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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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List of all members.

Public Methods

virtual const char * GetClassName ()
virtual int IsA (const char *type)
void PrintSelf (ostream &os, vtkIndent indent)
virtual void Render (vtkRenderer *, int)
virtual void SetColor (float, float, float)
virtual void SetColor (float[3])
virtual float * GetColor ()
virtual void GetColor (float data[3])
virtual void SetPosition (float, float, float)
virtual void SetPosition (float[3])
virtual float * GetPosition ()
virtual void GetPosition (float data[3])
void SetPosition (double *a)
virtual void SetFocalPoint (float, float, float)
virtual void SetFocalPoint (float[3])
virtual float * GetFocalPoint ()
virtual void GetFocalPoint (float data[3])
void SetFocalPoint (double *a)
virtual void SetIntensity (float)
virtual float GetIntensity ()
virtual void SetSwitch (int)
virtual int GetSwitch ()
virtual void SwitchOn ()
virtual void SwitchOff ()
virtual void SetPositional (int)
virtual int GetPositional ()
virtual void PositionalOn ()
virtual void PositionalOff ()
virtual void SetExponent (float)
virtual float GetExponent ()
virtual void SetConeAngle (float)
virtual float GetConeAngle ()
virtual void SetAttenuationValues (float, float, float)
virtual void SetAttenuationValues (float[3])
virtual float * GetAttenuationValues ()
virtual void GetAttenuationValues (float data[3])
virtual void SetTransformMatrix (vtkMatrix4x4 *)
virtual vtkMatrix4x4GetTransformMatrix ()
void GetTransformedPosition (float &a0, float &a1, float &a2)
void GetTransformedPosition (float a[3])
float * GetTransformedPosition ()
void GetTransformedFocalPoint (float &a0, float &a1, float &a2)
void GetTransformedFocalPoint (float a[3])
float * GetTransformedFocalPoint ()
void SetDirectionAngle (float elevation, float azimuth)
void SetDirectionAngle (float ang[2])
void DeepCopy (vtkLight *light)
virtual void SetLightType (int)
virtual int GetLightType ()
void SetLightTypeToHeadlight ()
void SetLightTypeToSceneLight ()
void SetLightTypeToCameraLight ()
int LightTypeIsHeadlight ()
int LightTypeIsSceneLight ()
int LightTypeIsCameraLight ()
void ReadSelf (istream &is)
void WriteSelf (ostream &os)

Static Public Methods

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

Protected Methods

 vtkLight ()
 ~vtkLight ()
 vtkLight (const vtkLight &)
void operator= (const vtkLight &)

Protected Attributes

float FocalPoint [3]
float Position [3]
float Intensity
float Color [3]
int Switch
int Positional
float Exponent
float ConeAngle
float AttenuationValues [3]
vtkMatrix4x4TransformMatrix
float TransformedFocalPointReturn [3]
float TransformedPositionReturn [3]
int LightType

Detailed Description

a virtual light for 3D rendering.

Date:
2000/12/10 20:08:42
Revision:
1.46

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).

Examples:
vtkLight (examples)


Member Function Documentation

void vtkLight::DeepCopy vtkLight *    light
 

Perform deep copy of this light.

virtual const char* vtkLight::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.

Reimplemented in vtkRIBLight.

void vtkLight::GetTransformedFocalPoint float &    a0,
float &    a1,
float &    a2
 

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

void vtkLight::GetTransformedPosition float &    a0,
float &    a1,
float &    a2
 

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

virtual int vtkLight::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.

Reimplemented in vtkRIBLight.

int vtkLight::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.

Reimplemented in vtkRIBLight.

int vtkLight::LightTypeIsHeadlight  
 

Query the type of the light.

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, intensity=1, and the light is turned on.

Reimplemented from vtkObject.

Reimplemented in vtkRIBLight.

void vtkLight::PrintSelf ostream &    os,
vtkIndent    indent
[virtual]
 

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 vtkRIBLight.

virtual void vtkLight::Render vtkRenderer  ,
int   
[inline, virtual]
 

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 vtkRIBLight.

vtkLight* vtkLight::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.

Reimplemented in vtkRIBLight.

virtual void vtkLight::SetAttenuationValues float   ,
float   ,
float   
[virtual]
 

Set/Get the quadratic attenuation constants. They are specified as constant, linear, and quadratic, in that order.

virtual void vtkLight::SetColor float   ,
float   ,
float   
[virtual]
 

Set/Get the color of the light.

virtual void vtkLight::SetConeAngle float    [virtual]
 

Set/Get the lighting cone angle of a positional light in degrees. A value of 180 indicates that you want no spot lighting effects just a positional light.

void vtkLight::SetDirectionAngle float    elevation,
float    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.

virtual void vtkLight::SetExponent float    [virtual]
 

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

virtual void vtkLight::SetFocalPoint float   ,
float   ,
float   
[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().

virtual void vtkLight::SetIntensity float    [virtual]
 

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

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).

virtual void vtkLight::SetPosition float   ,
float   ,
float   
[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().

virtual void vtkLight::SetPositional int    [virtual]
 

Turn positional lighting on or off.

virtual void vtkLight::SetSwitch int    [virtual]
 

Turn the light on or off.

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.


The documentation for this class was generated from the following file:
Generated on Tue Mar 19 13:28:31 2002 for VTK by doxygen1.2.14 written by Dimitri van Heesch, © 1997-2002