[vtkusers] Is there a concept of "empty" data?

[Goodwin Lawlor]

Hi Phil,

Have a look at vtkStructuredGrid and its cell or point "blanking"

hth

Goodwin

Phil Goddard wrote:
> Is there the concept of "empty" data within VTK?
> 
> Specifically, I have points that are defined on a rectangular grid, and
> would like to use vtkImageData for its efficient use of memory.
> However my image does not have values at all points of the grid.
> 
> I'm used to using an application (MATLAB) where if an element of my data is
> set to NaN (which is an IEEE standard for Not a Number -- i.e. a placeholder
> in a numeric array that is not a number) then that point does not get
> visualized and no adjacent points will get drawn as connecting to that
> point.
> Is there a similar concept with VTK?
> 
> I think I have to resort to using vtkPolyData or vktUnstructuredData, but
> want to check that I'm not missing something with regards to vtkImageData
> first.
> 
> Thanks
> Phil.
> 
> 
> 
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