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.
Expedience \Ex*pedi*ence\, Expediency \Ex*pedi*en*cy\,, n. 1. The quality of being expedient or advantageous; fitness or suitableness to effect a purpose intended; adaptedness to self-interest; desirableness; advantage; advisability; -- sometimes contradistinguished from moral rectitude or principle. [1913 Webster] Divine wisdom discovers no expediency in vice. --Cogan.