OSG and OsgEarth support

[Orsucciu]

Hello,

I would like to build my omnetpp with the support for 3D, since osg and osgearth examples are the types of simulations i need to run.

However, i can't find a way to build it with these two.

I have a windows machine, so no opp-env on it.
A ubuntu 24 machine, but there is no way to have osgearth 2.7 (or <3) on it
A ubuntu 20 machine, but now the ./configure command won't find my packages

I ran:
sudo apt install osgearth openscenegraph-plugin-osgearth libopenscenegraph-dev openscenegraph

And my configure.user, i tried default and specifying the lib paths:

# OpenSceneGraph libraries we want to use. Leave empty for autodetection
# or specify some invalid value (like "no" to explicitly disable OpenSceneGraph)
# At least the following libraries must be found: osg osgGA osgViewer osgQt OpenThreads
#
OSG_LIBS="-I/usr/include -L/usr/lib/x86_64-linux-gnu -losg -losgDB -losgGA -losgViewer -losgQt -lOpenThreads"

# osgEarth libraries to be used. Leave empty for autodetection.
# At least the following libraries are required: osgEarth osgEarthUtil
#
OSGEARTH_LIBS="-I/usr/include/osgEarth -L/usr/lib/x86_64-linux-gnu -losgEarth -losgEarthUtil -lgeos_c"

but to no avail...

checking for OpenSceneGraph with CFLAGS=" -fPIC  -Wno-deprecated-register -Wno-unused-function -fno-omit-frame-pointer  " LIBS=" -fuse-ld=lld -Wl,-rpath,$(OMNETPP_LIB_DIR) -Wl,-rpath,. -Wl,-rpath,$(OMNETPP_TOOLS_DIR)/lib  -Wl,--export-dynamic  -losg -losgDB -losgGA -losgViewer -losgUtil -lOpenThreads"... no
configure: error: Cannot find OpenSceneGraph 3.2 or later - 3D view in Qtenv will not be available. Set WITH_OSG=no in configure.user to disable this feature or install the development package for OpenSceneGraph.

Thanks

[Orsucciu]

FINALLY

Okay, so i think it's complicated for the tool to install it by itself, but basically if you have the same problem, you need to set this:

# OpenSceneGraph libraries we want to use. Leave empty for autodetection
# or specify some invalid value (like "no" to explicitly disable OpenSceneGraph)
# At least the following libraries must be found: osg osgGA osgViewer osgQt OpenThreads
#
OSG_LIBS="-I/usr/include -losg -losgDB -losgFX -losgGA -losgParticle -losgSim -losgText -losgUtil -losgTerrain -losgManipulator -losgViewer -losgWidget -losgShadow -losgAnimation -losgVolume -L/usr/local/lib -lOpenThreads"

# osgEarth libraries to be used. Leave empty for autodetection.
# At least the following libraries are required: osgEarth osgEarthUtil
#
OSGEARTH_LIBS="-I/usr/include -L/usr/lib -losgEarth -losgEarthUtil -losgEarthAnnotation -losgEarthSplat -lgeos_c"

Inside your omnet/configure.user file
Then you can make cleanall && ./configure to check if it works

EDIT
Ah no :( At build it still fails, even tho make says it's working fine

EDIT2:
If you absolutely need to make osg and osgearth work, it easier to just download the packages separately, and compile them one by one. Omnet 6.0.3, Flora 1.1, Init 4.4 work together fine. But normally you'll get stuck like me with errors because the apt versions of openscenegraph and osgearth aren't compiled with the correct dependencies. So you need to re-build them yourself. Ubuntu 20, or maybe 22 are going to be easier.

[rhornig]

Sadly, supporting osg and osgEarth is not trivial in an opp_env envionment. The reason is that and the low level the openGL driver must be hardware specific which depends on the actual hardware you are running on. There are various ways to work around this with wrapper scripts, but it was way too complicated to set up and requires manual setup.

running on nixOS would be easier, but very few users are actually using nixOS navtively. Also the opp_env WSL base image could be based on nixOS in the future, but right now that image is also based on Ubuntu.

The easisest (but not fastest) solution would be to use the Windows MSYS (mingw) based installation of OMNeT++ which comes the required dependencies pre-packaged (i.e. it includes osgEarth 2.7).