The following snippet doesn't seem to do anything after the volume was rendered.
volume.colortable.file = file;
volume.modified();
r.render();
Also, placing volume.colortable.file = file; after r.add(volume) causes a "y is undefined" error.
The latest xtk_edge.js was used.
That's right. The color table need to be attached during parsing to properly configure the texture of the volume/labelmap. There is also no easy way around that in my eyes.