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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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DirectionalLight Node
If you're new to lighting in VRML, there is a Lighting
section in this tutorial which discusses general features of lighting in
VRML. In here only the aspects which are particular to Directional Lights
are discussed.
Directional Lights define a light source which is placed very far away
from your world (don't worry you don't have to specify a location for the
light). The light rays when they reach the world are parallel to a given
direction). This field specifies a vector in 3D to which the light
rays are parallel. The following figure attempts to define graphically
a Directional Light.
This light should only affect the nodes which are defined within the same
group, i.e. objects placed outside
the group where the Directional Light is defined are not lit. I say should
and not must because not all browsers support this feature.
The following fields are present in this node:
on specifies if the light is active. This is a boolean field.
intensity has values between 0.0 and 1.0. Higher values specify
stronger lights.
ambientIntensity specifies how much this light contributes to
the overall lighting .Values must be between 0.0 and 1.0
color is a RGB field to specify the color of the light..
direction which specifies a vector in 3D. The light rays are
parallel to this vector.
Syntax:
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DirectionalLight { |
on TRUE
intensity 1
ambientIntensity 0
color 1 1 1
direction 0 0 -1
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} |
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Note: On the VRML world presented as example the sphere
is placed at -2.5 0 0, the cone
is placed at the origin, and the cylinder
is placed at 2.5 0 0. If you're not familiar with placing shapes other
than at the origin see the Transform
node.
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