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.
The quality of being diligent; carefulness; careful attention; - the opposite of negligence. 2. Interested and persevering application; devoted and painstaking effort to accomplish what is undertaken; assiduity in service. That which ordinary men are fit for, I am qualified in; and the best of me is diligence.