[vtkusers] vtk.js: display particular cells with alpha/transparency/opacity

[Raimonds Vilums]

I tried and got

index.js:441 Uncaught (in promise) TypeError: Cannot add property 3, object
is not extensible
    at Object.publicAPI.rGBAToRGBA (index.js:441)
    at Object.publicAPI.convertToRGBA (index.js:487)
    at Object.publicAPI.mapScalars (index.js:238)
    at Object.publicAPI.mapScalars (index.js:272)



On Thu, Dec 13, 2018 at 6:10 PM Sebastien Jourdain <
sebastien.jourdain at kitware.com> wrote:

> You should be able to have an array with 4 components (RGBA)
>
> On Thu, Dec 13, 2018 at 9:01 AM Raimonds Vilums <
> raimonds at cenos-platform.com> wrote:
>
>> Hi,
>>
>> Is it possible to display cells with custom opacity for each cell?
>>
>> Till now, I managed
>> 1) set opacity to the actor (e.g., actor.getProperty().setOpacity(0.5))
>> 2) color cells with solid colors, e.g:
>>
>>
>>    - vtk file contains CELL_DATA array of floats with 3 components for
>>    every color
>>    -
>>
>>    mapper.setColorModeToDirectScalars();
>>
>>    -
>>
>>    mapper.setScalarModeToUseCellFieldData();
>>
>>    -
>>
>>    mapper.setColorByArrayName('my_cell_data');
>>
>>
>> But I could not find a way to set alpha/opacity/transparency for
>> particular cells.
>> Is it possible?
>>
>> Regards,
>> Raimonds
>>
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