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 |
| Material
Textures
Texture Transform |
|
Directional Light
Point Light Spot Light |
Hierarchical Node Structures
|
Group
Transform Collision Anchor Billboard Switch |
Defining and Instancing Nodes
Defining Levels of Detail
Events in VRML
|
Creating Paths between events:
ROUTE
Generating Events based on Timers or User Actions
|
|
Color
Coordinate Normal Orientation Position Scalar Example |
|
Sound
AudioClip |
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Who Am I: NavigationInfo
Where Am I: ViewPoint |
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Background
Fog |
| WorldInfo |
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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:
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.
