This is part of the Findosg* suite used to find OpenSceneGraph components. Each component is separate and you must opt in to each module. You must also opt into OpenGL and OpenThreads (and Producer if needed) as these modules won't do it for you. This is to allow you control over your own system piece by piece in case you need to opt out of certain components or change the Find behavior for a particular module (perhaps because the default FindOpenGL module doesn't work with your system as an example). If you want to use a more convenient module that includes everything, use the FindOpenSceneGraph instead of the Findosg*.cmake modules.
Locate osgSim This module defines:
OSGSIM_FOUND Was osgSim found?
OSGSIM_INCLUDE_DIR Where to find the headers
OSGSIM_LIBRARIES The libraries to link for osgSim (use this)
OSGSIM_LIBRARY The osgSim library
OSGSIM_LIBRARY_DEBUG The osgSim debug library
$OSGDIR is an environment variable that would correspond to:
./configure --prefix=$OSGDIR
used in building osg.
Created by Eric Wing.
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Licensed under the BSD 3-clause License.
https://cmake.org/cmake/help/v3.31/module/FindosgSim.html