[vtkusers] How to set data programmatically...

[Theodore Holden]

Hi,

I have an 3d visualization application which reads data from a file which isn't related to vtk and at present I'm having to write the data out in vtk format to disk and then let a vtk reader read it a second time.  

It would help considerably if I was able to simply pass the data to vtk internally but thus far I've not been able to figure out how to do it and nothing I see on the web helps.  The data is unsigned char and the piece of code which presents it looks like this:


       void AddBagVolumeToWindow4(vtk.vtkRenderWindow renWin)
        {
            // 3d texture map
            vtkStructuredPointsReader reader = new vtkStructuredPointsReader();

            vtkVolume volume = new vtkVolume();
            vtkVolumeProperty volumeProperty = new vtkVolumeProperty();

            vtkRenderer renderer = new vtkRenderer();
            vtkRenderWindowInteractor interactor = new vtkRenderWindowInteractor();
            vtkVolumeTextureMapper3D volumeMapper = new vtkVolumeTextureMapper3D();
            //vtkVolumeRayCastCompositeFunction compositeFunction = new vtkVolumeRayCastCompositeFunction();
            
            vtkPiecewiseFunction opacity = new vtkPiecewiseFunction();
            vtkColorTransferFunction color = new vtkColorTransferFunction();

            reader.SetFileName("c:\\zz.vtk");
            reader.Update();

            opacity.AddPoint(0, 0);
            opacity.AddPoint(64, .005);
            opacity.AddPoint(128, .01);
            opacity.AddPoint(200, .05);
            opacity.AddPoint(220, .4);

            color.AddRGBPoint(64, .665, .84, .88);
            color.AddRGBPoint(128, 0, .746, .95);
            color.AddRGBPoint(220, 0, 1, 0);
            color.AddRGBPoint(230, 1, 0, 0);

            volumeProperty.SetColor(color);
            volumeProperty.SetScalarOpacity(opacity);
            volumeProperty.SetInterpolationTypeToLinear();
            volumeProperty.ShadeOn();

            volumeMapper.SetInput(reader.GetOutput());

            //int[] iiex = reader.GetOutput().GetExtent();

            volume.SetMapper(volumeMapper);
            volume.SetProperty(volumeProperty);

            renderer.SetBackground(1, 1, 1);
            renderer.AddVolume(volume);

            interactor.SetRenderWindow(renWin);
            renWin.AddRenderer(renderer);

            renx = renderer;
            volx = volume;           

            renWin.Render();
            interactor.Start();

            vtk.vtkWin32OpenGLRenderWindow win32win =
                vtk.vtkWin32OpenGLRenderWindow.SafeDownCast(renWin);
            win32win.Clean();

        }

That's after the data has been written out to "c:\\zz.vtk" of course.  What it looks like I'd want to do, rather than use the vtkStructuredPointsReader, is to set up my own vtkStructuredPoints object something like:

            vtkStructuredPoints bsp = new vtkStructuredPoints();
            bsp.SetScalarTypeToUnsignedChar();
            bsp.SetDimensions(Width, Height, NumSlices);
            bsp.SetOrigin(0, 0, 0);
            bsp.SetExtent(0, Width - 1, 0, Height - 1, 0, NumSlices - 1);

 and then set the data array but, again, I've no clue as to how to do that.  Any help would be apreciated.


Ted


      
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