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.
expedient - a means to an end; not necessarily a principled or ethical one. means, way, agency - how a result is obtained or an end is achieved; a means of control; an example is the best agency of instruction; the true way to success.