[vtkusers] Fast vtk Rendering

[Kim Chuan Lim]

Dear vtk users,

I have modified the examples program at 
Examples/Medical/Tcl/Medical3.tcl by 
adding more vtkActor of the same headsq
(rendering 3 headsq in color mode at the same time).
The speed of refreshing/rendering has become very slow.
I try to calculate the time of each rendering by using vtkTimer 

timer1 start 
renWin render
timer1 stop

The result time is up to 1 sec which is very slow and unacceptable.

Is there anyway to improve the speed of rendering?
What is the reason it take such a long time for each render?

I suspect that the chain updating for vtkVolumeReader16, 
vtkContourFilter, vtkPolyDataNormal, vtkPolyDataMapper, and 
vtkRenderer are giving the problem. Is there anyway to disable the 
chaining?

What does vtkSource::ReleaseDataFlagOn really do? Will this stop 
the chaining by set this to On?

Thanks in advance.

Best Regards,
Kim Chuan.

PS:
My computer spec: Linux mandrake 10.1 with P4 3GHz, 2GB RAM, geforce4 MX.
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