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- From: Len Bullard <cbullard@hiwaay.net>
- To: srn@techno.com, x3d-contributors@web3d.org
- Date: Sat, 12 Feb 2000 21:41:49 -0600
Steven R. Newcomb wrote:
>
> In the grove paradigm, *you* get to decide what's important when you
> create the property set.
For anyone, not just Steven. Here is a very condensed expression of
basic VRML.
How is it expressed as a grove?
By VRML97 specification, VRML is a node language where nodes have
fields. VRML is rootless. A sceneGraph is a collection of VRML
nodes. NOTE: sceneGraph is not a named property
Declaration example (UTF8 VRML97)
node: Collision {
field: children [ ] # exposedField (Fieldtype) MFNode
(FieldValue)
field: proxy NULL # field SFNode
field: addChildren # eventIn MFNode
field: removeChildren # eventIn MFNode
field: collideTime # eventOut SFTime
}
VRML has:
Comments - flag is #
Named Type Nodes
Name Type Fields
Hierarchy property is a field value type: SF or MFNode
Inline property is by node type (Inline).
Symbols:
#VRML V2.0 utf8 - header must begin file
# comment
ROUTE: denotes field routing relationship:
from/to by type
DEF node label
USE instance copy reference by node label
IS connection of interface item to node body item
SF single field
MF multifield
{ } , [ ], whitespace
NULL, TO, eventIn, eventOut,
exposedField, field
VRML Node Types (group names used in list are
not a property of VRML; myNames are used here)
Aggregrate: Protos (Node type extensibility)
Sets - Group, Switch, LOD, Transform, Shape, Billboard, Inline
Sound, Collision
Document - WorldInfo
Style: Appearance, Material, FontStyle, Color, ImageTexture,
PixelTexture, MovieTexture, Coordinate, TextureCoorinate. Normal,
Viewpoint, NavigationInfo
Lights - PointLight, DirectionalLight, SpotLight
Geometry nodes: Box, Cone, Cylinder, Sphere, Text,
PointSet, IndexedLineSet, IndexedFaceSet, ElevationGrid,
Extrusion, Billboard
Effects: Background, Fog, Billboard, AudioClip
Interfaces: TimeSensor, TouchSensor, PlaneSensor,
SphereSensor, CylinderSensor, VisibilitySensor,
ProximitySensor, Anchor, Script, ExternProto
Animation: ColorInterpolator, ScalarInterpolator,
PositionInterpolator, OrientationInterpolator,
CoordinateInterpolator, NormalInterpolator
FieldValue Types - SFNode, MFNode, SFBool,
SFColor, MFColor, SFFloat, MFFloat, SFImage,
SFInt32, MFInt32, SFRotation, MFRotation,
SFString, MFString, SFTime, SFVec3f, MFVec3f,
SFVec2f, MFVec2f
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