[vtk-developers] vtkDataObject::DataHasBeenGenerated doesn't call this->Modified()

[John Biddiscombe]

I'm not certain (writing from memory), but is it not the case that if a
filter "Updates", but actually doesn't need to because it's already
up-to-date, then there's no need to set Modified on the outputs. The outputs
will be "modified" if the filter execute method actually changes anything in
them.

ignore this if that part of the update loop is actually skipped for a filter
that's already up to date. I'm just pondering alound.

JB

-----Original Message-----
From: Charl P. Botha [mailto:c.p.botha at its.tudelft.nl]
Sent: 11 March 2003 17:08
To: VTK Developers
Subject: [vtk-developers] vtkDataObject::DataHasBeenGenerated doesn't
call this->Modified()


Dear list,

Is there any reason why vtkDataObject::DataHasBeenGenerated does not
call this->Modified()?  DataHasBeenGenerated() is called for all output
objects by a vtkSource when its UpdateData() has sucessfully executed. 
Surely if this is the case, Modified() should be set on the output
DataObjects as the data that they encapsulate has been changed?

Any information on this would be greatly appreciated.

Thanks,
Charl

-- 
charl p. botha http://cpbotha.net/ http://visualisation.tudelft.nl/
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