Rhinoceros is primarily a free form surface modeler that utilizes the NURBS mathematical model. Rhinoceros' application architecture and open SDK makes it modular and enables the user to customize the interface and create custom commands and menus.
Noun. 1. exigency-a pressing or urgent situation; the health-care exigency. crisis-an unstable situation of extreme danger or difficulty; they went bankrupt during the economic crisis.
In computer science, persistence refers to the characteristic of state that outlives the process that created it.This is achieved in practice by storing the state as data in computer data storage.ersistence is said to be  orthogonal  or transparent when it is implemented as an intrinsic property of the execution environment of a program.