[vtkusers] vtkPolyDataMapper is an abstract class?

[Jochen K.]

Hi Mathieu,

a class containing virtual functions doesn't mean in general, it's a pure
abstract class. Looking into vtkPolyDataMapper.cxx you'll see, that some
functions are implemented, others not.

Modifying a function with the keyword /virtual/ allows this function to be
overridable.

with kind regards
Jochen

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