The cone and box are children of a Collison node with its collide field set to FALSE (you can pass throught them). The sphere's Collision node has its collide field set to TRUE.
Initial position.
The box and cone are decendents of a
Collision group node with the collide field set to FALSE
Moving towards sphere with the cone blocking the path
With the collide field set to FALSE, the avatar is able to move
through the cone.
VRML 2.0 world file
[ collisionEx2.wrl ]
Code for Collision Example 2
[ source ]
DEMO
using Liquid Reality
[collision_LR]