[Qgis-user] FILE .dwg and .cad

[Andreas Neumann]

  Hi,

And how are multiple geometry types treated with DGN-loading in QGIS? 
Sorry, I don't have a dgn at hand to test.

It all comes down that QGIS can't digest more than one geometry type in 
one layer, and there is no way of splitting the content of a single 
source out to multiple QGIS layers in one go. Once that would be solved, 
we could properly handle a number of data sources that provide more than 
one geometry type from one source.

Andreas

On 9/6/10 4:52 PM, Duarte Carreira wrote:
> Andreas,
>
> But QGIS reads DGN files directly, I assume through OGR, and with all geometry types in a single layer. We can then filter each geometry type and save to shapefile. Can't QGIS work the same way with DWG theoretically? If/when OGR provides a dwg driver that is similar to the dgn driver, then I would assume this would work.
>
> Duarte
>
> -----Mensagem original-----
> De: Andreas Neumann [mailto:a.neumann at carto.net]
> Enviada: sábado, 4 de Setembro de 2010 22:36
> Para: herman palaquium
> Cc: qgis-user at lists.osgeo.org
> Assunto: Re: [Qgis-user] FILE .dwg and .cad
>
> Hi,
>
> Currently, the dxf2shp plugin is more or less the only way to import dxf
> data to QGIS, by converting the dxf to multiple shapefiles.
>
> OGR (GDAL) recently included improvements for reading and writing in QGIS,
> but because QGIS cannot read several geometry types from one single file,
> it cannot be loaded directly from OGR without additional work in QGIS.
>
> DWG is again a different beast. There is the opendwg library (that needs
> to be licensed), and there are the attempts of other OS projects. However,
> DWG is a complex format, and it changes with every new Autocad releases.
> Not fun to write a reader/converter for.
>
> It is therefore unlikely that QGIS will soon have DWG support. You should
> ask the supplier of the file to deliver it in dxf or other more readable
> formats.
>
> Andreas
>
> On Fri, September 3, 2010 5:10 pm, herman palaquium wrote:
>> hi all
>>
>> how to import to the data view from file extension dwg and extension cad
>>
>> i cannot open that from add vector command or add raster command icon
>>
>> lovely QGIS "thetys"
>>
>> HERMAN
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>
> --
> Andreas Neumann
> http://www.carto.net/neumann/
> http://www.svgopen.org/
>
>