Added catch for thread model w.r.t new PrecipitationEffect not being sensitive to threading issues.
Added catch for thread model w.r.t new PrecipitationEffect not being
sensitive to threading issues.


git-svn-id: 23b6355f2bb369032457de4eb5f713ee134f73a8@5114 16af8721-9629-0410-8352-f15c8da7e697

joevandyk/osg,joevandyk/osg,joevandyk/osg,joevandyk/osg,joevandyk/osg