[vtkusers] add a new dimension

[shirani kannangara]

Dear David,

I want to add a new dimension for a vtk imge( Visible human abdomen).Is
this facility available in VTK?As I see three dimensions are already used
for color(RGB) and the fourth one for opacity.Am I correct? I am highly
appreciated if you could direct me to add a new dimension to vtk image.

regards
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