Building plans are to document planning assumptions and decisions, help with communication among project participants, and document approved scope, cost, and schedule. The level of detail for plans can vary.
Design is the process of creating a solution to defining requirements for the development of a building or home and then preparing instructions (Plans) allowing that solution to be constructed.
3D rendering is the 3D computer graphics process of converting 3D models into 2D images on a computer. 3D renders may include photorealistic effects or non-photorealistic styles.