Editing Real-time computer graphics (section)

=== Advantages ===
[[File:FaceRig with full body.png|thumb|Real-time full body and [[face tracking]]]]

Real-time graphics are typically employed when interactivity (e.g., player feedback) is crucial. When real-time graphics are used in films, the director has complete control of what has to be drawn on each frame, which can sometimes involve lengthy decision-making. Teams of people are typically involved in the making of these decisions.

In real-time computer graphics, the user typically operates an input device to influence what is about to be drawn on the display. For example, when the user wants to move a character on the screen, the system updates the character's position before drawing the next frame. Usually, the display's response-time is far slower than the input device—this is justified by the immense difference between the (fast) response time of a human being's motion and the (slow) [[Persistence of vision|perspective speed of the human visual system]]. This difference has other effects too: because input devices must be very fast to keep up with human motion response, advancements in input devices (e.g., the current{{when|date=August 2019}} Wii remote) typically take much longer to achieve than comparable advancements in display devices.

Another important factor controlling real-time computer graphics is the combination of [[Game physics|physics]] and [[Computer animation|animation]]. These techniques largely dictate what is to be drawn on the screen—especially ''where'' to draw objects in the scene. These techniques help realistically imitate real world behavior (the [[Dimension#Time|temporal dimension]], not the [[Dimension|spatial dimensions]]), adding to the computer graphics' degree of realism.

Real-time previewing with [[graphics software]], especially when adjusting [[computer graphics lighting|lighting effects]], can increase work speed.<ref name="dili">{{cite book|url={{google books |plainurl=y |id=IRrsAQAAQBAJ|page=442}}|title=Digital Lighting and Rendering: Edition 3|last=Birn|first=Jeremy|publisher=New Riders|year=2013|isbn=9780133439175|page=442|access-date=24 September 2017}}</ref> Some parameter adjustments in [[fractal generating software]] may be made while viewing changes to the image in real time.