[vtkusers] Display Pointcloud in 3d

[David E DeMarle]

You could threshold or contour or use selection by value or volume render
to see the bins.

Or instead of using a vtkImageData you could create a vtkPolyData for the
bins (with one vtkVertex cell per vtkPoint) and assign the hit count to a
scalar array. If you want to convert to vtkImageData afterward you could
use vtkGaussianSplatter to sample onto the cells.

David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909


On Fri, Jan 6, 2012 at 4:55 AM, h0ppel <h0ppel at web.de> wrote:

> Hi,
>
> I do have an example point Cloud and put it into imagedata like this:
>
> int i, j, k;
>
>            int[][][] Matrix;
>            var rand = new Random(100);
>
>            var x = 100; var y = 200; var z = 35;
>            var size = x * y * z * sizeof(int);
>
>            Matrix = new int[x][][];
>
>            for (i = 0; i < x; i++)
>            {
>                Matrix[i] = new int[y][];
>
>                for (j = 0; j < y; j++)
>                {
>                    Matrix[i][j] = new int[z];
>
>                    for (k = 0; k < z; k++)
>                    {
>                        Matrix[i][j][k] = rand.Next();
>                    }
>                }
>            }
>
>            vtkImageData image = new vtkImageData();
>
>            image.SetDimensions(100, 200, 35);
>            image.SetSpacing(1, 1, 1);
>            image.SetOrigin(0, 0, 0);
>            image.SetNumberOfScalarComponents(1);
>            image.SetScalarTypeToFloat();
>            image.AllocateScalars();
>
>            unsafe
>            {
>                int* ptr = (int*)(image.GetScalarPointer());
>
>                for (i = 0; i < 100; i++)
>                {
>                    for (j = 0; j < 200; ++j)
>                    {
>                        for (k = 0; k < 35; ++k)
>                        {
>                            *ptr++ = Matrix[i][j][k];
>                        }
>                    }
>                }}< /raw>
>
> but how can I display this cloud in 3d and not only in the viewer?
>
> thanks
>
> --
> View this message in context:
> http://vtk.1045678.n5.nabble.com/Display-Pointcloud-in-3d-tp5125086p5125086.html
> Sent from the VTK - Users mailing list archive at Nabble.com.
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