A simple NURBS surfaces has been divided in a 10×10 grid, and then used as the reference geometry for a form-finding test. The four points at the corners have been constrained, and the simulation of an hanging model has been set up in both Karamba and Kangaroo. (Karamba, for instance, uses an incremental approach to handle geometrical non-linearity, and therefore to simulate hanging models).
The results of the two processes are shown below. (Karamba generated the fixed hanging model while the Kangaroo mesh has been overlapped later on). The two final geometries are almost coincident, and both tools can be used when a quick form-finding procedure is needed in conceptual design.