[vtkusers] Transparant polydata

[Kevin Wright]

At 05:22 PM 9/19/2002 +0200, you wrote:
>AFAIK this is not possible. When you pipeline your vtkPolyData through a 
>vtkPolyDataMapper and finally a vtkActor, there is just one vtkProperties 
>associated with the actor where you can set the opacity.
>
>We too have a dataset with windows in it (actually it is a building) and 
>we will put walls and windows in different actors. If you find an other 
>way please let me know.
>
>chris
>
>Koning, P.J.H. de (LKEB) wrote:
>>Is it possible to change the opacity of a single triangle in vtkPolyData?
>>I want to create somthing like a 'window' in a polydata object and change 
>>the opacity of that 'window'.

If you want the cells to disappear completely, could you reverse the 
normals, and turn on backface culling?

Kevin.