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.
diligence (plural diligences) 1  combination of carefulness and long-term effort (often used to refer to only one of these) 2  carefulness, for example due diligence. 3  long-term effort, working hard, the qualities of a hard worker, including conscientiousness, determination, and perseverance.  A public stage-coach.