VRML_SPOTLIGHT Procedure

VRML_SPOTLIGHT, position

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

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

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 A 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)

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.

VRML_OPEN, 'vrml_spotlight.wrl'
...
VRML_SPOTLIGHT, [-1, -1, 0], $
    Color = [255, 0, 0], $
VRML_CLOSE

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.