[vtk-developers] Transparency refresh speed

Federico Milano fmilano at gmail.com
Thu Nov 18 09:56:58 EST 2010


Hi,

I'm developing a couple of ParaView plugins and the results produced by
these plugins are best seen adjusting the ParaView "opacity" attribute, that
is, with semi-transparency. The problem I find is that when I rotate the
camera while viewing a transparency the movement is not smooth, that is, the
transparency is lost while moving the camera or the movement blocks while
ParaView is doing some work. I'm dealing with 60000-80000 triangles here and
if I export and visualize the results with Amira <http://www.amira.com/> (I
did it for testing purposes..I want to use ParaView as my visualizer) the
transparencies refresh in a beautiful and smooth way. The questions are:

1)  Is this transparency behavior normal in VTK/ParaView?
2) What's the cause of this behavior, is it the sorting of the triangles?
3) What are the options to fix it? Even if I have to dedicate some man hours
to it, I prefer to fix and then contribute the code.

Any answer will really appreciated!

Thanks in advance,

Federico
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