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VRML Script Tutorial
Full list
VRML Interactive Tutorial
Introduction
VRML File Structure
Drawing: Shape node
Geometry Nodes:
Appearance
Let there be Light
Materials with Colored Lights
Hierarchical Node Structures
Inlining Files
Defining and Instancing Nodes
Defining Levels of Detail
Events in VRML
Interpolators
Let the Music Play
Bindable Nodes
Adding Realism to the world
Information about your world
Definition for Auxiliary Nodes
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IndexedLineSet Node
The IndexedLineSet node specifies a set of polylines in the local coordinate
system and associated colors.
This node contains five fields: coord, coordIndex, color,
colorIndex and colorPerVertex.
The coord field specifies a Coordinate
node. In this node a set of 3D coordinates are given.
The coordIndex field specifies a list of coordinate indexes defining
the polylines to be drawn. To separate the indexes from one polyline a
space is used, to separate the sets of indexes from two adjacent polylines
the marker -1 is used, i.e. an index of -1 indicates that the current polyline
has ended and the next one begins.
The color field defines a Color
node. This node defines a list of colors to apply to the polylines. The
color is optional, the default values being applied if the field
is not specified. If a Material
node is specified the default color is the emissive color from this node.
Note that both the default emissive color and background are black, so
if no color is specified and the default background is used you won't be
able to see the lines.
The colorIndex serves the same purpose has the coordIndex
but regarding colors.
The colorPerVertex is a boolean field which defines how the colors
are applied.
colorPerVertex is TRUE: colors apply to each vertex. The final
result is that each line starts in one color and ends with another color,
producing a gradient effect. On some browsers the color for each line will
be the average color for the two ends of the line. There must be as many
indices in colorIndex as in coordIndex with the end-of-polyline
markers,-1, in exactly the same place. If the colorIndex is absent
then the coordIndex is used to select the colors and there must
be as many colors as indices in coordIndex.
colorPerVertex is FALSE: colors apply to each polyline. There
must be at least as many indices in the colorIndex as there are
polylines. If the coordIndex field is absent then the colors are
applied in the order presented in the color field.
Before presenting the syntax let's see some examples. In all the examples
presented, the coord field has the following coordinates: 0 0 0 1 1 0 -1
0 0 -1 -1 0 Playing with coordIndex
Playing with colors: The colors specified are Red, Green and Blue
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colorPerVertex TRUE
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colorPerVertex FALSE
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colorIndex [0 1 2 0 ]
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colorIndex [0 1]
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coordIndex [3 0 2 1]
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coordIndex [0 1 -1 2 3]
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Note: On the example which had colorPerVertex set to TRUE the colors
presented for each line are the average color from the two colors defined
for the end of each line.
Syntax:
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| IndexedLineSet { |
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coord NULL
coordIndex [ ]
color NULL
colorIndex [ ]
colorPerVertex TRUE
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| } |
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