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 a variety of contexts, exogeny or exogeneity (from Greek exo, meaning outside, and gignomai, meaning to produce) is the fact of an action or object originating externally. It contrasts with endogeny or endogeneity, the fact of being influenced within a system.