[vtkusers] VTKImageActor->SetZSlice (z) fails to update

[Jothybasu K Selvaraj]

You should be adding your Imageactor to some renderWindow. So, try
RenderWindow->Render().

Jothy

On Mon, Mar 29, 2010 at 3:07 PM, Dr. Philip Julian Broser <
philip.broser at doctors.net.uk> wrote:

> Dear VTK Users,
>
> I am still struggling with updating the zslice in the vtkImageActor
>
>
> I am visualising 3D Volume Data (tiff) using an vtkImageActor:
>
> vtkImageData *FaImage = (correctly loaded 3d volume data, see down below)
>
> vtkImageActor *ImageActor = vtkImageActor::New();
> ImageActor->SetInput (FaImage);
> ImageActor->SetZSlice (2);
>
> The visualisation of the first Zslice works very well.
>
> However my program visualizes 3D Volume MRI data and overlays it with vtk
> meshes of brain structures i.e. the thalmus.
> To check that the structure in the vtk mesh was correctly segmented and
> localized I want to look at single z planes.
> In order to be able to select different planes I have written a simple
> Event Class.
> With every click of the mouse the image plane should shift by one pixel in
> z.
> The first plane is always well visualised and the actor seems to be
> correctly initiated
> but the plane is not updated when a event occurs even so the command
> SetZSlice is called with the new z value.
>
> Does any body have an idea why the image actor is not updated?
>
> Kind regards
>
> Phil
>
>
> class myEventClass : public vtkCommand
> {
>
>
>
> virtual void Execute (  vtkObject *  caller, unsigned long  eventId, void
>  *  callData)
> {
> int max=ImageActor->GetWholeZMax ( );
> int min=ImageActor->GetWholeZMin ( );
>
>
> if (dir==0)
> {
> z=z+1;
> if (z>max ) {z=max;dir=1;}
> }
> else
> {
> z=z-1;
> if (z<min) {z=min;dir=0;}
> };
>
>
> *ImageActor->SetZSlice (z);*
>
>
> cout << "Current z Slice:" << z << endl;
> };
>
> public:
> myEventClass() {
> z=0;
> dir=0;
> }
>
> void SetImageActor(vtkImageActor *iA) {ImageActor=iA;};
>
> private:
> vtkImageActor *ImageActor;
> int z;
> int dir;
> };
>
>
> vtkImageData (0x101022350)
>   Debug: Off
>   Modified Time: 554
>   Reference Count: 3
>   Registered Events: (none)
>   Source: (none)
>   Information: 0x1010224b0
>   Data Released: False
>   Global Release Data: Off
>   UpdateTime: 0
>   Release Data: Off
>   UpdateExtent: Not Initialized
>   RequestExactExtent: Off
>    Field Data:
>     Debug: Off
>     Modified Time: 456
>     Reference Count: 1
>     Registered Events: (none)
>     Number Of Arrays: 0
>     Number Of Components: 0
>     Number Of Tuples: 0
>   Number Of Points: 414720
>   Number Of Cells: 397100
>   Cell Data:
>     Debug: Off
>     Modified Time: 459
>     Reference Count: 1
>     Registered Events: (none)
>     Number Of Arrays: 0
>     Number Of Components: 0
>     Number Of Tuples: 0
>     Copy Tuple Flags: ( 1 1 1 1 1 0 1 )
>     Interpolate Flags: ( 1 1 1 1 1 0 0 )
>     Pass Through Flags: ( 1 1 1 1 1 1 1 )
>     Scalars: (none)
>     Vectors: (none)
>     Normals: (none)
>     TCoords: (none)
>     Tensors: (none)
>     GlobalIds: (none)
>     PedigreeIds: (none)
>   Point Data:
>     Debug: Off
>     Modified Time: 552
>     Reference Count: 1
>     Registered Events: (none)
>     Number Of Arrays: 1
>     Array 0 name = NULL
>     Number Of Components: 1
>     Number Of Tuples: 414720
>     Copy Tuple Flags: ( 1 1 1 1 1 0 1 )
>     Interpolate Flags: ( 1 1 1 1 1 0 0 )
>     Pass Through Flags: ( 1 1 1 1 1 1 1 )
>     Scalars:
>       Debug: Off
>       Modified Time: 452
>       Reference Count: 2
>       Registered Events: (none)
>       Name: (none)
>       Data type: unsigned char
>       Size: 414720
>       MaxId: 414719
>       NumberOfComponents: 1
>       Information: 0
>       Name: (none)
>       Number Of Components: 1
>       Number Of Tuples: 414720
>       Size: 414720
>       MaxId: 414719
>       LookupTable: (none)
>       Array: 0x101100000
>     Vectors: (none)
>     Normals: (none)
>     TCoords: (none)
>     Tensors: (none)
>     GlobalIds: (none)
>     PedigreeIds: (none)
>   Bounds:
>     Xmin,Xmax: (0, 237.5)
>     Ymin,Ymax: (0, 237.5)
>     Zmin,Zmax: (0, 110)
>   Compute Time: 0
>   ScalarType: 3
>   NumberOfScalarComponents: 1
>   Spacing: (2.5, 2.5, 2.5)
>   Origin: (0, 0, 0)
>   Dimensions: (96, 96, 45)
>   Increments: (0, 0, 0)
>   Extent: (0, 95, 0, 95, 0, 44)
>
>
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