Class Name: Light Rendering Properties

Superclass - SEDRIS Abstract Base

Definition

A Light Rendering Properties object is used to give light rendering properties to all Geometry it is connected to. If a Light Rendering Properties object is a component of a Geometry object, then all Primitive Geometry below that Geometry object will have light characteristics. Most Primitive Geometry in this class have defaults, such as light_diameter and light_extinguishing_range.

Light behavior can take on 2 types: raster and calligraphic.

Primary Page in DRM Diagram:

• 3

Secondary Pages in DRM Diagram:

• 5
• 19

Example

1. Any Primitive Geometry can take on light behavior. An example might be a Point Geometry, where the light point is visible to a certain extinguishing range (default = 0, i.e. the light is visible from any distance).

FAQs

Constraints

• Homogeneous Light Rendering Properties

Composed of (one-way)

• optionally, some Light Rendering Behaviors

Composed of (two-way)

• optionally, a Light Rendering Properties Control Link

Component of (one-way)

• optionally, some Aggregate Geometries
• optionally, some Attribute Sets
• optionally, some Geometry Model Instances
• optionally, some Primitive Geometries

Field Elements

Notes

Fields Notes

light_type

 see enumeration below

light_diameter

 This value is the size in pixels. The default value is 0, which
 means "not applicable."

light_extinguishing_range

 This range is the distance (in meters) at which the light is no longer
 seen. The default is 0, which means it is always seen.

random_area_light

 This flag indicates (if TRUE) that all lights at this level or below
 were originally part of a random area light.

active_light_value

 SE_TRUE = on, SE_FALSE = off
 This is the default/active state of the light.

candela_value

 The candela value of the light at full intensity. The default value
 is 0, which means that the source had no candela value.