VRML 2.0 Sourcebook, Chapter 27 - Sensing Visibility Proximity Collision
![[1] Figure27.1VisibilitySensorDungeonSlidingDoors.x3d - Now doors open, because they are visible](_viewpoints/Figure27.1VisibilitySensorDungeonSlidingDoors.x3d._VP_Now doors open, because they are visible.png)
These X3D scenes are adapted directly from the original VRML 2.0 Sourcebook chapter examples. Also available: VRML 2.0 Sourcebook chapter course notes.
![[2] Figure27.1VisibilitySensorDungeonSlidingDoors.x3d - Now doors close, because they are not visible](_viewpoints/Figure27.1VisibilitySensorDungeonSlidingDoors.x3d._VP_Now doors close, because they are not visible.png){kind=link}
![[3] Figure27.1VisibilitySensorDungeonSlidingDoors.x3d - (default X3D view)](_viewpoints/Figure27.1VisibilitySensorDungeonSlidingDoors.x3d._VP_Default viewpoint.png){kind=link}
![[4] Figure27.2ProximitySensorDungeonSlidingDoors.x3d - Now you see doors closed, because they are far away](_viewpoints/Figure27.2ProximitySensorDungeonSlidingDoors.x3d._VP_Now you see doors closed, because they are far away.png){kind=link}
![[5] Figure27.2ProximitySensorDungeonSlidingDoors.x3d - Now you see doors opened, because you are close](_viewpoints/Figure27.2ProximitySensorDungeonSlidingDoors.x3d._VP_Now you see doors opened, because you are close.png){kind=link}
![[6] Figure27.2ProximitySensorDungeonSlidingDoors.x3d - (default X3D view)](_viewpoints/Figure27.2ProximitySensorDungeonSlidingDoors.x3d._VP_Default viewpoint.png){kind=link}
![[7] Figure27.3CollisionDetectionSpinningOrb.x3d - Zoom in on the orb to trigger the Collision node](_viewpoints/Figure27.3CollisionDetectionSpinningOrb.x3d._VP_Zoom in on the orb to trigger the Collision node.png){kind=link}
![[8] Figure27.3CollisionDetectionSpinningOrb.x3d - Close-up viewpoint by the orb that triggers the Collision node](_viewpoints/Figure27.3CollisionDetectionSpinningOrb.x3d._VP_Close-up viewpoint by the orb that triggers the Collision node.png){kind=link}
![[9] Figure27.3CollisionDetectionSpinningOrb.x3d - (default X3D view)](_viewpoints/Figure27.3CollisionDetectionSpinningOrb.x3d._VP_Default viewpoint.png){kind=link}