[vtkusers] proper use of vtkStructuredPoints in C++ for vtkVolume ?

[jean-charles campagne]

hello,

i'm trying to generated a volume
(vtkVolumeRayCastMapper) out of structured points in
C++.

But i am having troubles specifying the points
manually (eg from an array of integers or float).

Can someone illustrate the use of vtkStructuredPoints
(specifying points/dimensions/... manu)?

this is the source of the program i'm trying to write
correctly. It fails miserably at the rendering phase.
i'm guessing i'm missing or mis-initializing
something... but i'm not sure what... 
-----------------------------------------
#include "vtkRenderWindow.h"
#include "vtkCamera.h"
#include "vtkActor.h"
#include "vtkRenderer.h"
#include "vtkStructuredPoints.h"
#include "vtkVolumeRayCastMapper.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkPoints.h"

int main( int argc, char *argv[] )
{
	vtkPoints *points = vtkPoints::New();
	vtkVolumeMapper *volumeMapper =
vtkVolumeRayCastMapper::New();
	vtkVolume *volume = vtkVolume::New();
	vtkRenderer *ren1= vtkRenderer::New();
	vtkRenderWindow *renWin = vtkRenderWindow::New();
	
	
	vtkStructuredPoints *structuredPoints =
vtkStructuredPoints::New();

	structuredPoints->SetSpacing(1.0,1.0,1.0);
	structuredPoints->SetScalarType(VTK_UNSIGNED_SHORT);
	structuredPoints->SetDimensions(2, 2, 2);
	structuredPoints->SetNumberOfScalarComponents  	(1);
 
structuredPoints->SetUpdateExtent(-100,100,-100,100,-100,100);
 
structuredPoints->SetExtent(-10,100,-100,100,-100,100);
	//setting points
	const int n = 5;
	for (int i=0; i<n; i++) {
		for (int j=0; j<n; j++) {
			for (int k=0; k<n; k++) {
				structuredPoints
					->SetScalarComponentFromFloat (i, j, k, 0, 1.0);
			}
		}
	}
	volumeMapper->SetInput(structuredPoints);
	volume->SetMapper(volumeMapper);
	ren1->AddVolume(volume);
 	
	ren1->SetBackground( 1.0, 1.0, 1.0 );
	renWin->AddRenderer( ren1 );
	renWin->SetSize( 300, 300 );
	renWin->Render();
	
	return 0;
}


-----------------------------------------

many thanks
JCC



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