Class Name: Lobe Data

Superclass - <SEDRIS Abstract Base>

Subclasses

Definition

An instance of this DRM class 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_REF_VEC_TYP_LIGHT_DIRECTION and SE_REF_VEC_TYP_VERTICAL_AXIS.

Constraints

• <<Required Reference Vector Location>>

Composed of (two-way)

• exactly 2 <Reference Vector> instances (notes)

Component of (two-way)

• zero or more <Directional Light Behaviour> instances
• zero or more <Spot Light> instances

Inherited Field Elements

Field Elements

Notes

Composed of Notes

Reference_Vector

 These are the lobe cross section axes.

 One component <Reference Vector> specifies the lobe axis
 direction with vector_type = SE_REF_VEC_TYP_LIGHT_DIRECTION.

 The other component <Reference Vector> specifies the vertical
 axis direction with vector_type = SE_REF_VEC_TYP_VERTICAL_AXIS.

Fields Notes

horizontal_width

 This defines the horizontal lobe width, measured in degrees,
 between 0 and 360 inclusive.

 This is measured perpendicular to the SE_REF_VEC_TYP_VERTICAL_AXIS
 <Reference Vector> component.

vertical_width

 This defines the vertical lobe width, measured in degrees,
 between 0 and 360 inclusive.

 This is measured parallel to the SE_REF_VEC_TYP_VERTICAL_AXIS
 <Reference Vector> component.