OptionalcolorsRGB grid line colour, components in [0, 1]. Default [0, 0, 0].
OptionalopacityBlend factor; 1 = fully opaque, 0 = invisible. Default 0.4.
OptionalspacingPixels between adjacent grid lines. Defaults to ≈ size / 16,
which gives a roughly 16-cell grid across the texture.
OptionalwidthLine width in pixels. Default 1.
Options for the optional debug grid drawn over painted heat maps.