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 <[email protected]> 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 <[email protected]> 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 <[email protected]> >> 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 >> > [email protected] >> > List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer >> > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer > > _______________________________________________ QGIS-Developer mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
