[GRASS-dev] more about 3d polygons and TINs

[G. Allegri]

I've read the long interesting discussion about 3d-polygons and TINs:
http://www.nabble.com/convert-3D-polygons-or-Tins-to-a-DEM--td14998420.html

AFAIU, code to manage the creation (and editing?) of 3d features, like
TINs, is still undergoing development.
I think this is a good moment to propose to consider, in the TIN
creation phase, the use of multiple types of input features: points,
lines, polygons.
I come from ArcGIS world, where it's possible to set these as "mass
points", "breaklines" and "hulls" [1]. For example these features are
strongly requested by geologists, when i.e. fault lines has to be
setted, or when a highland is known to "break" the linear
interpolations of points.

Of course, it's a wish... but maybe useful while doing "brainstorming"
about the code to be developed. :-)

Giovanni

[1]: http://webhelp.esri.com/arcgisdesktop/9.2/index.cfm?TopicName=Creating_TIN_surface_data_from_vector_data