[vtkusers] was: isosurfaces disappears from renderer

[Tatti Emanuele]

After some tries i found the problem: i cannot render the same 
isosurface on different renderers on the same time; i don't know if this 
is normal or not, but this problem occurs with mesa or opengl, on 
windows and linux.
In my case i'm trying to add it to a 3d and to 3 vtkimageviewer2; the 
isosurface appears only in the first renderer in which i add it and non 
in the other 3, but finally it disappears after few resizes or 
refreshes, no errors on output. How can i solve this problem without 
wasting too memory?

thanks

ps. sorry for my english