This engine computes the bounding box and center of a scene graph. The scene graph can be defined by a path or by a root node.
If the
path input is not NULL, the bounding box of the graph defined by the path
will be computed. If
path is NULL, but the
node input is not NULL, the bounding box is computed on the graph rooted by the node. By default, the two inputs are NULL. If both the inputs are NULL, the outputs
are disabled.
The engine uses a default viewport region. If the graph includes screen-based objects (such as
SoText2) you can call
setViewportRegion() on the engine instance to set up the correct viewport region to use.