man collision (Fonctions bibliothèques) -
NAME
Collision detections between scene geometry -
Classes
class SoIntersectionDetectionAction
"TheSoIntersectionDetectionActionclassisfordetectingintersectingprimitivesinascene.
Note that only collisions between actual geometry in the scene is detected, so the contents of some special nodes like e.g. SoText2 and SoImage (which projects to screen-plane bitmap graphics, and not actual polygons) will not be considered for collision detection. "