 vtkEncodedGradientShader ()
 ~vtkEncodedGradientShader ()
 vtkEncodedGradientShader (const vtkEncodedGradientShader &)
void operator= (const vtkEncodedGradientShader &)
void BuildShadingTable (int index, float lightDirection[3], float lightColor[3], float lightIntensity, float viewDirection[3], float material[4], int twoSided, vtkEncodedGradientEstimator *gradest, int updateFlag)

Protected Attributes

float * ShadingTable [VTK_MAX_SHADING_TABLES][6]
vtkVolumeShadingTableVolume [VTK_MAX_SHADING_TABLES]
int ShadingTableSize [VTK_MAX_SHADING_TABLES]
float ZeroNormalDiffuseIntensity
float ZeroNormalSpecularIntensity

Detailed Description

Compute shading tables for encoded normals.

2000/12/10 20:08:36

vtkEncodedGradientShader computes shading tables for encoded normals that indicates the amount of diffuse and specular illumination that is received from all light sources at a surface location with that normal. For diffuse illumination this is accurate, but for specular illumination it is approximate for perspective projections since the center view direction is always used as the view direction. Since the shading table is dependent on the volume (for the transformation that must be applied to the normals to put them into world coordinates) there is a shading table per volume. This is necessary because multiple volumes can share a volume mapper.

Definition at line 71 of file vtkEncodedGradientShader.h.

Constructor & Destructor Documentation

vtkEncodedGradientShader::vtkEncodedGradientShader   [protected]

vtkEncodedGradientShader::~vtkEncodedGradientShader   [protected]

vtkEncodedGradientShader::vtkEncodedGradientShader const vtkEncodedGradientShader &    [inline, protected]

Definition at line 102 of file vtkEncodedGradientShader.h.

Member Function Documentation

vtkEncodedGradientShader* vtkEncodedGradientShader::New   [static]

Create an object with Debug turned off, modified time initialized to zero, and reference counting on.

Reimplemented from vtkObject.

virtual const char* vtkEncodedGradientShader::GetClassName   [virtual]

Return the class name as a string. This method is defined in all subclasses of vtkObject with the vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkObject.

int vtkEncodedGradientShader::IsTypeOf const char *    type [static]

Return 1 if this class type is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkObject.

virtual int vtkEncodedGradientShader::IsA const char *    type [virtual]

Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkObject.

vtkEncodedGradientShader* vtkEncodedGradientShader::SafeDownCast vtkObject   o [static]

Will cast the supplied object to vtkObject* is this is a safe operation (i.e., a safe downcast); otherwise NULL is returned. This method is defined in all subclasses of vtkObject with the vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkObject.

void vtkEncodedGradientShader::PrintSelf ostream &    os,
vtkIndent    index

Print the vtkEncodedGradientShader

Reimplemented from vtkObject.

virtual void vtkEncodedGradientShader::SetZeroNormalDiffuseIntensity float    [virtual]

Set / Get the intensity diffuse / specular light used for the zero normals.

virtual float vtkEncodedGradientShader::GetZeroNormalDiffuseIntensity   [virtual]

virtual void vtkEncodedGradientShader::SetZeroNormalSpecularIntensity float    [virtual]

virtual float vtkEncodedGradientShader::GetZeroNormalSpecularIntensity   [virtual]

void vtkEncodedGradientShader::UpdateShadingTable vtkRenderer   ren,
vtkVolume   vol,
vtkEncodedGradientEstimator   gradest

Cause the shading table to be updated

float* vtkEncodedGradientShader::GetRedDiffuseShadingTable vtkVolume   vol

Get the red/green/blue shading table.

float* vtkEncodedGradientShader::GetGreenDiffuseShadingTable vtkVolume   vol

float* vtkEncodedGradientShader::GetBlueDiffuseShadingTable vtkVolume   vol

float* vtkEncodedGradientShader::GetRedSpecularShadingTable vtkVolume   vol

float* vtkEncodedGradientShader::GetGreenSpecularShadingTable vtkVolume   vol

float* vtkEncodedGradientShader::GetBlueSpecularShadingTable vtkVolume   vol

void vtkEncodedGradientShader::operator= const vtkEncodedGradientShader &    [inline, protected]

Definition at line 103 of file vtkEncodedGradientShader.h.

void vtkEncodedGradientShader::BuildShadingTable int    index,
float    lightDirection[3],
float    lightColor[3],
float    lightIntensity,
float    viewDirection[3],
float    material[4],
int    twoSided,
vtkEncodedGradientEstimator   gradest,
int    updateFlag

Build a shading table for a light with the specified direction, and color for an object of the specified material properties. material[0] = ambient, material[1] = diffuse, material[2] = specular and material[3] = specular exponent. If the ambient flag is 1, then ambient illumination is added. If not, then this means we are calculating the "other side" of two sided lighting, so no ambient intensity is added in. If the update flag is 0, the shading table is overwritten with these new shading values. If the updateFlag is 1, then the computed light contribution is added to the current shading table values. There is one shading table per volume, and the index value indicated which index table should be used. It is computed in the UpdateShadingTable method.

Member Data Documentation

float* vtkEncodedGradientShader::ShadingTable[VTK_MAX_SHADING_TABLES][6] [protected]

Definition at line 132 of file vtkEncodedGradientShader.h.

vtkVolume* vtkEncodedGradientShader::ShadingTableVolume[VTK_MAX_SHADING_TABLES] [protected]

Definition at line 133 of file vtkEncodedGradientShader.h.

int vtkEncodedGradientShader::ShadingTableSize[VTK_MAX_SHADING_TABLES] [protected]

Definition at line 134 of file vtkEncodedGradientShader.h.

float vtkEncodedGradientShader::ZeroNormalDiffuseIntensity [protected]

Definition at line 138 of file vtkEncodedGradientShader.h.

float vtkEncodedGradientShader::ZeroNormalSpecularIntensity [protected]

Definition at line 139 of file vtkEncodedGradientShader.h.

The documentation for this class was generated from the following file:
Generated on Wed Nov 21 12:47:39 2001 for VTK by doxygen1.2.11.1 written by Dimitri van Heesch, © 1997-2001