Constructor and destructor.
Returns the index of the relevant string within a multiple-value string field of a text node.
Returns the index of the relevant character within the string. For example, if the character of detail was the "u" within "Splurmph", the character index would be 3.
For SoText3, this returns which part was picked or generated.
When the detail is returned from picking, these return the object-space bounding box of the character that was intersected. Otherwise, they return an empty box. The second method returns an SbXfBox3f instead of
a SbBox3f. These methods are implemented only for 3D text.
Returns type identifier for this class.