VTK  9.2.20221001
vtkLight Class Reference

a virtual light for 3D rendering More...

#include <vtkLight.h>

Inheritance diagram for vtkLight:
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Collaboration diagram for vtkLight:
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## Public Types

typedef vtkObject Superclass

## Public Member Functions

virtual vtkTypeBool IsA (const char *type)
Return 1 if this class is the same type of (or a subclass of) the named class. More...

vtkLightNewInstance () const

void PrintSelf (ostream &os, vtkIndent indent) override
Methods invoked by print to print information about the object including superclasses. More...

virtual vtkLightShallowClone ()
Create a new light object with the same light parameters than the current object (any ivar from the superclasses (vtkObject and vtkObjectBase), like reference counting, timestamp and observers are not copied). More...

virtual void Render (vtkRenderer *, int)
Abstract interface to renderer. More...

void TransformPoint (double a[3], double b[3])
Use transform matrix to transform point (if it exists). More...

void TransformVector (double a[3], double b[3])
Use transform matrix to transform vector (if it exists). More...

void DeepCopy (vtkLight *light)
Perform deep copy of this light. More...

virtual void SetAmbientColor (double, double, double)
Set/Get the color of the light. More...

virtual void SetAmbientColor (double[3])
Set/Get the color of the light. More...

virtual double * GetAmbientColor ()
Set/Get the color of the light. More...

virtual void GetAmbientColor (double data[3])
Set/Get the color of the light. More...

virtual void SetDiffuseColor (double, double, double)
Set/Get the color of the light. More...

virtual void SetDiffuseColor (double[3])
Set/Get the color of the light. More...

virtual double * GetDiffuseColor ()
Set/Get the color of the light. More...

virtual void GetDiffuseColor (double data[3])
Set/Get the color of the light. More...

virtual void SetSpecularColor (double, double, double)
Set/Get the color of the light. More...

virtual void SetSpecularColor (double[3])
Set/Get the color of the light. More...

virtual double * GetSpecularColor ()
Set/Get the color of the light. More...

virtual void GetSpecularColor (double data[3])
Set/Get the color of the light. More...

void SetColor (double, double, double)
Set/Get the color of the light. More...

void SetColor (const double a[3])
Set/Get the color of the light. More...

virtual void SetPosition (double, double, double)
Set/Get the position of the light. More...

virtual void SetPosition (double[3])
Set/Get the position of the light. More...

virtual double * GetPosition ()
Set/Get the position of the light. More...

virtual void GetPosition (double data[3])
Set/Get the position of the light. More...

void SetPosition (const float *a)
Set/Get the position of the light. More...

virtual void SetFocalPoint (double, double, double)
Set/Get the point at which the light is shining. More...

virtual void SetFocalPoint (double[3])
Set/Get the point at which the light is shining. More...

virtual double * GetFocalPoint ()
Set/Get the point at which the light is shining. More...

virtual void GetFocalPoint (double data[3])
Set/Get the point at which the light is shining. More...

void SetFocalPoint (const float *a)
Set/Get the point at which the light is shining. More...

virtual void SetIntensity (double)
Set/Get the brightness of the light (from one to zero). More...

virtual double GetIntensity ()
Set/Get the brightness of the light (from one to zero). More...

virtual void SetSwitch (vtkTypeBool)
Turn the light on or off. More...

virtual vtkTypeBool GetSwitch ()
Turn the light on or off. More...

virtual void SwitchOn ()
Turn the light on or off. More...

virtual void SwitchOff ()
Turn the light on or off. More...

virtual void SetPositional (vtkTypeBool)
Turn positional lighting on or off. More...

virtual vtkTypeBool GetPositional ()
Turn positional lighting on or off. More...

virtual void PositionalOn ()
Turn positional lighting on or off. More...

virtual void PositionalOff ()
Turn positional lighting on or off. More...

virtual void SetExponent (double)
Set/Get the exponent of the cosine used in positional lighting. More...

virtual double GetExponent ()
Set/Get the exponent of the cosine used in positional lighting. More...

virtual void SetConeAngle (double)
Set/Get the lighting cone angle of a positional light in degrees. More...

virtual double GetConeAngle ()
Set/Get the lighting cone angle of a positional light in degrees. More...

virtual void SetAttenuationValues (double, double, double)
Set/Get the quadratic attenuation constants. More...

virtual void SetAttenuationValues (double[3])
Set/Get the quadratic attenuation constants. More...

virtual double * GetAttenuationValues ()
Set/Get the quadratic attenuation constants. More...

virtual void GetAttenuationValues (double data[3])
Set/Get the quadratic attenuation constants. More...

virtual void SetTransformMatrix (vtkMatrix4x4 *)
Set/Get the light's transformation matrix. More...

