[vtkusers] Rendering slow with many actors

[JBK]

I have experienced similar issues.  I do a lot of scatter plotting where 
I use an actor for each point in a 3D scatter plot.  However, I would 
like to be able to independently control the color, size, orientation, 
and transparency of each actor/point.

I see that you have proposed a way to deal with the coloring of the 
actors, but could something similarly be done to control the size, 
orientation, and transparency of each actor/point independently, while 
also speeding up the rendering through the use of something like 
vtkAppendFilter?

Thanks,
Josh