By "infinitesimally small" you mean not visable?
4.5 has a bug when mapping light fog. Trying deleting your lightfog node, and reapplying the light fog.
Also, you should use a decay with a lightfog light, else you'll get a very harsh edge where the fog stops, and it doesn't look pretty.
Try using linear decay, and upping the light intensity.
Last edited by Blinn : 25-06-2003 at 05:53 AM.