virtual vtkMatrix4x4GetTransformMatrix ()
Set/Get the light's transformation matrix. More...

void GetTransformedPosition (double &x, double &y, double &z)
Get the position of the light, modified by the transformation matrix (if it exists). More...

void GetTransformedPosition (double a[3])
Get the position of the light, modified by the transformation matrix (if it exists). More...

double * GetTransformedPosition ()
Get the position of the light, modified by the transformation matrix (if it exists). More...

void GetTransformedFocalPoint (double &x, double &y, double &z)
Get the focal point of the light, modified by the transformation matrix (if it exists). More...

void GetTransformedFocalPoint (double a[3])
Get the focal point of the light, modified by the transformation matrix (if it exists). More...

double * GetTransformedFocalPoint ()
Get the focal point of the light, modified by the transformation matrix (if it exists). More...

void SetDirectionAngle (double elevation, double azimuth)
Set the position and focal point of a light based on elevation and azimuth. More...

void SetDirectionAngle (const double ang[2])
Set the position and focal point of a light based on elevation and azimuth. More...

virtual void SetLightType (int)
Set/Get the type of the light. More...

virtual int GetLightType ()
Set/Get the type of the light. More...

Set/Get the type of the light. More...

void SetLightTypeToSceneLight ()
Set/Get the type of the light. More...

void SetLightTypeToCameraLight ()
Set/Get the type of the light. More...

Query the type of the light. More...

int LightTypeIsSceneLight ()
Query the type of the light. More...

int LightTypeIsCameraLight ()
Query the type of the light. More...

Set/Get the shadow intensity By default a light will be completely blocked when in shadow by setting this value to less than 1.0 you can control how much light is attenuated when in shadow. More...

Set/Get the shadow intensity By default a light will be completely blocked when in shadow by setting this value to less than 1.0 you can control how much light is attenuated when in shadow. More...

virtual vtkInformationGetInformation ()
Set/Get the information object associated with the light. More...

virtual void SetInformation (vtkInformation *)
Set/Get the information object associated with the light. More...

Public Member Functions inherited from vtkObject
vtkBaseTypeMacro (vtkObject, vtkObjectBase)

virtual void DebugOn ()
Turn debugging output on. More...

virtual void DebugOff ()
Turn debugging output off. More...

bool GetDebug ()
Get the value of the debug flag. More...

void SetDebug (bool debugFlag)
Set the value of the debug flag. More...

virtual void Modified ()
Update the modification time for this object. More...

virtual vtkMTimeType GetMTime ()
Return this object's modified time. More...

void RemoveObserver (unsigned long tag)

void RemoveObservers (unsigned long event)

void RemoveObservers (const char *event)

void RemoveAllObservers ()

vtkTypeBool HasObserver (unsigned long event)

vtkTypeBool HasObserver (const char *event)

int InvokeEvent (unsigned long event)

int InvokeEvent (const char *event)

std::string GetObjectDescription () const override
The object description printed in messages and PrintSelf output. More...

unsigned long AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)
Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

unsigned long AddObserver (const char *event, vtkCommand *, float priority=0.0f)
Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

vtkCommandGetCommand (unsigned long tag)
Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

void RemoveObserver (vtkCommand *)
Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

void RemoveObservers (unsigned long event, vtkCommand *)
Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

void RemoveObservers (const char *event, vtkCommand *)
Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

vtkTypeBool HasObserver (unsigned long event, vtkCommand *)
Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

vtkTypeBool HasObserver (const char *event, vtkCommand *)
Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)

template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, void(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f)

template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, bool(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f)
Allow user to set the AbortFlagOn() with the return value of the callback method. More...

int InvokeEvent (unsigned long event, void *callData)
This method invokes an event and return whether the event was aborted or not. More...

int InvokeEvent (const char *event, void *callData)
This method invokes an event and return whether the event was aborted or not. More...

virtual void SetObjectName (const std::string &objectName)
Set/get the name of this object for reporting purposes. More...

virtual std::string GetObjectName () const
Set/get the name of this object for reporting purposes. More...

Public Member Functions inherited from vtkObjectBase
const char * GetClassName () const
Return the class name as a string. More...

virtual vtkIdType GetNumberOfGenerationsFromBase (const char *name)
Given the name of a base class of this class type, return the distance of inheritance between this class type and the named class (how many generations of inheritance are there between this class and the named class). More...

virtual void Delete ()
Delete a VTK object. More...

virtual void FastDelete ()
Delete a reference to this object. More...

void InitializeObjectBase ()

void Print (ostream &os)
Print an object to an ostream. More...

virtual void Register (vtkObjectBase *o)
Increase the reference count (mark as used by another object). More...

virtual void UnRegister (vtkObjectBase *o)
Decrease the reference count (release by another object). More...

int GetReferenceCount ()
Return the current reference count of this object. More...

void SetReferenceCount (int)
Sets the reference count. More...

bool GetIsInMemkind () const
A local state flag that remembers whether this object lives in the normal or extended memory space. More...

virtual void PrintHeader (ostream &os, vtkIndent indent)
Methods invoked by print to print information about the object including superclasses. More...

virtual void PrintTrailer (ostream &os, vtkIndent indent)
Methods invoked by print to print information about the object including superclasses. More...

virtual bool UsesGarbageCollector () const
Indicate whether the class uses vtkGarbageCollector or not. More...

