The color of the grid lines. The default color is white.
Filler_color
The color of the spaces between the grid lines. The default color is black.
Uwidth, Vwidth
The width of the grid lines in the U and V parametric directions. The valid range is 0 to 1. The slider range is 0 to 0.5.
The default value is 0.1.
Contrast
The contrast between the Line Color and the Filler Color. The valid/slider range is 0 (the two colors are averaged over the entire texture) to 1. The default value is 1.