... The texture was formed in part by the bump map shown below. ... This is an example of how to render a realistic looking fabric, at fairly high detail. ... Bump maps are applied to a unit square. ... In my example I scaled this down to 0.17 (arbitrarily picked), which ammounts to 1/0.17 = 5.88 bump maps per unit, or 11.76 threads per unit. ... To match this to the bump map, it has to be scaled in half, so that we have two-by-two checker squares in each unit square, just like the bump map. ...