## Static Public Member Functions

static vtkTypeBool IsTypeOf (const char *type)

static vtkLightSafeDownCast (vtkObjectBase *o)

static vtkLightNew ()
Create a light with the focal point at the origin and its position set to (0,0,1). More...

Static Public Member Functions inherited from vtkObject
static vtkObjectNew ()
Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...

static void BreakOnError ()
This method is called when vtkErrorMacro executes. More...

static void SetGlobalWarningDisplay (int val)
This is a global flag that controls whether any debug, warning or error messages are displayed. More...

static void GlobalWarningDisplayOn ()
This is a global flag that controls whether any debug, warning or error messages are displayed. More...

static void GlobalWarningDisplayOff ()
This is a global flag that controls whether any debug, warning or error messages are displayed. More...

static int GetGlobalWarningDisplay ()
This is a global flag that controls whether any debug, warning or error messages are displayed. More...

Static Public Member Functions inherited from vtkObjectBase
static vtkTypeBool IsTypeOf (const char *name)
Return 1 if this class type is the same type of (or a subclass of) the named class. More...

static vtkIdType GetNumberOfGenerationsFromBaseType (const char *name)
Given a the name of a base class of this class type, return the distance of inheritance between this class type and the named class (how many generations of inheritance are there between this class and the named class). More...

static vtkObjectBaseNew ()
Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...

static void SetMemkindDirectory (const char *directoryname)
The name of a directory, ideally mounted -o dax, to memory map an extended memory space within. More...

static bool GetUsingMemkind ()
A global state flag that controls whether vtkObjects are constructed in the usual way (the default) or within the extended memory space. More...

## Protected Member Functions

virtual vtkObjectBaseNewInstanceInternal () const

vtkLight ()

~vtkLight () override

Protected Member Functions inherited from vtkObject
vtkObject ()

~vtkObject () override

void RegisterInternal (vtkObjectBase *, vtkTypeBool check) override

void UnRegisterInternal (vtkObjectBase *, vtkTypeBool check) override

void InternalGrabFocus (vtkCommand *mouseEvents, vtkCommand *keypressEvents=nullptr)
These methods allow a command to exclusively grab all events. More...

void InternalReleaseFocus ()
These methods allow a command to exclusively grab all events. More...

Protected Member Functions inherited from vtkObjectBase
vtkObjectBase ()

virtual ~vtkObjectBase ()

virtual void ReportReferences (vtkGarbageCollector *)

vtkObjectBase (const vtkObjectBase &)

void operator= (const vtkObjectBase &)

## Protected Attributes

double FocalPoint [3]

double Position [3]

double Intensity

double AmbientColor [3]

double DiffuseColor [3]

double SpecularColor [3]

vtkTypeBool Switch

vtkTypeBool Positional

double Exponent

double ConeAngle

double AttenuationValues [3]

vtkMatrix4x4TransformMatrix

double TransformedFocalPointReturn [3]

double TransformedPositionReturn [3]

int LightType

vtkInformationInformation

Protected Attributes inherited from vtkObject
bool Debug

vtkTimeStamp MTime

vtkSubjectHelper * SubjectHelper

std::string ObjectName

Protected Attributes inherited from vtkObjectBase
std::atomic< int32_t > ReferenceCount

vtkWeakPointerBase ** WeakPointers

Static Protected Member Functions inherited from vtkObjectBase
static vtkMallocingFunction GetCurrentMallocFunction ()

static vtkReallocingFunction GetCurrentReallocFunction ()

static vtkFreeingFunction GetCurrentFreeFunction ()

static vtkFreeingFunction GetAlternateFreeFunction ()

## Detailed Description

a virtual light for 3D rendering

vtkLight is a virtual light for 3D rendering. It provides methods to locate and point the light, turn it on and off, and set its brightness and color. In addition to the basic infinite distance point light source attributes, you also can specify the light attenuation values and cone angle. These attributes are only used if the light is a positional light. The default is a directional light (e.g. infinite point light source).

Lights have a type that describes how the light should move with respect to the camera. A Headlight is always located at the current camera position and shines on the camera's focal point. A CameraLight also moves with the camera, but may not be coincident to it. CameraLights are defined in a normalized coordinate space where the camera is located at (0, 0, 1), the camera is looking at (0, 0, 0), and up is (0, 1, 0). Finally, a SceneLight is part of the scene itself and does not move with the camera. (Renderers are responsible for moving the light based on its type.)

