Hi, [EMAIL PROTECTED] píše v Pá 19. 10. 2007 v 00:43 +0000: > I am trying to generate a model very much like the screenshot of Trento > on the Grass home page using data for the city of Seattle. I have > building outlines and heights in a vector map and accurate elevation > data in a raster file. I have used v.extrude to construct the > buildings. When I try to plot them in nviz, I get odd disjointed > floating surfaces rather than the solid looking 3D objects objects in > the Trento example.
note: NVIZ has problems with concave shapes, like +--+ +--+ | | | | | +--+ | +--------+ you can use paraview for 3D data displaying as well > The extruded vector coverage has only faces, no > lines, areas, or centroids. Is that normal? faces are to be understood as "3D areas", their centroids are "kernels". yes, v.extrude generates only faces > I tried extruding both > with and without the "trace" flag set. this only causes, that the "roofs" of building will "copy" the elevation. Otherwise, they remain flat. > > > What commands were used to create the beautiful model of Trento? Was it > something other than v.extrude and nviz? > Markus knows more .. but I would say, something like 1 - prepare map with areas (no lines) of building footprints 2 - each area has to have centroid 3 - update building height in the map attribute table 4 - run v.extrude like v.extrude in=building_areas out=builidngs3D elevation=your_dem hcolumn=height_column_in_attribute_table hope it helps Jachym -- Jachym Cepicky e-mail: [EMAIL PROTECTED] URL: http://les-ejk.cz GPG: http://www.les-ejk.cz/pgp/jachym_cepicky-gpg.pub
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