[vtkusers] vtk transparency problem

[clinton at elemtech.com]

On Friday 20 June 2008 11:46:41 am Tracy Hu wrote:
> I wonder if you could briefly look at my code below? I implemented
> everything as you suggested. But in the resulted two triangles, blue one
> always appear in front of red one no matter how I rotate them. Did I do
> something incorrect? I'm using vtk5.3
>

See attached code (modified from yours) which illustrates the problem that 
this transparency method solves.  Try it with and without the painter that 
does the 2 pass rendering with culling.
This method is not intended to mix colors perfectly, which is what you seem to 
be after.  Its intended to remove some artifacts that you can see if you 
don't use the painter.

Clint
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