here you are

FADE OBJECT
This command will make the specified 3D object fade to the current ambient light level. With ambient light
set to zero and the object faded using a value of zero, the object will be completely unlit. With a fade
value of 200 its illumination will be doubled. With a fade value of 50, the illumination is halved. This
technique can also be used with a ghosted object to slowly fade an object until completely invisible. The
parameter should be specified using an integer value.
SYNTAX
FADE OBJECT Object Number, Fade Value