The Roll attribute rolls the brush around the X-axis. The effect of the roll is most noticeable when used with one of the non-symmetrical brushes. For each increment of 25 percent, the Roll attribute value creates a rolled brush stroke of 90 degrees.
Note: You can use any attribute mode with the Roll attribute.
 Roll attribute value at 100% |
 Roll attribute value at 75% |
 Roll attribute value at 50% |
 Roll attribute value at 25% |