Lights have a transformation matrix that describes the space in which they are positioned. A light's world space position and focal point are defined by their local position and focal point, transformed by their transformation matrix (if it exists).

Online Examples:

Tests:
vtkLight (Tests)

Definition at line 169 of file vtkLight.h.

## ◆ Superclass

 typedef vtkObject vtkLight::Superclass

Definition at line 172 of file vtkLight.h.

## ◆ vtkLight()

 vtkLight::vtkLight ( )
protected

## ◆ ~vtkLight()

 vtkLight::~vtkLight ( )
overrideprotected

## ◆ IsTypeOf()

 static vtkTypeBool vtkLight::IsTypeOf ( const char * type )
static

## ◆ IsA()

 virtual vtkTypeBool vtkLight::IsA ( const char * name )
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 vtkObjectBase.

Reimplemented in vtkOpenGLLight, vtkExternalLight, and vtkRIBLight.

## ◆ SafeDownCast()

 static vtkLight* vtkLight::SafeDownCast ( vtkObjectBase * o )
static

## ◆ NewInstanceInternal()

 virtual vtkObjectBase* vtkLight::NewInstanceInternal ( ) const
protectedvirtual

Reimplemented in vtkOpenGLLight, vtkExternalLight, and vtkRIBLight.

## ◆ NewInstance()

 vtkLight* vtkLight::NewInstance ( ) const

## ◆ PrintSelf()

 void vtkLight::PrintSelf ( ostream & os, vtkIndent indent )
overridevirtual

Methods invoked by print to print information about the object including superclasses.

Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from vtkObject.

Reimplemented in vtkOpenGLLight, and vtkExternalLight.

## ◆ New()

 static vtkLight* vtkLight::New ( )
static

Create a light with the focal point at the origin and its position set to (0,0,1).

The light is a SceneLight, its color is white (black ambient, white diffuse, white specular), intensity=1, the light is turned on, positional lighting is off, ConeAngle=30, AttenuationValues=(1,0,0), Exponent=1 and the TransformMatrix is NULL.

## ◆ ShallowClone()

 virtual vtkLight* vtkLight::ShallowClone ( )
virtual

Create a new light object with the same light parameters than the current object (any ivar from the superclasses (vtkObject and vtkObjectBase), like reference counting, timestamp and observers are not copied).

This is a shallow clone (TransformMatrix is referenced)

## ◆ Render()

 virtual void vtkLight::Render ( vtkRenderer * , int )
inlinevirtual

Abstract interface to renderer.

Each concrete subclass of vtkLight will load its data into the graphics system in response to this method invocation. The actual loading is performed by a vtkLightDevice subclass, which will get created automatically.

Reimplemented in vtkOpenGLLight, and vtkRIBLight.

Definition at line 199 of file vtkLight.h.

## ◆ SetAmbientColor() [1/2]

 virtual void vtkLight::SetAmbientColor ( double , double , double )
virtual

Set/Get the color of the light.

It is possible to set the ambient, diffuse and specular colors separately. The SetColor() method sets the diffuse and specular colors to the same color (this is a feature to preserve backward compatibility.)

Reimplemented in vtkExternalLight.

## ◆ SetAmbientColor() [2/2]

 virtual void vtkLight::SetAmbientColor ( double [3] )
virtual

Set/Get the color of the light.

It is possible to set the ambient, diffuse and specular colors separately. The SetColor() method sets the diffuse and specular colors to the same color (this is a feature to preserve backward compatibility.)

## ◆ GetAmbientColor() [1/2]

 virtual double* vtkLight::GetAmbientColor ( )
virtual

Set/Get the color of the light.

It is possible to set the ambient, diffuse and specular colors separately. The SetColor() method sets the diffuse and specular colors to the same color (this is a feature to preserve backward compatibility.)

## ◆ GetAmbientColor() [2/2]

 virtual void vtkLight::GetAmbientColor ( double data[3] )
virtual

Set/Get the color of the light.

It is possible to set the ambient, diffuse and specular colors separately. The SetColor() method sets the diffuse and specular colors to the same color (this is a feature to preserve backward compatibility.)

## ◆ SetDiffuseColor() [1/2]

 virtual void vtkLight::SetDiffuseColor ( double , double , double )
virtual

Set/Get the color of the light.

It is possible to set the ambient, diffuse and specular colors separately. The SetColor() method sets the diffuse and specular colors to the same color (this is a feature to preserve backward compatibility.)

Reimplemented in vtkExternalLight.

## ◆ SetDiffuseColor() [2/2]

 virtual void vtkLight::SetDiffuseColor ( double [3] )
virtual

Set/Get the color of the light.

