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       dynload_overview - Dynamic Loading of Extension Nodes When Coin tries
       to get hold of a node type object (SoType) for a class based on the
       name string of the node type, it will - if no such node type has been
       initialized yet - scan the file system for a dynamically loadable
       extension node with that given name. This can be completely disabled by
       setting the environment variable COIN_NO_SOTYPE_DYNLOAD to a positive
       integer value, new from Coin v2.5.0.

       On UNIX, extensions nodes are regular .so files. On Win32, extension
       nodes are built as DLLs. On Mac OS X systems, extension nodes are built
       as .dylib files. (Note: The extension nodes have to be built using the
       flag ’-dynamiclib’, not ’-bundle’.)

       Whether the dynamically loadable objects should be named with or
       without the ’lib’ prefix is optional. Both schemes will work.

       People don’t usually program in a way so that they instantiate new
       nodes through the node class’ SoType object, but that is the way nodes
       are created when model files are loaded. This means that for all Coin
       applications that load model files, the custom extension nodes will
       automatically be supported for the model files without you having to
       modify their source code and rebuild the applications.

       See for an
       example using two dynamically loadable extension nodes. You only use an
       examiner viewer to view the two extension nodes in action.

       Only a limited set of C++ compilers are supported as of yet. This is
       because, to initialize the extension node, it is necessary to know
       something about how the C++ compiler mangles the initClass symbol. If
       we don’t know that, there is no way to locate the initClass method in
       the library, which means the extension node can not make itself known
       to the type system.

       If your C++ compiler is not supported, the source file to add support
       for a new compiler in is src/misc/cppmangle.icc. It is fairly trivial
       to add support for new compilers, but if you don’t understand how, just
       ask us about it. Patches with support for new compilers are of course
       very welcome.

       See also:

           Coin 2.0