[vtkusers] 3D object transformation

[shayan moradkhani]

hi,
i have been following this link:
https://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/TransformPipeline

unfortunately i cant figure out how this transformations are working, why
transformation happens with mouse input, and how to make it
mouse-independent.
if anyone has an idea, that would be very nice.
i can see that using SetCenter positions the objects. how can i control this
using either arrow keys or a timer?(i found a python example but cant figure
out how c++ version would be) 



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