[vtkusers] render oder of transparent object

[Amy Squillacote]

In order for your rendering to look correct, the polygons in your 
scene must be rendered in the correct order.  First, make sure that 
the actor(s) for the transparent isosurface(s) is/are added 
last.  You may also need to use the vtkDepthSortPolyData 
(http://www.vtk.org/doc/nightly/html/classvtkDepthSortPolyData.html) 
filter, which sorts the polygons for a particular actor along the 
view direction.  You could also try turning on back-to-front 
rendering in the culler of the vtkRenderer (as shown below).  (By 
default, the first culler in a vtkRenderer is a 
vtkFrustumCoverageCuller, and this is the culler that provides the 
SetSortingStyle methods.)

vtkRenderer ren
set cullers [ren GetCullers]
cullers InitTraversal
[cullers GetNextItem] SetSortingStyleToBackToFront

- Amy

At 05:44 AM 4/23/2006, lzyhm wrote:
>I am having some troubles with object rendering order. I displays 
>some transparent isosurfaces in a render window. But from all view 
>angle, the blue object is on top. If the objects isn't transparent, 
>the order is correct. The blue object is added at last. why? help 
>me. The result picture is attached.
>
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