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The Bulge texture map is similar to the Grid texture. However, it adds 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. 

UI Path: ||mat Network|| > V-Ray > Texture: Procedural > V-Ray Bulge

U Width – Set 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.