9.5.2

908 • CHAPTER 18
THE SHADERS • 909
This shader generates brick patterns. The Brick shader has an alpha channel that you can use on the
Material editor’s Alpha page. Color 1 determines the color of the brick. Color 2 determines the color
of the joints. Joint is the width of the joint relative to the size of the brick. Ramp denes the width of
the sloping edge between the joint and brick, as a percentage of the brick’s width; this gives a fuzzy
edge to the brick.
Checkerboard
This shader creates checkerboard patterns. Color 1 and Color 2 dene the colors of the two tiles.
U Frequency and V Frequency dene the size of tiling, i.e. the neness of the structure, in two
independent directions. Higher values result in smaller tiles. Enter unequal values, such as U=1 and
V=2, for rectangular tiles.
Cloud
To create Cirrus-like clouds, use different values for U and U, such as 0.25
and 1 respectively.