Line_color

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.