It is possible to set the ambient, diffuse and specular colors separately. The SetColor() method sets the diffuse and specular colors to the same color (this is a feature to preserve backward compatibility.)

## ◆ GetDiffuseColor() [1/2]

 virtual double* vtkLight::GetDiffuseColor ( )
virtual

Set/Get the color of the light.

It is possible to set the ambient, diffuse and specular colors separately. The SetColor() method sets the diffuse and specular colors to the same color (this is a feature to preserve backward compatibility.)

## ◆ GetDiffuseColor() [2/2]

 virtual void vtkLight::GetDiffuseColor ( double data[3] )
virtual

Set/Get the color of the light.

It is possible to set the ambient, diffuse and specular colors separately. The SetColor() method sets the diffuse and specular colors to the same color (this is a feature to preserve backward compatibility.)

## ◆ SetSpecularColor() [1/2]

 virtual void vtkLight::SetSpecularColor ( double , double , double )
virtual

Set/Get the color of the light.

It is possible to set the ambient, diffuse and specular colors separately. The SetColor() method sets the diffuse and specular colors to the same color (this is a feature to preserve backward compatibility.)

Reimplemented in vtkExternalLight.

## ◆ SetSpecularColor() [2/2]

 virtual void vtkLight::SetSpecularColor ( double [3] )
virtual

Set/Get the color of the light.

It is possible to set the ambient, diffuse and specular colors separately. The SetColor() method sets the diffuse and specular colors to the same color (this is a feature to preserve backward compatibility.)

## ◆ GetSpecularColor() [1/2]

 virtual double* vtkLight::GetSpecularColor ( )
virtual

Set/Get the color of the light.

It is possible to set the ambient, diffuse and specular colors separately. The SetColor() method sets the diffuse and specular colors to the same color (this is a feature to preserve backward compatibility.)

## ◆ GetSpecularColor() [2/2]

 virtual void vtkLight::GetSpecularColor ( double data[3] )
virtual

Set/Get the color of the light.

It is possible to set the ambient, diffuse and specular colors separately. The SetColor() method sets the diffuse and specular colors to the same color (this is a feature to preserve backward compatibility.)

## ◆ SetColor() [1/2]

 void vtkLight::SetColor ( double , double , double )

Set/Get the color of the light.

It is possible to set the ambient, diffuse and specular colors separately. The SetColor() method sets the diffuse and specular colors to the same color (this is a feature to preserve backward compatibility.)

## ◆ SetColor() [2/2]

 void vtkLight::SetColor ( const double a[3] )
inline

Set/Get the color of the light.

It is possible to set the ambient, diffuse and specular colors separately. The SetColor() method sets the diffuse and specular colors to the same color (this is a feature to preserve backward compatibility.)

Definition at line 215 of file vtkLight.h.

## ◆ SetPosition() [1/3]

 virtual void vtkLight::SetPosition ( double , double , double )
virtual

Set/Get the position of the light.

Note: The position of the light is defined in the coordinate space indicated by its transformation matrix (if it exists). Thus, to get the light's world space position, use vtkGetTransformedPosition() instead of vtkGetPosition().

Reimplemented in vtkExternalLight.

## ◆ SetPosition() [2/3]

 virtual void vtkLight::SetPosition ( double [3] )
virtual

Set/Get the position of the light.

Note: The position of the light is defined in the coordinate space indicated by its transformation matrix (if it exists). Thus, to get the light's world space position, use vtkGetTransformedPosition() instead of vtkGetPosition().

## ◆ GetPosition() [1/2]

 virtual double* vtkLight::GetPosition ( )
virtual

Set/Get the position of the light.

Note: The position of the light is defined in the coordinate space indicated by its transformation matrix (if it exists). Thus, to get the light's world space position, use vtkGetTransformedPosition() instead of vtkGetPosition().

## ◆ GetPosition() [2/2]

 virtual void vtkLight::GetPosition ( double data[3] )
virtual

Set/Get the position of the light.

Note: The position of the light is defined in the coordinate space indicated by its transformation matrix (if it exists). Thus, to get the light's world space position, use vtkGetTransformedPosition() instead of vtkGetPosition().

## ◆ SetPosition() [3/3]

 void vtkLight::SetPosition ( const float * a )
inline

Set/Get the position of the light.

Note: The position of the light is defined in the coordinate space indicated by its transformation matrix (if it exists). Thus, to get the light's world space position, use vtkGetTransformedPosition() instead of vtkGetPosition().

Definition at line 228 of file vtkLight.h.

## ◆ SetFocalPoint() [1/3]

 virtual void vtkLight::SetFocalPoint ( double , double , double )
virtual

Set/Get the point at which the light is shining.

