Class Name: Lobe Data

Superclass - SEDRIS Abstract Base

Definition

Describes a cone or a pyramid shape of a light source or directional light in terms of direction vectors for the central axis (light direction) the vertical axis, and horizontal and vertical angular widths.

Primary Page in DRM Diagram:

• 21

Secondary Pages in DRM Diagram:

• 3

Example

See examples in: Spot Light, Blend Directional Light, Cone Directional Light, and Pyramid Directional Light.

FAQs

If the two Reference Vector components specify the light direction and vertical axis, how is the horizontal axis specified?

The horizontal direction is always perpendicular to the plane of the two Reference Vectors of type SE_LIGHT_DIRECTION and SE_VERTICAL_AXIS.

Constraints

• Inheritance Rule For Location

Composed of (one-way)

• exactly (2) Reference Vectors (notes)

Component of (one-way)

• optionally, some Directional Light Behaviors
• optionally, some Spot Lights

Field Elements

Notes

Composed of Notes

Reference_Vector

 one component defines the lobe axis direction with
   Reference Vector type = SE_LIGHT_DIRECTION
 the other component defines the vertical axis direction with
   Reference Vector type = SE_VERTICAL_AXIS

Fields Notes

horizontal_width

   horizontal_width - defines the horizontal lobe width,
   (in degrees 0 - 360)
   perpendicular to the SE_VERTICAL_AXIS Reference Vector

vertical_width

   vertical_width - defines the vertical lobe width,
   (in degrees 0 - 360)
   parallel to the SE_VERTICAL_AXIS Reference Vector