Grouping Node:

Billboard

Definition:

Billboard {
   eventIn       MFNode   addChildren
   eventIn	 MFNode   removeChildren
   exposedField  SFVec3f  axisOfRotation  0 1 0
   exposedField  MFNode   children	  []
   field         SFVec3f  bboxCenter	  0 0 0
   field         SFVec3f  bboxSize	  -1 -1 -1
}

Description:

The billboard node modifies its coordinate system so that the local z-axis of its children is always pointing towards the viewer.


Explanation:

axisOfRotation : specifies the axis the object will rotate on so that the local z-axis will point at the viewer
children : these objects will modify their coordinate system to always face the viewer
bboxCenter/
bboxSize
: specifies the bounding box that encloses the children