Depth of Field

[Erikvdb]

Hi all,
Recently I've played around with the viz.postprocess module a bit, the effects of which are applied to entire screen. However, I am now looking to exclude some foreground objects from the getting blurred. Is that possible? You could describe it as a sort of depth of field, although I don't really need an accurate gradual blurring effect; just blur or no blur (per object).

I guess I should be looking into writing shaders, but for now that seems absolute wizardry to me