> > why not to use the python bindings of VTK (http://www.vtk.org) to do 3D > rendering? It seems to me that VTK is a bit easier to handle than OpenGL > directly, but my programming skills are not the best. > WolfgangZ
Apart from the problem with limited coordinate ranges brought about by OpenGL, VTK uses a visualization pipeline rather than layers. There is nothing wrong with this per se, but GIS users are accustomed to layers that cover each other in a pre-defined order, even if there is no difference in the Z coordinates. VTK projects all objects into the same 3D space, potentially giving unexpected results, e.g. when overlaying vector outlines on a raster surface without raising the former a little bit towards the zenith. Might be worth thinking about this. I don't know how easy or complicated it would be to emulate a layer-based drawing on a VTK rendering pipeline. Benjamin _______________________________________________ grass-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-dev
