[vtkusers] Actors dissapear on interaction

[davidlandry93]

Hello all,

I'm working on a visualization combining a point cloud with many ellipsoids.
In the current state of things the visualization works correctly until I
click on it and try to interact. At that point, everything disappears except
the orientation marker widget. 

I don't think the problem is a violent camera movement that takes all the
objects out of sight, because I tried with many interactors and small 
movements.

The most relevant code is  here
<https://github.com/davidlandry93/pclem/blob/527f346ea2c5b1c4a19323f3bfe21e52aacc559f/pclem_vtk/src/vtk_visualization.cpp>  

The header of that class is  here
<https://github.com/davidlandry93/pclem/blob/527f346ea2c5b1c4a19323f3bfe21e52aacc559f/pclem_vtk/src/vtk_visualization.h>  

Feel free to browse around the repo if some informations are missing.

I run this code on linux.

Thanks in advance for all the help,

David Landry



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