Hi, I've finally solved the elevation issue on mac. Here are some details if anyone is interested. The heighfields didn't load when using a TMS driver, with GDAL driver it worked fine (for example multiple_heightfields.earth). The problem seemed to be in processing tiff images. By default, osg can be compiled with two libraries for reading images quicktime - printed an error message "Quicktime Reader/Writer could not read image..." imageio - printed nothing, but no elevation was loaded It is also possible to install libtiff on mac as a package in the "unstable" tree of fink (http://www.finkproject.org/). After some changes to CMake files, /osgDB/Registry and osgEarth itself (the osgdb_tiff plugin needs to be preloaded) everything would run, but still printed error messages (at least more detailed ones) I tried experimenting with the format of the tiff files, but without success. For this I've set up a simple proxy, so at least i measured the speed of the tile provider - it takes 300 - 500 ms to download a 2kB elevation tile. I ended up modifying the way 16bit tiff images are handled by imageio plugin (osgPlugins/imageio/ReaderWriterImageIO.cpp) The mac is not in the best condition - it runs fine in Safe boot, which is useful for compiling, but OpenGL doesn't work. When booting normally it either doesn't start at all or freezes after some time (sometimes a few minutes, sometimes a few hours). I also have an OS X virtual machine running on vmware, but that doesn't support OpenGL either. Anyway, everything is working now on mac (tested on Snow Leopard and Lion) Binaries are in the ftp storage (tags/updraft_tag_january_osx32release.zip) Bohdan
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