Note: The focal point of the light is defined in the coordinate space indicated by its transformation matrix (if it exists). Thus, to get the light's world space focal point, use vtkGetTransformedFocalPoint() instead of vtkGetFocalPoint().

Reimplemented in vtkExternalLight.

## ◆ SetFocalPoint() [2/3]

 virtual void vtkLight::SetFocalPoint ( double [3] )
virtual

Set/Get the point at which the light is shining.

Note: The focal point of the light is defined in the coordinate space indicated by its transformation matrix (if it exists). Thus, to get the light's world space focal point, use vtkGetTransformedFocalPoint() instead of vtkGetFocalPoint().

## ◆ GetFocalPoint() [1/2]

 virtual double* vtkLight::GetFocalPoint ( )
virtual

Set/Get the point at which the light is shining.

Note: The focal point of the light is defined in the coordinate space indicated by its transformation matrix (if it exists). Thus, to get the light's world space focal point, use vtkGetTransformedFocalPoint() instead of vtkGetFocalPoint().

## ◆ GetFocalPoint() [2/2]

 virtual void vtkLight::GetFocalPoint ( double data[3] )
virtual

Set/Get the point at which the light is shining.

Note: The focal point of the light is defined in the coordinate space indicated by its transformation matrix (if it exists). Thus, to get the light's world space focal point, use vtkGetTransformedFocalPoint() instead of vtkGetFocalPoint().

## ◆ SetFocalPoint() [3/3]

 void vtkLight::SetFocalPoint ( const float * a )
inline

Set/Get the point at which the light is shining.

Note: The focal point of the light is defined in the coordinate space indicated by its transformation matrix (if it exists). Thus, to get the light's world space focal point, use vtkGetTransformedFocalPoint() instead of vtkGetFocalPoint().

Definition at line 241 of file vtkLight.h.

## ◆ SetIntensity()

 virtual void vtkLight::SetIntensity ( double )
virtual

Set/Get the brightness of the light (from one to zero).

Reimplemented in vtkExternalLight.

## ◆ GetIntensity()

 virtual double vtkLight::GetIntensity ( )
virtual

Set/Get the brightness of the light (from one to zero).

## ◆ SetSwitch()

 virtual void vtkLight::SetSwitch ( vtkTypeBool )
virtual

Turn the light on or off.

## ◆ GetSwitch()

 virtual vtkTypeBool vtkLight::GetSwitch ( )
virtual

Turn the light on or off.

## ◆ SwitchOn()

 virtual void vtkLight::SwitchOn ( )
virtual

Turn the light on or off.

## ◆ SwitchOff()

 virtual void vtkLight::SwitchOff ( )
virtual

Turn the light on or off.

## ◆ SetPositional()

 virtual void vtkLight::SetPositional ( vtkTypeBool )
virtual

Turn positional lighting on or off.

Reimplemented in vtkExternalLight.

## ◆ GetPositional()

 virtual vtkTypeBool vtkLight::GetPositional ( )
virtual

Turn positional lighting on or off.

## ◆ PositionalOn()

 virtual void vtkLight::PositionalOn ( )
virtual

Turn positional lighting on or off.

## ◆ PositionalOff()

 virtual void vtkLight::PositionalOff ( )
virtual

Turn positional lighting on or off.

## ◆ SetExponent()

 virtual void vtkLight::SetExponent ( double )
virtual

Set/Get the exponent of the cosine used in positional lighting.

Reimplemented in vtkExternalLight.

## ◆ GetExponent()

 virtual double vtkLight::GetExponent ( )
virtual

Set/Get the exponent of the cosine used in positional lighting.

## ◆ SetConeAngle()

 virtual void vtkLight::SetConeAngle ( double )
virtual

Set/Get the lighting cone angle of a positional light in degrees.

This is the angle between the axis of the cone and a ray along the edge of the cone. A value of 90 (or more) indicates that you want no spot lighting effects just a positional light.

Reimplemented in vtkExternalLight.

## ◆ GetConeAngle()

 virtual double vtkLight::GetConeAngle ( )
virtual

Set/Get the lighting cone angle of a positional light in degrees.

This is the angle between the axis of the cone and a ray along the edge of the cone. A value of 90 (or more) indicates that you want no spot lighting effects just a positional light.

## ◆ SetAttenuationValues() [1/2]

 virtual void vtkLight::SetAttenuationValues ( double , double , double )
virtual

They are specified as constant, linear, and quadratic, in that order.

Reimplemented in vtkExternalLight.

## ◆ SetAttenuationValues() [2/2]

 virtual void vtkLight::SetAttenuationValues ( double [3] )
virtual

They are specified as constant, linear, and quadratic, in that order.

## ◆ GetAttenuationValues() [1/2]

 virtual double* vtkLight::GetAttenuationValues ( )
virtual

They are specified as constant, linear, and quadratic, in that order.

