[vtkusers] Color flickering

[Ken Martin]

Well mappers are always used for rendering. The connections typically go

dataset 1 -> 1 mapper 1 -> 1 actor N -> 1 renderer N -> 1 renderwindow

But if you have two mappers then typically you have two datasets and would
need two writers resulting in two files

Not sure if that answers it for you but hopefully it helps.

Ken


On Fri, Oct 7, 2016 at 9:51 AM, Ruben van Staden <rubenvanstaden at gmail.com>
wrote:

> Hey Ken
>
> Thanks for the reply.
> Is it possible to use mappers and still write to a VTK file using:
>
> vtkSmartPointer<vtkXMLUnstructuredGridWriter> writer = vtkSmartPointer<
> vtkXMLUnstructuredGridWriter>::New();
>
> Regards
> Ruben
>
> On Fri, Oct 7, 2016 at 2:41 PM, Ken Martin <ken.martin at kitware.com> wrote:
>
>> If they are in two different mappers and you are using the new OpenGL2
>> backend, then you can solve it in VTK by calling
>>
>> SetResolveCoincidentTopologyToPolygonOffset();
>> SetRelativeCoincidentTopologyPolygonOffsetParameters(-2,-2);
>>
>> on one of the mappers.  If they are in the same mapper then, you cannot
>> solve it in VTK as the two polygons occupy exactly the same space, but due
>> to driver specific rendering implementations there may be some differences
>> frame to frame in what pixels end up on top.
>>
>> Hope that helps
>> Ken
>>
>>
>>
>>
>>
>> On Fri, Oct 7, 2016 at 7:38 AM, Ruben van Staden <
>> rubenvanstaden at gmail.com> wrote:
>>
>>> Dear Readers
>>>
>>> I have two overlapping polyhedrons that each have a different color.
>>> When I plot them using Paraview, the part of the structure that overlaps
>>> starts flickering as I rotate the structure. Almost like the program is
>>> confused
>>> to what coloring to add to that part, since they overlap.
>>>
>>> Is there a way to solve this, somehow using VKT, or will I have to
>>> do polyhedron boolean operations?
>>>
>>> Regards
>>> Ruben
>>>
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>>
>>
>> --
>> Ken Martin PhD
>> Chairman & CFO
>> Kitware Inc.
>> 28 Corporate Drive
>> Clifton Park NY 12065
>> 518 371 3971
>>
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>
>


-- 
Ken Martin PhD
Chairman & CFO
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065
518 371 3971

This communication, including all attachments, contains confidential and
legally privileged information, and it is intended only for the use of the
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