How to make camlight work with export_fig?

I want to create high quality pdf images of 3D plots using camlight and export_fig. The following code yields the plot below, but the exported pdf (see attached pdf) file lack the camlight. How do I fix this?

surf(peaks(100),'EdgeColor', 'none')
camlight;
set(gca, 'Color', 'none');
export_fig('../graphics/test', '-png', '-transparent')

Answer 1

[Jon Vegard]

I'm also interested in solutions not involving export_fig.