Thanks very much!
I see that you ran into a similar issue for showing text in pict3d... I found the die-cut library which I hoped could be used for text, but couldn't make it work in time... I think if you want a proper overlay, it might be necessary to render to canvas, the overlay that...
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As far as I know, there is no way (at this point) to texture things. This guy wanted to do it as well, and was starting to come to the conclusion that it might be easier to just use OpenGL directly. I'm not /quite/ there yet (being able to import from Blender helped a lot), but it's a pretty basic feature and it's frustrating not to have it.