It would be great to be able to take relief photographs of  real-world 
objects and then have them easily converted into heightfields.

The easiest way, for things like brick walls, is to convert the image to 
gray scale, perhaps invert the tones, maybe adjust the contrast, and then go 
with it.  But this can lead to strange things happening in some cases, and 
it generally only tends to work (using the term loosely) for things like 
brick walls, pavement, etc.

I know that there are "shape from shading" filters which can be applied to 
The Gimp, but they don't exactly look like a no-brainer.  Has anyone tried 
this approach?

Basically, any advice on this subject would be appreciated.

Thanks.

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