[OSM-dev] [GSoC] Sharing models web application info

[Peter Wendorff]

Hi Kristijan,
(next try, thunderbird unfortunately encrypted the previous attempt,
might have overseen that - if it's not a bug in the Thunderbird UI).

Am 24.03.2015 um 23:28 schrieb Kristijan Trajkovski:
> [...]
> As for scale conversions i think that the main issue would be to find
> out the correct scale based on user's input, so perhaps it would be the
> best to provide a unit standard (for example 1 blender unit = 1 meter)
> and in this way we can defer the required scale to 3d modellers instead
> of trying to guess or approximate scale.

Scaling isn't the only factor, and a robust solution should cope with at
least some sort of changes of the OSM data:

A building may be corrected in its dimensions (half a meter more or less
are often difficult to map).
Therefore the model might need some sort of reference points on the
ground to be matched to the building polygon.

Even if you don't look that deep, it should IMHO be possible to use the
same model for different buildings, thus rotation is a must.

Overall, it follows that the matching from osm building to 3d model
needs some way to define:
- which model (e.g. by model id)
- which orientation (nodes of the osm polygon/multipolygon to reference
nodes on the model

Even harder it's for street lamps, post boxes and stuff like that as
they are mapped as a node only, while the mapping might require an
orientation of the model.

regards
Peter