VRML_SPOTLIGHT Procedure

Creates a VRML spotlight.

Usage

VRML_SPOTLIGHT, position 

Input Parameters

position—A 3-element array specifying the positioning of the spotlight.

Keywords

Angle—Specifies the angle of the light cone in degrees. (Default: 45)

Color—A 3-element array of RGB values, in the range of 0 to 255. (Default: [255, 255, 255], the color white)

Direction—The orientation of the light cone. (Default: [0, 0, –1])

Intensity—Number normalized from 0 to 1, where 1 is full intensity. (Default:1)

Rate—The exponential drop-off rate for light intensity from the axis of the light cone. (Default: 0)

Discussion

VRML_SPOTLIGHT implements one of the three types of lighting supported by VRML. (VRML_LIGHT is another.) A spotlight emanates light inside of a cone shape.

Example

VRML_OPEN, 'vrml_spotlight.wrl'

...

VRML_SPOTLIGHT, [-1, -1, 0], Color = [255, 0, 0]

VRML_CLOSE

See Also

VRML_CAMERA, VRML_LIGHT, VRML_OPEN 

For a discussion of VRML lighting, see The VRML Sourcebook, by Andrea L. Ames, et al., John Wiley & Sons, Inc., 1996, Chapter 19.