Martin, Thanks. That is the issue. I'm sure the 3D support is going to continuously evolve and get better and hopefully sometime in the near future it will handle no-data values. In the meantime I will use your suggestion of remapping the no-data values.
Happy holidays, Calvin On Sat, Dec 16, 2017 at 12:03 PM, Martin Dobias <wonder...@gmail.com> wrote: > Hi Calvin > > I have tested with your layer and the problem is with the no-data > values - right now the terrain generator does not have a concept of > no-data values so they are interpreted as valid values, which in this > case is a very high number (around 1e38) and that breaks the 3D view. > Best to keep an eye on https://issues.qgis.org/issues/17558 as that is > essentially the same problem. As a temporary workaround, you could try > to change your layer's no-data values closer to the valid range (e.g. > zero or 500). > > Cheers > Martin > > > On Fri, Dec 15, 2017 at 10:51 PM, C Hamilton <adenacult...@gmail.com> > wrote: > > The current DEM that I am working with is located here: > > > > http://gis3.oit.ohio.gov/ZIPARCHIVES/ELEVATION/ > GRIDMOSAICS/GRE_DEM_MOS.zip > > > > I'm surprised that resizing did not help so I am not sure what is wrong. > I > > created a small 560x460 image that I have attached. It does not work for > me. > > > > Thanks, > > Calvin > > > > On Fri, Dec 15, 2017 at 4:22 PM, Martin Dobias <wonder...@gmail.com> > wrote: > >> > >> Hi Calvin > >> > >> Could you please point me to such a DEM to try it out myself? Or even > >> better, file a ticket on issues.qgis.org so that we do not forget > >> about it. Not sure from the top of my head what could go wrong there - > >> the raster size should not be the reason really as the raster data > >> access is using the same code paths as 2D rendering would. Maybe there > >> is something in the data that causes the problem. If you resize the > >> large DEM to e.g. 5000x5000 pixels, does that help? > >> > >> Regards > >> Martin > >> > >> > >> On Fri, Dec 15, 2017 at 8:38 PM, C Hamilton <adenacult...@gmail.com> > >> wrote: > >> > QGIS 3D has a lot of potential and works well with small DEM data > sets, > >> > but > >> > when ever I try it with a large DTM image I just get a white screen. I > >> > tend > >> > to work with large DEMs (50000 x 50000 pixels and larger) and I would > >> > love > >> > for this to work with it properly. > >> > > >> > Do you have any ideas why this is the case? I have tried this with an > >> > AIG/Arc/Info Binary Grid image as well as a GeoTIFF with overviews. > >> > > >> > OS: Windows 7; QGIS 3 Version: 2.99.0-238 > >> > > >> > Thanks, > >> > > >> > Calvin > >> > > >> > _______________________________________________ > >> > QGIS-Developer mailing list > >> > QGIS-Developer@lists.osgeo.org > >> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer > >> > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer > > > > >
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