some changes in 3d rendering properties... opacity, point size
some changes in 3d rendering properties... opacity, point size

git-svn-id: 5c3bb4a0fea81dff653294223dbc7ab7b926c710@1073 f169173b-cf89-36c8-b27e-44dbe73f0c83

markusgrotz/rtabmap,chen0510566/rtabmap,srmanikandasriram/rtabmap,chen0510566/rtabmap,srmanikandasriram/rtabmap,markusgrotz/rtabmap,MASKOR/rtabmap,MASKOR/rtabmap,srmanikandasriram/rtabmap,MASKOR/rtabmap,markusgrotz/rtabmap,chen0510566/rtabmap