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/*=========================================================================
Program: Visualization Toolkit
Module: vtkProp3DFollower.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
// .NAME vtkProp3DFollower - a vtkProp3D that always faces the camera
// .SECTION Description
// vtkProp3DFollower is a type of vtkProp3D that always faces the camera.
// More specifically it will not change its position or scale,
// but it will continually update its orientation so that it is right side
// up and facing the camera. This is typically used for complex billboards
// or props that need to face the viewer at all times.
//
// Note: All of the transformations that can be made to a vtkProp3D will take
// effect with the follower. Thus, if you change the orientation of the
// follower by 90 degrees, then it will follow the camera, but be off by 90
// degrees.
// .SECTION see also
// vtkFollower vtkProp3D vtkCamera vtkProp3DAxisFollower
#ifndef vtkProp3DFollower_h
#define vtkProp3DFollower_h
#include "vtkRenderingCoreModule.h" // For export macro
#include "vtkProp3D.h"
class vtkCamera;
class vtkMapper;
class VTKRENDERINGCORE_EXPORT vtkProp3DFollower : public vtkProp3D
{
public:
// Description:
// Creates a follower with no camera set.
static vtkProp3DFollower *New();
// Description:
// Standard VTK methods for type and printing.
vtkTypeMacro(vtkProp3DFollower,vtkProp3D);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Set/Get the vtkProp3D to control (i.e., face the camera).
virtual void SetProp3D(vtkProp3D *prop);
virtual vtkProp3D *GetProp3D();
// Description:
// Set/Get the camera to follow. If this is not set, then the follower
// won't know what to follow and will act like a normal vtkProp3D.
virtual void SetCamera(vtkCamera*);
vtkGetObjectMacro(Camera, vtkCamera);
// Description:
// This causes the actor to be rendered. It in turn will render the actor's
// property, texture map and then mapper. If a property hasn't been
// assigned, then the actor will create one automatically.
virtual int RenderOpaqueGeometry(vtkViewport *viewport);
virtual int RenderTranslucentPolygonalGeometry(vtkViewport *viewport);
virtual int RenderVolumetricGeometry(vtkViewport *viewport);
// Description:
// Does this prop have some translucent polygonal geometry?
virtual int HasTranslucentPolygonalGeometry();
// Description:
// Release any graphics resources associated with this vtkProp3DFollower.
virtual void ReleaseGraphicsResources(vtkWindow*);
// Description:
// Generate the matrix based on ivars. This method overloads its superclasses
// ComputeMatrix() method due to the special vtkProp3DFollower matrix operations.
virtual void ComputeMatrix();
// Description:
// Shallow copy of a follower. Overloads the virtual vtkProp method.
void ShallowCopy(vtkProp *prop);
// Description:
// Return the bounds of this vtkProp3D.
virtual double *GetBounds();
// Description:
// Overload vtkProp's method for setting up assembly paths. See
// the documentation for vtkProp.
void InitPathTraversal();
virtual vtkAssemblyPath *GetNextPath();
protected:
vtkProp3DFollower();
~vtkProp3DFollower();
vtkCamera *Camera;
vtkProp3D *Device;
//Internal matrices to avoid New/Delete for performance reasons
vtkMatrix4x4 *InternalMatrix;
private:
vtkProp3DFollower(const vtkProp3DFollower&); // Not implemented.
void operator=(const vtkProp3DFollower&); // Not implemented.
};
#endif
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