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The Bulge texture map is similar to the Grid texture but adds in the feature of acting as if the grid lines are constraining the texture and the texture is inflated from beneath it. It is most often used as a bump map, but can also be used to simulate transparency as well. When used as a bump map it gives an inflated look.

U Width – Sets the thickness of the horizontal lines.

V Width – Sets the thickness of the vertical lines. For more information, see the U Width and V Width example below.

Color Manipulation

Invert Texture –  Inverts the RGB texture values. 

Alptha from Intensity – Uses the texture RGB intensity/luminance as alpha channel. 

Color Gain –  Color corrects the texture by multiplying the RGB color values in the texture with the RGB color values specified here. A texture map can be used for this parameter, as long as the checkbox is enabled. 

Color Offset – Color corrects the texture by adding the RGB color values specified here t the RGB color values in the texture. A texture map can be used for this parameter, as long as the checkbox is enabled.  

Default Color – Specifies a default color used for polygons with no valid UVs. In case the map is not tiled, specifies a default color that is used outside the texture square.  When a texture is selected, it overrides the color as long as the texture checkbox is enabled.