[QGIS-Developer] FW: 3D Polygons in PYQGIS

[Nyall Dawson]

On Tue, 4 Jun 2024 at 23:43, Jean Garcia via QGIS-Developer
<qgis-developer at lists.osgeo.org> wrote:
>
> Good Morning!
>
> I had submitted a question about the usage of 3D functions through PYQGIS (Conversation forwarded below*).
> I attempted the usage of the recommended drape function through PYQGIS and have not had much success.
>         (Mainly, how would I create the raster layer from a constant slope?)
> I assume many of my issues has come from me not knowing much about PYQGIS as I am relatively new to the environment.
> This being the case how would I create a 3D layer in which the z values are determined by a constant slope?
>         (How would I even determine the start/end of said slope?)

It's still not clear what you're trying to achieve. This is probably
more appropriate for a gis.stackexchange post, along with sketches
illustrating what you're after.

Nyall


>
> Any feedback on my current progress is greatly appreciated!
>
> Many Thanks,
> Jean Garcia
>
> -----Original Message-----
> From: QGIS-Developer <qgis-developer-bounces at lists.osgeo.org> On Behalf Of Jean Garcia via QGIS-Developer
> Sent: Wednesday, May 29, 2024 9:49 AM
> To: Nyall Dawson <nyall.dawson at gmail.com>
> Cc: qgis-developer at lists.osgeo.org
> Subject: Re: [QGIS-Developer] 3D Polygons in PYQGIS
>
> Sorry for the confusion my request might have created.
> I am quite new to QGIS and have had to do a lot of online research with not much success. (mostly vaguely searching through QGIS Documentation)
>
> The project I am working on is to generate a layer based on given parameters, one of said parameters being the slope of each layer's Z Values.
>         (one said layer being stated as a slope of 20 to 1 for a horizontal distance of 4,000 ft) With said slope I wish to make the 2D layers I have already generated appear in a 3D view.
>
> I did some research into the drape tool, and while I do believe it could work my issue is how would I create the raster layer with the Z values?
> Since the Z values would depend entirely on the different parameters, it would not be set Z values.
>         (What even is the function to create the raster layer?)
>
> My current thinking is to calculate the Z values based on the slope and starting height of each layer.
> How do you think I should go around doing so?
>
> Thanks,
> Jean A. Garcia
>
> -----Original Message-----
> From: Nyall Dawson <nyall.dawson at gmail.com>
> Sent: Sunday, May 26, 2024 6:22 PM
> To: Jean Garcia <jean.garcia at vcomm-eng.com>
> Cc: qgis-developer at lists.osgeo.org
> Subject: Re: [QGIS-Developer] 3D Polygons in PYQGIS
>
> On Fri, 24 May 2024 at 06:09, Jean Garcia via QGIS-Developer <qgis-developer at lists.osgeo.org> wrote:
> >
> > Good Afternoon,
> >
> >
> >
> > I am currently working on a project that generates a 3D image of a layer. Is it still not possible to generate a 3D polygon through PYQGIS?
>
> What exactly are you trying to do? There's many ways this request could be interpreted.
>
> (Maybe the "drape" tool from the processing toolbox does what you need?)
>
> Nyall
>
> >
> > I have all the slope values, etc. I have also already made the polygon layers which I want to convert to 3D.
> >
> > Been looking around and haven't found any solutions that have been able to help me so this is my last resort before I give up.
> >
> > FYI. I am on version 3.28. This being the case if it is allowed in newer versions I would still wish to know.
> >
> >
> >
> > Many Thanks.
> >
> >
> >
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