Video rendering is the process of using computer programs to generate an image based on an existing object or model. It has uses in movie and TV visual effects, video games, architecture and design among other fields.
One method of video rendering starts with a process called pre-rendering, used frequently in computer animation and movies, where an outside source maps the outline and features of the model being rendered, then the main rendering software uses that data to create the finished product.
Real Time Rendering
With real time rendering, no outside source or model is used; the image is created by the main rendering software. Details, texture, shading and dimension are added as the image is developed in the virtual environment. This method is popular in video game manufacturing.
Images created by modern video rendering contain many photo-realistic features such as shading, texture, reflection, shadowing, motion blur, transparency and depth of field, creating a lifelike, fully animated subject.
The two main types of projection used in video rendering are orthographic, which presents a 3D model in a 2D space, and perspective projection, where the closer the camera is to the object, the larger it appears, similar to the way the human eye views objects.
Use in Movies
As computer graphic and rendering technology has evolved, animation and visual effects in movies have become immensely popular and increasingly lifelike, and allowed a wide range of films from “Jurassic Park” to “Lord of the Rings” to the Pixar films like “Toy Story” and “WALL-E” to exist and be produced on a manageable budget.