In order to slove collision detection problem in virtual surgery,a fast collision detection algorithm based on oriented bounding box(OBB) was presented,which simplifies geometric representation to facilitate the process of collision detection between complex geometric objects.

Based on the hierarchical oriented bounding box (OBB) which is used in virtual reality to detect spatial collisions between 3D objects, a new interference detection method is developed in this dissertation.

Accurate and rapid collision detection of the parts of JQ900 Overhead Launching Gantry with Lower Launching Nose was realized using improved OBB technology,and finally realistic simulation results of the system based on VC++ and Open Inventor API platform were obtained.

This paper presented an improved algorithm for collision detection based on hierarchical bounding box, especially the algorithm based on oriented bounding box (OBB).

This paper introduces two collision detection algorithms,one is the famous method based on the oriented bounding box,the other is our method based on the fixed direction hull.

Based on the correlative factors to affect, set forth collision detection problem about alterable length of time slice, and then brought forward bounding volume method and distance tracking algorithm, which can improve the speed of collision detection and can resolve collision detection problem in virtual reality well.