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

[Sebastien Jourdain]

Can you do a codepen and share it so I can see what you are doing exactly?

On Thu, Dec 13, 2018 at 9:26 AM Raimonds Vilums <raimonds at cenos-platform.com>
wrote:

> 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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