you'll have to model it if you want thickness to the tiles because
autocad doesn't do displacement/bump mapping. But if your not bothered
about that then you could always map a pic of roof tiles onto the roof
no problem (I will look pretty crap though if your rendering in autocad
no matter what you do).
bump mapping adds bumps to maps only, NOT your geometry, so in this case
you can make the map of the tiles have more shadows and generally look
more 3Dish, but it will not change the geometry, like displacement
mapping in other programs such as 3ds max would, so the ridge and gutter
lines of your roof will still look flat.
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