R

Radiosity : The level of light reflected off of or scattered by light falling across surfaces. It is a natural occurence that object's surfaces do not absorb all light rays and so reflect some back into the surrounding area.
Render : The process of building a 2D image from the data contained in a 3D scene.
Resolution : This indicates the number of pixels per image. It is often represented in this format: where N and M are the number of pixels per column and row respectively.
RGB Color Model : The RGB (red, green, blue) color model describes a color as a positive combination of three appropriately defined red, green and blue primaries. They represents the additive color model, where 0% of each component yields black and 100% of each component yields white. Red, green and blue are the additive complements of cyan, magenta, and yellow respectively.
RGB True Color : An RGB color system with 24 bits per pixel color resolution. This gives a choice of over 16 million colors per pixel. Such a system is generally known as a true color or full color system.
Roll : The rotation of an object. Usually Left to right (tilting). Gives the illusion that your horizon is tilted.