Allow user-defined colormaps?

[gcerutti]

Hi,

First of all thank you for the awesome work on interfacing dash and VTK! Coming from the Python world, I was really impressed how smoothly I could move from my usual Python vtk tools to dash_vtk (thanks for that utils module ;) )

I was wondering if there could be an easy way for users to introduce their own custom colormap presets in a Representation, something I can imagine a lot of people would want to do at some point... (No matter how many options are available, I guess there will always be THAT crucial one missing...)

Would it be possible to go beyond the provided list, or is it a limitation that comes already from vtk.js? I'm thinking of a simple syntax reflecting the presets definition like this one:

view = dash_vtk.View(
    dash_vtk.GeometryRepresentation(
        children=[...],
        colorMapPreset= {
            'ColorSpace' : 'RGB',
            'Name' : 'gray',
            'RGBPoints' : [0, 0, 0, 0,
                           1, 1, 1, 1]
        }
    )
)

But there might be other options... I was expecting to have such an option through the mapper argument of the Representation, being used to do a mapper.setLookupTable, but I failed to find out how exactly the colormap information is passed to the mapper...

Thank you!

[jourdain]

Thanks for your kind words and we can surely support what you are suggesting. Do you want to make a PR to support either String(name) or Object(presetObj) and just skip the lookup if object here.

[quentco]

Hi,
I am having the same issue. Having that option to input a custom colormap preset would be very useful.
Thank you!