The preliminary design of tension structures involves the determination of an initial configuration referred to as form finding.
\Pi = \sum_{j=1}^n D_j R_j^2 + \sum_{i=1}^3 \left(\sum_{k=1}^m C_{ik} \Delta X_{ik}^2 - \sum_{k=1}^m P_{ik} \Delta X_{ik}\right) .