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 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.

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.

Analyzing the performance of various hierarchical bounding volumes(HBVs),a fast algorithm for real-time collision detection(CD)was proposed using a structure of hybrid hierarchical bounding volume(HHBV)based on OBB and sphere BV.

Oriented bounding box (OBB) hierarchy is a popular and efficient approach for accelerating collision detection (CD) among complex rigid models, but it can’t determine the contact status among objects far away as fast as other bounding volumes (BVs), such as axis-aligned bounding boxes (AABB) or sphere BV, because each intersection test of OBBs is much more complex than that of others.