Ideally you could input a threshold of 0.5, however the viewer can't
accept fractional values[sorry]. Try multiplying the image by, say, 2
and setting the threshold to 1.
Dave Flitney, IT Manager
University of Oxford, FMRIB Centre
JR Hospital, Oxford OX3 9DU
T: 01865 222713 F: 01865 222717
On 7 Jan 2011, at 19:09, Courtney Haswell <[log in to unmask]>
wrote:
> Hi,
>
> I am trying to look at a structure (hippocampus) using 3D viewer.
> When I start the 3D viewer, I get the following error message:
>
> "Error: [ch186@cohen cropped_rois]$ ERROR: In /var/tmp/bach-build/
> BUILD/VTK/Graphics/vtkDecimatePro.cxx, line 161
> vtkDecimatePro (0xe4fec20): No data to decimate!
>
> ERROR: In /var/tmp/bach-build/BUILD/VTK/Graphics/
> vtkSmoothPolyDataFilter.cxx, line 212
> vtkSmoothPolyDataFilter (0xe2c4df0): No data to smooth!
>
> ERROR: In /var/tmp/bach-build/BUILD/VTK/Graphics/
> vtkPolyDataNormals.cxx, line 94
> vtkPolyDataNormals (0xe2c4a20): No data to generate normals for!"
>
> Looking back in the archives, it was suggested to change the
> threshold. I have been trying many different numbers but keep
> getting the same error message. I know my 3D viewer works because it
> can load the standard MNI brain just fine.
>
> My image has intensity of 1 where the hippocampus is and 0 for the
> background. What should my threshold be to view this in the 3D viewer?
>
> Thank you,
> Courtney
>
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