I was approached twice with the question whether we offer colormaps/bars. In the overlay manager you can add/remove colorbars. However they are just dummy ones not connected to real nodes.
In my opinion the main questions/todos would be:
- Would it be of general interest to push the topic forward
- Are there some new insights / developements I am not aware of (@kalali mentioned the work of @jungsi)
- How to create a colorbar only for the topmost node
- How to handle interactions with other plugins
- Best loation for handling the respective code (since it involves interaction with VTK / vtkLookupTables etc)