On 14 December 2017 at 20:41, Martin Dobias <wonder...@gmail.com> wrote: > Hi Andreas > > On Wed, Dec 13, 2017 at 3:31 PM, Andreas Neumann <a.neum...@carto.net> wrote: >> Hi, >> >> Being a caver, I have a lot of underground data. Thanks to the support from >> Martin I got them to load correctly as 3D polygondata. >> >> However, one issue I have is that the terrain rendering disappears when I >> look below the terrain model surface - which isn't so nice for a caver or >> geologist. Is this also an issue about culling? Would it be possible to >> enable the rendering of the backside of the terrain surface? > > The fact that terrain from below is not rendered is a very common > optimization in 3D rendering called back-face culling - it makes > rendering faster by only rendering triangles that are facing camera. > It is not difficult to turn it off, but I am not sure if the culling > should be turned off by default...
Could we give the terrain some small "thickness", and add a duplicate, slightly lower surface facing downwards below the existing DEM? Nyall _______________________________________________ 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
