Main Page | Class Hierarchy | Alphabetical List | Class List | Directories | File List | Class Members | File Members | Related Pages

vtkLODActor Class Reference

#include <vtkLODActor.h>

Inheritance diagram for vtkLODActor:

Inheritance graph
Collaboration diagram for vtkLODActor:

Collaboration graph
List of all members.

Detailed Description

an actor that supports multiple levels of detail

vtkLODActor is an actor that stores multiple levels of detail (LOD) and can automatically switch between them. It selects which level of detail to use based on how much time it has been allocated to render. Currently a very simple method of TotalTime/NumberOfActors is used. (In the future this should be modified to dynamically allocate the rendering time between different actors based on their needs.)

There are three levels of detail by default. The top level is just the normal data. The lowest level of detail is a simple bounding box outline of the actor. The middle level of detail is a point cloud of a fixed number of points that have been randomly sampled from the mapper's input data. Point attributes are copied over to the point cloud. These two lower levels of detail are accomplished by creating instances of a vtkOutlineFilter (low-res) and vtkMaskPoints (medium-res). Additional levels of detail can be add using the AddLODMapper() method.

To control the frame rate, you typically set the vtkRenderWindowInteractor DesiredUpdateRate and StillUpdateRate. This then will cause vtkLODActor to adjust its LOD to fulfill the requested update rate.

For greater control on levels of detail, see also vtkLODProp3D. That class allows arbitrary definition of each LOD.

If you provide your own mappers, you are responsible for setting its ivars correctly, such as ScalarRange, LookupTable, and so on.

On some systems the point cloud rendering (the default, medium level of detail) can result in points so small that they can hardly be seen. In this case, use the GetProperty()->SetPointSize() method to increase the rendered size of the points.

See also:
vtkActor vtkRenderer vtkLODProp3D
vtkLODActor (Examples)
vtkLODActor (Tests)

Definition at line 75 of file vtkLODActor.h.

Public Types

typedef vtkActor Superclass

Public Member Functions

virtual const char * GetClassName ()
virtual int IsA (const char *type)
void PrintSelf (ostream &os, vtkIndent indent)
virtual void Render (vtkRenderer *, vtkMapper *)
int RenderOpaqueGeometry (vtkViewport *viewport)
void ReleaseGraphicsResources (vtkWindow *)
void Modified ()
void ShallowCopy (vtkProp *prop)
void AddLODMapper (vtkMapper *mapper)
virtual int GetNumberOfCloudPoints ()
virtual void SetNumberOfCloudPoints (int)
virtual vtkMapperCollectionGetLODMappers ()

Static Public Member Functions

static int IsTypeOf (const char *type)
static vtkLODActorSafeDownCast (vtkObject *o)
static vtkLODActorNew ()

Protected Member Functions

 vtkLODActor ()
 ~vtkLODActor ()
virtual void CreateOwnLODs ()
virtual void UpdateOwnLODs ()
virtual void DeleteOwnLODs ()

Protected Attributes

vtkTimeStamp BuildTime
int NumberOfCloudPoints

Member Typedef Documentation

typedef vtkActor vtkLODActor::Superclass

Reimplemented from vtkActor.

Definition at line 78 of file vtkLODActor.h.

Constructor & Destructor Documentation

vtkLODActor::vtkLODActor  )  [protected]

vtkLODActor::~vtkLODActor  )  [protected]

Member Function Documentation

virtual const char* vtkLODActor::GetClassName  )  [virtual]

Reimplemented from vtkActor.

static int vtkLODActor::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 vtkTypeRevisionMacro found in vtkSetGet.h.

Reimplemented from vtkActor.

virtual int vtkLODActor::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 vtkTypeRevisionMacro found in vtkSetGet.h.

Reimplemented from vtkActor.

static vtkLODActor* vtkLODActor::SafeDownCast vtkObject o  )  [static]

Reimplemented from vtkActor.

void vtkLODActor::PrintSelf ostream &  os,
vtkIndent  indent

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 vtkActor.

static vtkLODActor* vtkLODActor::New  )  [static]

Creates a vtkLODActor with the following defaults: origin(0,0,0) position=(0,0,0) scale=(1,1,1) visibility=1 pickable=1 dragable=1 orientation=(0,0,0). NumberOfCloudPoints is set to 150.

Reimplemented from vtkActor.

virtual void vtkLODActor::Render vtkRenderer ,

This causes the actor to be rendered. It, in turn, will render the actor's property and then mapper.

Reimplemented from vtkActor.

int vtkLODActor::RenderOpaqueGeometry vtkViewport viewport  )  [virtual]

This method is used internally by the rendering process. We overide the superclass method to properly set the estimated render time.

Reimplemented from vtkActor.

void vtkLODActor::ReleaseGraphicsResources vtkWindow  )  [virtual]

Release any graphics resources that are being consumed by this actor. The parameter window could be used to determine which graphic resources to release.

Reimplemented from vtkActor.

void vtkLODActor::AddLODMapper vtkMapper mapper  ) 

Add another level of detail. They do not have to be in any order of complexity.

virtual int vtkLODActor::GetNumberOfCloudPoints  )  [virtual]

Set/Get the number of random points for the point cloud.

virtual void vtkLODActor::SetNumberOfCloudPoints int   )  [virtual]

Add another level of detail. They do not have to be in any order of complexity.

virtual vtkMapperCollection* vtkLODActor::GetLODMappers  )  [virtual]

All the mappers for different LODs are stored here. The order is not important.

void vtkLODActor::Modified  )  [virtual]

When this objects gets modified, this method also modifies the object.

Reimplemented from vtkObject.

void vtkLODActor::ShallowCopy vtkProp prop  )  [virtual]

Shallow copy of an LOD actor. Overloads the virtual vtkProp method.

Reimplemented from vtkActor.

virtual void vtkLODActor::CreateOwnLODs  )  [protected, virtual]

virtual void vtkLODActor::UpdateOwnLODs  )  [protected, virtual]

virtual void vtkLODActor::DeleteOwnLODs  )  [protected, virtual]

Member Data Documentation

vtkActor* vtkLODActor::Device [protected]

Definition at line 126 of file vtkLODActor.h.

vtkMapperCollection* vtkLODActor::LODMappers [protected]

Definition at line 127 of file vtkLODActor.h.

vtkMaskPoints* vtkLODActor::MaskPoints [protected]

Definition at line 130 of file vtkLODActor.h.

vtkOutlineFilter* vtkLODActor::OutlineFilter [protected]

Definition at line 131 of file vtkLODActor.h.

vtkTimeStamp vtkLODActor::BuildTime [protected]

Definition at line 132 of file vtkLODActor.h.

int vtkLODActor::NumberOfCloudPoints [protected]

Definition at line 133 of file vtkLODActor.h.

vtkPolyDataMapper* vtkLODActor::LowMapper [protected]

Definition at line 134 of file vtkLODActor.h.

vtkPolyDataMapper* vtkLODActor::MediumMapper [protected]

Definition at line 135 of file vtkLODActor.h.

The documentation for this class was generated from the following file:
Generated on Mon Jan 21 23:59:11 2008 for VTK by  doxygen 1.4.3-20050530