[vtkusers] Grid overlay on 3D view n world coordinates

[normanius]

For custom behaviour of the scene, you might want to derive your own
interactor, as shown in  Mouse Events example
<https://cmake.org/Wiki/VTK/Examples/Cxx/Interaction/MouseEvents>  . You can
then forward those events to your grid object that you actually want to
handle.

VTK also supports callbacks to intercept a certain user event. You can read 
here <http://www.vtk.org/Wiki/VTK/Tutorials/Callbacks>   how this works. A
list of commands is found in the documentation of  vtkCommand
<http://www.vtk.org/doc/nightly/html/classvtkCommand.html#details>  .

How do you create grid lines? Similar to the  StructuredDataTypes example
<http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/StructuredDataTypes> 
?

I hope this was useful.





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