[vtk-developers] allow transparency in vtkImageAppend

[Dominik Szczerba]

Hi David,

Will this do?

Note: I based my patch on the official 5.6.1 version, now I see that
git version has vtkImageAppendGetContinuosIncrements versus
vtkImageAppendGetContinuousIncrements - note the exact spelling. I was
not sure which one to preserve so please verify this one in the
attached patch.

Best regards,
Dominik

On Wed, Jun 15, 2011 at 10:35 PM, David E DeMarle
<dave.demarle at kitware.com> wrote:
> Sorry for the late reply Dominik.
> That feature sounds great. Please do send or point me to the patch and I
> will commit it. If possible, prepare the patch with git, so you keep credit
> in the log.
> thanks,
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 28 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-371-3971 x109
>
>
> On Sat, May 28, 2011 at 6:41 AM, Dominik Szczerba <dominik at itis.ethz.ch>
> wrote:
>>
>> Hi,
>>
>> I am appending multiple image blocks using vtkImageAppend. I need to
>> use PreserveExtents = 1. My image blocks are overlapping and in some
>> cases undesired overwriting takes place, e.g. when one of the blocks
>> needed to be rotated/resampled. I am aware I could by hand create a
>> target canvas of appropriate size and use vtkImageMathematics with
>> proper masks, but that's just so much more coding and likely also much
>> performance overhead. What I have done is added concept of
>> transparency to the said vtkImageAppend, such that copying the data
>> only takes place if the value is not declared transparent (integer) or
>> does not lie within a range declared as transparent (floating).
>>
>> I was wondering if this could be merged with the current development
>> version. If yes, I can provide a (very simple) patch along with a test
>> data.
>>
>> Best regards,
>> Dominik
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