thanks so much everybody,

i will try again, especially the creasing sounds good to me. what i'm still wondering about though, i've downloaded the model of a wall with a gothic window in it - forgot by whom it was, really neat anyway - and it clearly looks like it's been subdivided, like it has all those very very small polygons, and still it renders totally flat and straight, like a wall should. could i achieve this maybe by just adding vertices and edges within my models per hand ? or else, what about this triangulating command within c2 ? would that make my models look better ? see if i don't do something like subdividing, if i export the models as OBJ to let's say poser for instance, they render with strange disturbances, especially at the edges, and it looks like they've split up in triangle polygons all by themselves which even cast shadows... know what i mean ?
thanks again !