Hi Lee,
This might be due to the display option.Â
Use the Display Options dialog box to enable lighting effects. Lights On is enabled by default with the Automatic lighting method. The Automatic lighting method automatically selects the best lighting method for the current display in the graphics window. You may disable Lights On or select an alternate method from the Lighting drop-down list. Flat is the most basic method: there is no interpolation within the individual polygonal facets. Gouraud and Phong have smoother gradations of color because they interpolate on each facet.
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