Transformation nodes
The osg::Group nodes do nothing except for traversing down to their children. However, OSG also supports the osg::Transform family of classes, which is created during the traversal-concatenated transformations to be applied to geometry. The osg::Transform class is derived from osg::Group. It can't be instantiated directly. Instead, it provides a set of subclasses for implementing different transformation interfaces.
When traversing down the scene graph hierarchy, the osg::Transform node always adds its own transformation to the current transformation matrix, that is, the OpenGL model-view matrix. It is equivalent to concatenating OpenGL matrix commands such as glMultMatrix(), for instance:
This example scene graph can be translated ...
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