/* Obstacles stores a 2D boolean array (obs) representing the XZ plane.  The row index is the z-axis, the column index is the x-axis.  obs[0][0] is the back left hand corner of the plane, which is the (x,z) point (0-FLOOR_LEN/2, 0-FLOOR_LEN/2). 

Obstacles can only be positioned at integer positions due to the use of array subscripts to mark the obstacle positions.*/

privatebooleanobs[][]; // whether a (x,z) has an obstacle//private BoundingSphere obsBounds[][]; // the bounding sphere for obsprivateBoundingBoxobsBounds[][]; // the bounding sphere for obsprivateGroupobsGroup; // group of 3d obstacles shown in world

Dear Andrew Davison: I am sorry i didn't describe the question detailly; Thanks for your detail reply.  I want to know is there are any differents between BoundingBox and BoundingSphere in Java 3D api. Now I want to build obstacles whitch is box like (1.0,10.0,2.0),but the BoundingSphere is a sphere.  In tour3D, you build the bounds with BoundingSphere.and now i want to build the Bounds with BoundingBox.  I know both BoundingSphere and BoundingBox have intersect() method. But this method doesn't take effect after i use BoundingBox instead of BoundingSphere.the TourSprite can go througt of the obstacles.  I am the biginner of Java 3D programming. 

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