[vtkusers] Move STL model and colormap it

[ghy]

I have read your snippet code. 
I just wander why you using a Timer to control your dynamic color mapping
instead of several interact events such as LeftButtonPressEvent,
LeftButtonReleaseEvent, especial MouseMoveEvent. 
I suggest that you should better enable color mapping refresh when a
LeftButtonPressEvent happens, and turn off the color mapping refresh when a 
LeftButtonReleaseEvent happens. Your pipeline should using
vtkElevationFilter to map points positions to scalar dataset every time when
the EentID = MouseMoveEvent occurs. 

Hope it will help.

Susan.
 



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