[vtkusers] Opacity with multiple meshes

[Nicolas Rannou]

Thanks for the suggestions I'm giving it a try!

I'll use depth peeling since I need the objects to remain distincts and it
looks more straight forward.
It looks like I should also set "renderWindow->SetAlphaBitPlanes(1)"

On Thu, Jan 26, 2012 at 3:18 PM, David E DeMarle
<dave.demarle at kitware.com>wrote:

> And since you have multiple meshes, for depth sort to work, you need to
> append them all together first, then depth sort that. Otherwise the opacity
> is only correct within each one, not amongst them.
>
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909
>
>
> On Thu, Jan 26, 2012 at 3:13 PM, David E DeMarle <dave.demarle at kitware.com
> > wrote:
>
>> Use depth peeling.
>> http://www.vtk.org/Wiki/VTK/Depth_Peeling
>>
>> Or vtkDepthSortPolyData before rendering.
>>
>> David E DeMarle
>> Kitware, Inc.
>> R&D Engineer
>> 21 Corporate Drive
>> Clifton Park, NY 12065-8662
>> Phone: 518-881-4909
>>
>>
>> On Thu, Jan 26, 2012 at 3:10 PM, Nicolas Rannou <nicolas.lists at gmail.com>wrote:
>>
>>> Hello,
>>>
>>> I have several meshes I want to visualize.
>>>
>>> If I decrease the opacity of those meshes, the visualization goes wrong:
>>> I don't see a nice "superposition effect", instead I only see the "last"
>>> object "in the ray".
>>>
>>> Decreasing the opacity,
>>> - paraview has the expected behavior
>>> - the vtk example (
>>> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/Opacity) has the
>>> wrong behavior.
>>>
>>> I could find which option to use to enable a proper behavior...
>>>
>>> Thanks,
>>> Nicolas
>>>
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