Class

• <DRM Light Rendering Properties>

Superclass

• <DRM SEDRIS Abstract Base>

Subclass

• None.

Definition

An instance of this DRM class specifies that the aggregating <DRM Geometry Representation> is to be rendered so as to provide the illusion that the <DRM Geometry Representaiton> emits light, but unlike an actual <DRM Light Source> instance, the <DRM Geometry Representation> will not actually emit light (for example, shadows should not be generated).

The display_type field specifies whether the light is raster or calligraphic.

The light_diameter field specifies the size of the light, in pixels. The default value, 0,0, means “not applicable.”

The light_extinguishing_range field specifies the distance, in metres, at which the light is no longer seen. The default value, 0,0, means that it is always seen.

The random_area_light field specifies whether all lights at this level and in the associated component tree were originally part of a random area light.

The active_light_value field specifies the default / active state of the light, where TRUE = on, and FALSE = off.

The candela_value field specifies the candela value of the light at full intensity. The default value, 0,0, means that the source had no candela value.

Class diagram

Figure 6.149 — DRM_Light_Rendering_Properties

Constraints

• Homogeneous Light Rendering Properties
• Publishable Object

Example(s)

• Any <DRM Primitive Geometry> can take on light behaviour. An example might be a <DRM Point>, instance where the light point is visible to a certain extinguishing range (default = 0; that is, the light is visible from any distance).