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

[Richard Frank]

Hi,

We want to make a grid with 10 mm ( world coordinates) lines over our 3D view in parallel projection mode.

We want the grid to respond to the camera zoom ( I.e. Lines every 10 mm, so when camera moves +Z lines are farther apart ) but not to rotation. 

We've tried a few things like vtkfollower and etc but nothing seems to fit well. 

Is there a known way to do what we want? The grid around the box of the actor is nice, but our client wants the stationary grid.

Thanks

Rick

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