Compatible with the new and old versions of OSG #15

Merged

mathieu merged 2 commits intoopenscenegraph:masterfrom

airscrat:master

Apr 23, 2018

Commits on Apr 19, 2018

Compatible with the new and old versions of OSG
airscrat
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Compatible with the new and old versions of OSG. osg3.4&3.6 passed the test.
airscrat
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