VRML Script Tutorial
VRML Interactive Tutorial
Let there be Light
Materials with Colored Lights
VRML File Structure
Drawing: Shape node
Hierarchical Node Structures
Defining and Instancing Nodes
Defining Levels of Detail
Events in VRML
Let the Music Play
Adding Realism to the world
Information about your world
Definition for Auxiliary Nodes
Billboard is a special grouping node. All children nodes will turn to face
you, as a sunflower to turns to face the sun as it moves. The children
nodes will rotate in a user defined axis.
The following fields are present:
children which contains all the nodes included in the group.
axisOfRotation specifies a 3D vector which will be used for the rotation.
If a null vector is specified, (0,0,0), then the object rotates to always
face the user.
bboxCenter specifies the center of a box that encloses the nodes
in the group. The value for this field is a 3D point.
bboxSize specifies where the size of a box that encloses the
nodes in the group. By default this field has a value of -1 -1 -1, which
implies that no box is defined. The values for this field must be greater
than or equal to zero. If the children nodes do not fit inside the box
defined the results are undefined.
The latter two fields are optional. They can be used by the browser for
children [ ]
axisOfRotation 0 1 0
bboxCenter 0 0 0
bboxSize -1 -1 -1
If an axisOfRotation different from the null vector is specified
then there is one case where results are undefined, this occurs when the
user is aligned with the axis of rotation.