If you are not wanting the sun to affect your material colors then under your section settings switch the "Fill uncut surfaces with" to Own material Colors (non shaded). I hope that is what you are asking about.
Robert Fuchs
Miller Bosksus Lack Architects, P.A.
2x2.26GHz Quad-Core Intel Xeon w/10 GB RAM
Mac OSX 10.6.4, AC 14 (3004 USA Full)