[vtkusers] GUI for adjusting volume renderer properties

[Rupert Shute]

Hi,
	Does anyone know of a QT widget (in the public domain) that can be
used to interactively control the opacity and colour transfer functions of a
volume renderer?

The sort of thing that I am looking for is a graph to which points can be
added/deleted and moved around with the mouse. It would be a bonus if a
histogram of the data were incorporated as a background.

Any tips on where to start building my own would also be greatly received.

Regards

Rupert
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