You need to create the figure outside of the camera and pass it in.  There's an example here:

http://yt-project.org/docs/dev/cookbook/complex_plots.html#volume-rendering-with-annotation

On Aug 19, 2015 12:59 AM, "John Regan" <johnanthonyregan@gmail.com> wrote:
Hi All,

Just wondering if there is a way to annotate a volume render with scale lines, text etc? From (quickly) looking at the source it looks like the annotate function only adds a colorbar and doesn't have the flexibility to add other labels?

Cheers,
John

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