Customizable Engraved Image Shade

Inspired by Van Alles Wat's [interactive lampshade design project](http://www.thingiverse.com/thing:288447), this customizable design allows you to upload an image to engrave onto the surface of a cylinder. By default, the cylinder is shaped like an Ikea Lampan shade, but you can adjust its size and proportions, as well as the depth of the engraving and a few other settings.

Works best with [depth maps](https://www.google.com/search?q=3d+depth+map&tbm=isch) or designs drawn in black and white. Pixel values are translated to depth of relief, so dark pixels are deeply recessed and white pixels are not.

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Default output is a solid model intended to be printed with no infill and no top (for a vase-like object) or no top and no bottom (for a lampshade). Tom Burtonwood has written a [useful guide](http://learn3dprinting.co/?page_id=160) for doing this with Makerware.

Alternatively, you can specify a fixed inner radius, for variable thickness walls - kind of like a vertical [lit