## ◆ GetAttenuationValues() [2/2]

 virtual void vtkLight::GetAttenuationValues ( double data[3] )
virtual

They are specified as constant, linear, and quadratic, in that order.

## ◆ SetTransformMatrix()

 virtual void vtkLight::SetTransformMatrix ( vtkMatrix4x4 * )
virtual

Set/Get the light's transformation matrix.

If a matrix is set for a light, the light's parameters (position and focal point) are transformed by the matrix before being rendered.

## ◆ GetTransformMatrix()

 virtual vtkMatrix4x4* vtkLight::GetTransformMatrix ( )
virtual

Set/Get the light's transformation matrix.

If a matrix is set for a light, the light's parameters (position and focal point) are transformed by the matrix before being rendered.

## ◆ GetTransformedPosition() [1/3]

 void vtkLight::GetTransformedPosition ( double & x, double & y, double & z )

Get the position of the light, modified by the transformation matrix (if it exists).

## ◆ GetTransformedPosition() [2/3]

 void vtkLight::GetTransformedPosition ( double a[3] )

Get the position of the light, modified by the transformation matrix (if it exists).

## ◆ GetTransformedPosition() [3/3]

 double* vtkLight::GetTransformedPosition ( )

Get the position of the light, modified by the transformation matrix (if it exists).

## ◆ GetTransformedFocalPoint() [1/3]

 void vtkLight::GetTransformedFocalPoint ( double & x, double & y, double & z )

Get the focal point of the light, modified by the transformation matrix (if it exists).

## ◆ GetTransformedFocalPoint() [2/3]

 void vtkLight::GetTransformedFocalPoint ( double a[3] )

Get the focal point of the light, modified by the transformation matrix (if it exists).

## ◆ GetTransformedFocalPoint() [3/3]

 double* vtkLight::GetTransformedFocalPoint ( )

Get the focal point of the light, modified by the transformation matrix (if it exists).

## ◆ TransformPoint()

 void vtkLight::TransformPoint ( double a[3], double b[3] )

Use transform matrix to transform point (if it exists).

## ◆ TransformVector()

 void vtkLight::TransformVector ( double a[3], double b[3] )

Use transform matrix to transform vector (if it exists).

## ◆ SetDirectionAngle() [1/2]

 void vtkLight::SetDirectionAngle ( double elevation, double azimuth )

Set the position and focal point of a light based on elevation and azimuth.

The light is moved so it is shining from the given angle. Angles are given in degrees. If the light is a positional light, it is made directional instead.

## ◆ SetDirectionAngle() [2/2]

 void vtkLight::SetDirectionAngle ( const double ang[2] )
inline

Set the position and focal point of a light based on elevation and azimuth.

The light is moved so it is shining from the given angle. Angles are given in degrees. If the light is a positional light, it is made directional instead.

Definition at line 347 of file vtkLight.h.

## ◆ DeepCopy()

 void vtkLight::DeepCopy ( vtkLight * light )

Perform deep copy of this light.

## ◆ SetLightType()

 virtual void vtkLight::SetLightType ( int )
virtual

Set/Get the type of the light.

A SceneLight is a light located in the world coordinate space. A light is initially created as a scene light.

A Headlight is always located at the camera and is pointed at the camera's focal point. The renderer is free to modify the position and focal point of the camera at any time.

A CameraLight is also attached to the camera, but is not necessarily located at the camera's position. CameraLights are defined in a coordinate space where the camera is located at (0, 0, 1), looking towards (0, 0, 0) at a distance of 1, with up being (0, 1, 0). CameraLight uses the transform matrix to establish this space.

Note: All SetLightType(), and SetLightTypeTo*() calls clear the light's transform matrix.

## ◆ GetLightType()

 virtual int vtkLight::GetLightType ( )
virtual

Set/Get the type of the light.

A SceneLight is a light located in the world coordinate space. A light is initially created as a scene light.

A Headlight is always located at the camera and is pointed at the camera's focal point. The renderer is free to modify the position and focal point of the camera at any time.

A CameraLight is also attached to the camera, but is not necessarily located at the camera's position. CameraLights are defined in a coordinate space where the camera is located at (0, 0, 1), looking towards (0, 0, 0) at a distance of 1, with up being (0, 1, 0). CameraLight uses the transform matrix to establish this space.

Note: All SetLightType(), and SetLightTypeTo*() calls clear the light's transform matrix.

inline

Set/Get the type of the light.

A SceneLight is a light located in the world coordinate space. A light is initially created as a scene light.

A Headlight is always located at the camera and is pointed at the camera's focal point. The renderer is free to modify the position and focal point of the camera at any time.

