VRML Script Tutorial Full list VRML Interactive Tutorial Introduction VRML File Structure Drawing: Shape node Geometry Nodes: Box Sphere Cone Cylinder PointSet IndexedLineSet IndexedFaceSet Extrusion ElevationGrid Example: Chessboard Text FontStyle Appearance Material Textures Image Texture Movie Texture Pixel Texture Texture Coordinate Texture Transform Let there be Light Directional Light Point Light Spot Light Materials with Colored Lights Hierarchical Node Structures Group Transform Collision Anchor Billboard Switch Inlining Files Defining and Instancing Nodes Defining Levels of Detail Events in VRML Creating Paths between events: ROUTE Generating Events based on Timers or User Actions Timers Touch Sensor Visibility Sensor Dragging Sensors Plane Sensor Sphere Sensor Cylinder Sensor Proximity Sensors Example: Proximity sensor Interpolators Color Coordinate Normal Orientation Position Scalar Example Let the Music Play Sound AudioClip Bindable Nodes Who Am I: NavigationInfo Where Am I: ViewPoint Adding Realism to the world Background Fog Information about your world WorldInfo Definition for Auxiliary Nodes Coordinate Color Normal				ProximitySensor Example Many people have asked how to have a shape, or group of shapes, keeping its relative position to the user when the user is moving. This example shows you how to do that. ProximitySensor nodes can be used to keep track of the users position and orientation. Two eventOuts are provided for this effect: position_changed orientation_changed Therefore a ProximitySensor node generates events whenever the user changes its position or orientation. These events can then be routed to a Transform node where the shapes are placed. The only problem with this method is that a ProximitySensor requires the definition of the size of a virtual box. If the user is outside the virtual box then the ProximitySensor will NOT generate events. To avoid this problem one can always define the size of the ProximitySensor to be larger than the world itself. The following code should do the trick: Example: #VRML V2.0 utf8 Group { children [ DEF ps ProximitySensor { center 0 0 0 size 1000 1000 1000 } DEF tr Transform { children Transform { translation 0 0 -5 children Shape {geometry Sphere{}} } } ] } ROUTE ps.position_changed TO tr.set_translation ROUTE ps.orientation_changed TO tr.set_rotation Note that the sphere which is 'locked' to the user position is inside a Transform node which contains a translation. This translation defines the relative position to the user, in this case the center of the sphere will be 5 units away from the user. Press the button below to see the VRML. Note that there is also a box in the world. The box should remain in its position while you move, only the sphere will follow your movement.