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

[Dr. Philip Julian Broser]

I tried that but it does not change the behavior of the program.

But interestingly when I am compiling and using the software on a  
machine running Mac OSX10.4 the slice updates without any problem,

but when I am using 10.6 the problems starts.

Does any body know anything about any buck on 10.6?

On Mar 29, 2010, at 5:19 PM, Jothybasu K Selvaraj wrote:

> 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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