Your Wish is My Command

7.4 True Explicit PBD Solutions 155

After that, the system runs the remaining loops until the controlling ex-

pression fires. Each recurrence relation is evaluated from any loop. The re-

sult is given in Figure 7.7 (f). Finally, the user must define a symmetry of ev-

ery created circle (a native operation in CAD systems), which involves the

whole context of the iteration (any circle).

7o 4 True Explicit PBD Solutions

EBP provides for true explicit PBD solutions. In this section, we detail the

features of PBD. In the first subsection, we explain the specific commands

that have been added to the CAD system to make PBD