At first a number is calculated and checked
if it's greater than or equals *0*. If this is the case, the variable
** C** is set to *1*, else to *0*. Example: Set
**C**=1 if 0<=X-0.5
This will make **C**=0 at the left half of the texture and
**C**=1
at the right part. Now we add at the second the third field: If 0<Y-0.5
Then **C**=1-**C**
The rule will invert **C** at the lower half of the
texture. If we leave the following fields empty, we will just receive a
simple checker board. More information can be found at the **
Rules** panel page. |