2013/1/31 Tobias Knerr <[email protected]> > > I think you are overlooking several problems. To start with, > building:part cannot do arcing structures - like many bridge decks. They > can also not easily to structures that become wider or narrower towards > the top - like some bridge piers. >
Anything more complicated than prisms for piers and areas for bridge decks is not a problem to be solved in openstreetmap IMHO. That is a job for 3D building models in other databases. > Also note that "Simple 3D Buildings" doesn't have an established > solution for ways on top of the roof yet. With normal buildings, that's > a niche use case that would be good for, say, gardens or parking areas > on the roof. But if you think of bridges as buildings (a style of > thinking I'm not particularly comfortable with), this is essential, as > you almost always have highways/railways on top of the "roof" then. > I think that connecting a road with the bridge area (with sharing nodes) is enough to tell the renderer that a road is on this plane. For the record, the height of a building mapped according to "Simple 3D > Buildings" is always based off the point where terrain is the lowest. I am thinking that this could deserve it's own type=bridge (instead of type=building) tag for a relation. It would help renderers make unique rules for rendering bridges. We could put specialized tags on piers like pier:top=arch, pier:top:width=3, or who knows what else. Janko Mihelić
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