Read an osg::HeightField from file.
Read an osg::HeightField from file. Return valid osg::HeightField on success, return NULL on failure. Use the useObjectCache flag to override the osgDB::Regisytr::getUseObjectCacheHint(). The osgDB::Registry is used to load the appropriate ReaderWriter plugin for the filename extension, and this plugin then handles the request to read the specified file.
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