[vtkusers] Question: best way to visualize multiply translucent surfaces in vtk

[Feng Ma]

Hi,

  I am new to vtk. I am working on a small project to visualize multiply 
translucent surfaces using vtk. The requirement is to display/interact 
multiply surfaces (translucent or opaque). My questions are:

  1. In order to rotate multiple surfaces together, I could create multiple 
actors and add them to vtkAssembly. Or I could create multiple polydata,  
add to vtkAppendPolyData, and create one mapper and one actor from 
vtkAppendPolyData. I think the advantage of vtkAppendPolyData is that I 
could use vtkDepthSortPolyData to deal with translucent surfaces. And it 
will be easier to use vtkAssembly if I want to do picking ( to delete/change 
surfaces properties later). Is there a way that I could do both ( picking 
and depth sorting)?

  2. If I will add volume rendering to the same renderer, what is the better 
solution to allow both picking and depth sorting (along with volume 
rendering)?

  thanks a lot.

-Feng

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