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... > The other issue I have is that tilting is somehow locked at the horizon. I > can look down on the terrain and then rotate the whole model until I look > sideway into the model, but than the rotation is blocked. I cannot rotate > any further so that my camera gets below the surface and that I could move > below the surface and look up towards the terrain. I guess this makes a lot > of sense for people who do not need to explore things below the terrain > surface, but for geologists or cavers, it would be great if this > rotation/tilting blocking could be disabled somehow. Yes this is intentionally locked (for now) as most users would probably complain if the camera went below the horizon. I understand you use case though - maybe we can have a underground/caver/geologist mode for the 3D view that would both disable back-side culling of terrain and also unlock camera rotation... Cheers Martin _______________________________________________ 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
