Add static image

[kaedonkers]

This project is really awesome, thank you so much! I have been working with rendering numpy arrays of cloud fraction data and getting some really cool visualisations very quickly.

Given that I'm working with geospatial data, it would be really good to put a static image of a map as a background at z=0. Is this possible with this project at the moment?

For example, see the demo from @tpowellmeto in #74 which had a map of the UK in the background:
http://demo.3dvis.informaticslab.co.uk/ng-3d-vis/apps/desktop/

Thanks for any advice.

[thewtex]

@kaedonkers thank you for the encouraging words!

Yes this will be possible. First we will need to complete support for vtk.js PolyData (I am working on this at the moment). Then we can convert the map into a PolyData so it renders correctly and in the correct location in space. We could use a map image. Even better, we could use the elevation data to provide topography for mountains, ...

Do you have some data we can use to create an example?