A CameraLight is also attached to the camera, but is not necessarily located at the camera's position. CameraLights are defined in a coordinate space where the camera is located at (0, 0, 1), looking towards (0, 0, 0) at a distance of 1, with up being (0, 1, 0). CameraLight uses the transform matrix to establish this space.

Note: All SetLightType(), and SetLightTypeTo*() calls clear the light's transform matrix.

Definition at line 377 of file vtkLight.h.

## ◆ SetLightTypeToSceneLight()

 void vtkLight::SetLightTypeToSceneLight ( )
inline

Set/Get the type of the light.

A SceneLight is a light located in the world coordinate space. A light is initially created as a scene light.

A Headlight is always located at the camera and is pointed at the camera's focal point. The renderer is free to modify the position and focal point of the camera at any time.

A CameraLight is also attached to the camera, but is not necessarily located at the camera's position. CameraLights are defined in a coordinate space where the camera is located at (0, 0, 1), looking towards (0, 0, 0) at a distance of 1, with up being (0, 1, 0). CameraLight uses the transform matrix to establish this space.

Note: All SetLightType(), and SetLightTypeTo*() calls clear the light's transform matrix.

Definition at line 378 of file vtkLight.h.

## ◆ SetLightTypeToCameraLight()

 void vtkLight::SetLightTypeToCameraLight ( )
inline

Set/Get the type of the light.

A SceneLight is a light located in the world coordinate space. A light is initially created as a scene light.

A Headlight is always located at the camera and is pointed at the camera's focal point. The renderer is free to modify the position and focal point of the camera at any time.

A CameraLight is also attached to the camera, but is not necessarily located at the camera's position. CameraLights are defined in a coordinate space where the camera is located at (0, 0, 1), looking towards (0, 0, 0) at a distance of 1, with up being (0, 1, 0). CameraLight uses the transform matrix to establish this space.

Note: All SetLightType(), and SetLightTypeTo*() calls clear the light's transform matrix.

Definition at line 379 of file vtkLight.h.

Query the type of the light.

## ◆ LightTypeIsSceneLight()

 int vtkLight::LightTypeIsSceneLight ( )

Query the type of the light.

## ◆ LightTypeIsCameraLight()

 int vtkLight::LightTypeIsCameraLight ( )

Query the type of the light.

 virtual void vtkLight::SetShadowAttenuation ( float )
virtual

Set/Get the shadow intensity By default a light will be completely blocked when in shadow by setting this value to less than 1.0 you can control how much light is attenuated when in shadow.

virtual

Set/Get the shadow intensity By default a light will be completely blocked when in shadow by setting this value to less than 1.0 you can control how much light is attenuated when in shadow.

## ◆ GetInformation()

 virtual vtkInformation* vtkLight::GetInformation ( )
virtual

Set/Get the information object associated with the light.

## ◆ SetInformation()

 virtual void vtkLight::SetInformation ( vtkInformation * )
virtual

Set/Get the information object associated with the light.

## ◆ FocalPoint

 double vtkLight::FocalPoint[3]
protected

Definition at line 414 of file vtkLight.h.

## ◆ Position

 double vtkLight::Position[3]
protected

Definition at line 415 of file vtkLight.h.

## ◆ Intensity

 double vtkLight::Intensity
protected

Definition at line 416 of file vtkLight.h.

## ◆ AmbientColor

 double vtkLight::AmbientColor[3]
protected

Definition at line 417 of file vtkLight.h.

## ◆ DiffuseColor

 double vtkLight::DiffuseColor[3]
protected

Definition at line 418 of file vtkLight.h.

## ◆ SpecularColor

 double vtkLight::SpecularColor[3]
protected

Definition at line 419 of file vtkLight.h.

## ◆ Switch

 vtkTypeBool vtkLight::Switch
protected

Definition at line 420 of file vtkLight.h.

## ◆ Positional

 vtkTypeBool vtkLight::Positional
protected

Definition at line 421 of file vtkLight.h.

## ◆ Exponent

 double vtkLight::Exponent
protected

Definition at line 422 of file vtkLight.h.

## ◆ ConeAngle

 double vtkLight::ConeAngle
protected

Definition at line 423 of file vtkLight.h.

## ◆ AttenuationValues

 double vtkLight::AttenuationValues[3]
protected

Definition at line 424 of file vtkLight.h.

## ◆ TransformMatrix

 vtkMatrix4x4* vtkLight::TransformMatrix
protected

Definition at line 425 of file vtkLight.h.

## ◆ TransformedFocalPointReturn

 double vtkLight::TransformedFocalPointReturn[3]
protected

Definition at line 426 of file vtkLight.h.

## ◆ TransformedPositionReturn

 double vtkLight::TransformedPositionReturn[3]
protected

Definition at line 427 of file vtkLight.h.

## ◆ LightType

 int vtkLight::LightType
protected

Definition at line 428 of file vtkLight.h.