Fixed Coverity reported issue.
Fixed Coverity reported issue.

CID 11815: Uninitialized scalar field (UNINIT_CTOR)
Non-static class member _cosMaxElevation is not initialized in this constructor nor in any functions that it calls.
Non-static class member _cosMaxFadeElevation is not initialized in this constructor nor in any functions that it calls.
Non-static class member _cosMinElevation is not initialized in this constructor nor in any functions that it calls.
Non-static class member _cosMinFadeElevation is not initialized in this constructor nor in any functions that it calls.



ghub/osg,koshman86/osg,XiaoCC/osg,artoolkit/osg,XiaoCC/osg,artoolkit/osg,omega-hub/osg,artoolkit/osg,stmh/osg,ntoand/osg,ghub/osg,ghub/osg,artoolkit/osg,koshman86/osg,omega-hub/osg,omega-hub/osg,ntoand/osg,ntoand/osg,stmh/osg,stmh/osg,stmh/osg,ghub/osg,omega-hub/osg,XiaoCC/osg,koshman86/osg,XiaoCC/osg,stmh/osg,XiaoCC/osg,ntoand/osg,koshman86/osg