3D Graphics Programming with QuickDraw 3D 1.5.4

Light Data

Labels

ASCII: LightData
Binary: lght ( = 0x6C676874 )

Data Format



 
Boolean             isOn

Float32             intensity

ColorRGB            color

isOn: A value of True indicates that the parent light is active (is on). A value of False indicates that the parent light is inactive (is off).
intensity: The intensity of the parent light at its source. The value in this field must be in the closed interval [0, 1]. 0 is the minimum value; 1 is the maximum value.
color: The RGB color of the parent light.

Data Size

Description

A light data object specifies the color and source intensity of a parent light, and whether that light is currently active or inactive. A light object that does not have a light data object as a child object should be given the default values indicated below.

A value of less than 1.0 in the intensity field of a light data object affects the color of the parent light.

Parent Hierarchy

Data.

Parent Objects

A light data object always has a parent object; the parent object is always a light object.

Child Objects

None.

Example



 
Container (

    AmbientLight ( )

    LightData (

        True                        # is on

        0.75                        # intensity

        0.7 0.3 0.4                 # color

    )

)

Default Setting



 
True            # is on

1.0             # intensity (full)

1 1 1           # color (white)